A pool heat pump does one thing differently from every other pool heater on the market: it does not make heat, it moves heat. It pulls warmth out of the outdoor air and pushes that warmth into your water, which is why an electric pool heat pump uses roughly a quarter of the energy a gas heater would to deliver the same BTU. That single design decision shapes everything you need to know before buying, from how long a heat-up takes to what happens when the thermometer outside drops below 50 degrees.
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The problem is that pool heat pump listings bury that reality under marketing language. Every page claims huge capacity, nearly every page quotes a BTU figure measured on a warm day, and almost none of them tell you the honest number for a cold night. I spent weeks reading the specs, the manuals and the buyer comments across the current crop of units so you can compare the best pool heat pumps for inground pools on the numbers that actually predict whether your water will be swimmable in April and October.
Ten models made the cut. All of them are air-source heat pump pool heaters sized for inground pools, and the list spans the range from a compact 50000 BTU Raypak Crosswind for a small pool and attached spa to a 140000 BTU Hayward HeatPro and Varpoolfaye unit for pools north of 30000 gallons. Several add a cooling mode so you can pull the water down on a hot July afternoon, which matters more than most buyers expect. If you are still working out how much capacity your own pool needs, the sizing section below maps gallons to BTU before you commit to anything.
Before we get into the models, it helps to know what you are shopping for. If you want the broader picture on year-round pool heating, our guide to pool heat pumps for year-round swimming covers climate strategy in more detail, and our picks for variable speed pool pumps for inground pools matter a great deal here, because a heat pump can only move heat as fast as water flows past its heat exchanger.
Top 3 Best Pool Heat Pumps for Inground Pools (October 2026)
AQUASTRONG HEX100 15.8 COP Inverter
- 15.8 COP
- Heat 47-104F
- Cool 47-83F
- Auto defrost
- 3-year warranty
Best Pool Heat Pumps for Inground Pools in 2026
The table below is the short version of this roundup. Every model listed here is an air-source heat pump pool heater, and each one carries its own published BTU output, noise figure and warranty term. The BTU number is a rating measured under test conditions, not a guarantee in your backyard, so read the sizing section before you shop by capacity alone.
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What Is a Pool Heat Pump and How Does It Work?
A pool heat pump is an electrically powered swimming pool heater that captures heat from the surrounding air and transfers it into pool water instead of burning fuel, so it uses roughly a quarter of the energy a gas heater would to produce the same heat. A compressor moves refrigerant through an evaporator coil that absorbs ambient air heat, then releases that heat through a titanium heat exchanger into the water circulating through your pool plumbing, raising water temperature several degrees per day.
Three numbers decide how good any of these machines is in practice: BTU output, inverter efficiency, and heat exchanger material. BTU tells you how much heat the unit can move, COP tells you how many units of heat it produces per unit of electricity, and the exchanger material decides whether it survives a saltwater pool. Air temperature decides everything else, because a heat pump draws on the surrounding air, and below roughly 45 degrees Fahrenheit its output falls away sharply.
1. Varpoolfaye 120000 BTU Inverter Pool Heat Pump – the Best Overall Pick
Varpoolfaye 120,000 Btu Inverter Pool Heat Pump for Inground Pools 220V
120000 BTU heating
COP 12.3
Pools up to 33000 gal
47 dB
220V with WiFi
Pros
- Heats and cools in one unit
- Inverter variable speed compressor
- 47 dB quiet operation
- Saltwater and freshwater compatible
- WiFi app control
Cons
- WiFi app less capable than the on unit panel
- Factory water adapters can need resealing
- Heating speed is realistic rather than dramatic
This is the unit I would put on a 20000 gallon inground pool in a moderate climate. It pairs a 120000 BTU rated output with a COP of 12.3, which is a strong efficiency figure, and the manufacturer rates it for pools up to 33000 gallons. The variable speed inverter compressor is the reason it feels different from a fixed speed machine: instead of cycling on and off at full tilt, it modulates, and owners report a steady 3 degree delta-T while it runs.
Heat and cool is the feature that gets overlooked. One Florida owner reported keeping a pool in the low to mid 80s through the summer, which is not something a heating-only appliance can do. For most of the country the cooling mode gets used a few dozen times a year, but those few dozen days are exactly the days when a too-warm pool ruins a party.
Noise is the other thing that stands out. At 47 dB, owners describe it as inaudible over a 1.5 HP filter system, which matters because the unit lives on an equipment pad a short distance from a house. The physical footprint is 49 by 40 by 38 inches and the shipping weight is 238 pounds, so it is a two person lift with proper planning.
Two rough edges are worth knowing before you buy. The WiFi app handles temperature, schedules and modes, but several owners say it does less than the on-unit touch panel, so plan to use the panel as your primary control. Separately, the factory-installed water adapters can arrive loose and need resealing or extra sealant at first startup, which is a five minute fix with a wrench if you know to expect it.
How much heat do you get on a cold night
The 120000 BTU rating is measured under favorable conditions, and any owner in a cold climate will tell you the real number is lower. Owners also describe the heating speed as realistic rather than dramatic, meaning large temperature jumps in a few hours are not realistic in cold weather. Treat this as a unit that maintains and gently builds temperature rather than one that rescues a forgotten pool overnight.
If your pool sits in a region where spring arrives slowly, a cover becomes essential. A covered pool loses far less heat overnight, which means the same 120000 BTU rating produces a noticeably bigger rise per day.
Who should look elsewhere
Skip this one if you plan to heat a pool above 30000 gallons, where you will want more capacity than 120000 BTU delivers, or if you have no dedicated 220V circuit. It also draws through a 118 inch power cord at 220V, so plan the run to the pad before the unit arrives.
Buyers who want less app fuss should look at the Raypak 8450 further down, and buyers who want a cooling mode on a smaller budget should compare the AQUASTRONG HEX100.
2. VARMINPOOL 105000 BTU Heat and Cool Unit – the Most Versatile Performer
Pros
- Lowest noise figure in the list at 43 dB
- 105000 BTU suits full size residential pools
- Heating and cooling in one unit
- Touchscreen panel plus WiFi app and timer
- Weather resistant outdoor housing
Cons
- Heating speed varies with outdoor temperature and pool cover use
- Needs correct flow rate
- steady power and airflow clearance to hit rated output
At 43 dB this is the quietest published figure in our list, and for a 105000 BTU machine that is genuinely unusual. The housing is weather resistant and rated for permanent outdoor installation, and the footprint at 47.6 by 32.4 by 20.3 inches with a 176 pound weight is one of the more manageable large units here.
Control is the strongest part of this package. You get a touchscreen panel, a built-in timer and a WiFi app, so scheduling temperature holds is a two tap job from the patio chair. Buyers like that they are not forced to choose between a physical interface and phone control, which is exactly the trade-off that frustrates owners of some competing models.
It heats and cools in a single unit, which extends the usable season in both directions. In a hot summer climate that cooling mode can be the difference between a pool you use and a pool you avoid during the hottest weeks.
The honest caveat is the same one that applies to every heat pump. Heating speed depends heavily on outdoor temperature, circulation time and whether you use a pool cover, and reaching the rated output requires proper water flow rate, stable power and airflow clearance around the unit. None of that is the machine’s fault, but all of it is your responsibility on install day.
What 43 dB actually sounds like next to a house
At 43 dB the compressor sits below conversation level. On an equipment pad next to a bedroom wall, owners of comparable units report the pool pump itself is the louder sound. That makes this a strong pick if your pad is close to living space and you plan to run the heat pump overnight to hold temperature.
Low noise also means less throttling, because the unit does not have to cycle to manage a hot discharge. Combined with the inverter modulation, that supports longer run times at lower output, which is how heat pumps actually maintain temperature day to day.
Who should look elsewhere
Pass if you need a documented warranty term longer than 12 months, since this listing does not highlight one. Also pass if your pool is above 30000 gallons, as the manufacturer ceiling here is lower than the two 140000 BTU models in this roundup.
If your priority is a large, well-documented review history instead of the lowest noise figure, the AQUASTRONG HEX100 has over 500 ratings to draw on.
3. WARMBLU 28000 Gallon Inverter Pool Heat Pump – Best for the Lowest Running Cost
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WARMBLU 28,000 Gallons Inverter Pool Heat Pump for Inground Pools 220V
Up to 28000 gallons
COP up to 16.0
Pure titanium exchanger
Sub-50 dB
220V
Pros
- Highest COP figure in the list at up to 16.0
- Pure titanium heat exchanger resists corrosion
- One owner measured about 1300 watts and under 19 per month
- Sub-50 dB and quietest on inverter modulation
- Supportive service that will size match a unit
Cons
- Needs careful flow regulation or condensation gets heavy
- Smart Life app pairing is fiddly
- Small number of early failures reported
COP is the number that drives your electric bill, and this unit publishes the highest one in the group at up to 16.0. It uses a pure titanium heat exchanger inside what the company calls the SpringBreath 1.0 heating system, with an inverter chip and a dynamic algorithm holding output steady rather than surging.
Owners report the fastest real-world heating in this roundup, with several describing water gains of more than 20 degrees in about 24 hours. One owner measured roughly 1300 watts of draw and put the monthly cost under 19 dollars at their local rate, which is the sort of number that changes the conversation when a neighbor asks whether a heat pump is worth it.
Noise sits below 50 dB, and owners specifically praise how quiet it gets on inverter modulation rather than at full output. Heating and cooling both work in the same cabinet, which several Florida buyers called out as more useful than they expected during summer months.
Two setup details decide whether you get those results. Owners repeatedly advise adding 3-way valves and a discharge valve to manage flow, because too much flow reduces heat transfer and produces heavy condensation. The Smart Life app pairing is also fiddly, since the unit creates its own network rather than joining your existing one, and it takes patience.
Is a 16.0 COP realistic or a lab number
Treat COP as a best-case rating, the way you would treat any efficiency figure. Your own result depends on ambient temperature, sun exposure, cover use and flow rate. Even so, a unit rated this high has more headroom when conditions are mediocre, which is exactly when a lower COP unit falls short.
Corrosion resistance is the other reason to like the titanium exchanger. On a saltwater pool, or a freshwater pool with heavy chlorination, the material of the exchanger matters more than any other component for service life.
Who should look elsewhere
Do not buy this one expecting a long warranty story. The listed term is 12 months, the shortest published coverage among the titanium-exchanger units here, and a small number of owners report units failing soon after installation or as replacements.
Owners who want a three-year term should look at the AQUASTRONG HEX100, and anyone needing more than 28000 gallons of rated capacity should step up to a 140000 BTU model.
4. Hayward HeatPro 140000 BTU Titanium Heat Pump – Best for Saltwater and Coastal Pools
Hayward HeatPro Pool Water Heat Pump Heater for Inground Pools, 140,000 BTU
140000 BTU
Titanium heat exchanger
Ultra Gold coastal tech
320 pounds
Pros
- Titanium exchanger resists salt water and pool chemistry
- Ultra Gold corrosion technology for coastal climates
- Hayward is an 80 year established pool equipment brand
- UV resistant impervious body panels
- Economical to run versus propane or gas
Cons
- Highest cost in this group by a wide margin
- 320 pounds makes handling and placement a planning job
- Heating focused with no cooling mode in the feature set
This is the name brand option, and for a saltwater pool in a coastal market it is the safest pick on the list. The titanium heat exchanger is built for maximum heat transfer and resistance to salt water and harsh pool chemistry, and the Ultra Gold corrosion-resistant technology was developed specifically for coastal climates where airborne salt attacks outdoor equipment.
At 140000 BTU it is sized for large, regularly used inground pools, and Hayward is an 80-year pool equipment manufacturer with a parts and dealer network that a direct-import brand simply does not have. When a compressor fails at 7 a.m. in July, that network is worth more than a spec sheet line.
Owners also note the running economics favorably. Air-source heating is more economical to operate than propane, gas or conventional electric heating, and the unit is designed specifically for regularly used in-ground pools rather than being an adapted spa product.
The trade-offs are physical and financial. It is the heaviest name-brand option here at 320 pounds with a 40 by 31.5 by 50 inch footprint, so delivery to the pad and setting it in place take planning. The 4.1 average rating also trails the direct-import competitors, with 14 percent of ratings landing at one star, and there is no cooling mode in the feature set.
Why titanium matters more than you think
A salt water chlorine generator raises the chloride content of pool water well above what plain copper exchangers tolerate. Over time that shows up as pitting, leaking joints and a shortened service life, and the fix is a metal sequestrant or a full exchanger replacement. A titanium exchanger largely removes that failure mode from the equation.
The UV-resistant, impervious body panels add a second layer of protection for coastal installs where summer sun and salt air both work on cabinetry and fasteners.
Who should look elsewhere
Price sensitivity is the main reason to pass. This is the most expensive unit in the roundup, and you are paying partly for the brand, partly for corrosion hardware and partly for dealer support rather than for extra heating capacity.
On a freshwater pool in a mild inland climate, the 140000 BTU capacity is more than most families need, and one of the direct-import inverter units will heat the same water for a fraction of the outlay.
5. AQUASTRONG HEX100 15.8 COP Inverter Heat Pump – Best Value with the Biggest Review Base
Swimming Pool Heater for Above Ground and Inground Pool 20’*43’*48″
15.8 COP
Heating 47-104F
Cooling 47-83F
55 dB
3 year warranty
Pros
- Over 500 ratings give the deepest field history here
- Heating within hours rather than days per multiple owners
- 15.8 COP with full DC variable frequency inverter
- Short automatic defrost cycles every 40 minutes
- Three connection options fit most existing plumbing
- Under 120 pounds so it is easy to reposition
Cons
- 55 dB is louder than the premium models
- Small share report frequent cycling or weak cold weather output
- App control needs a smartphone and WiFi pairing
With more than 500 ratings this unit has by far the deepest field history in the roundup, and a number label to match: it holds the number one Best Sellers Rank position in the Swimming Pool Heat Pumps category. Review volume is not quality, but it does mean fewer surprises.
Technically it is a full DC variable frequency inverter unit rated at 15.8 COP, with an adaptive frequency conversion algorithm adjusting power in real time. It heats water from 47 to 104 degrees Fahrenheit and cools from 47 to 83, so it works year round in most of the country.
The cold weather story is the standout feature. It runs an automatic defrost cycle every 40 minutes that completes in about 5 minutes, so the evaporator does not spend long iced over. Owners describe those cycles as short and largely invisible, which is what allows continuous cold weather heating instead of long stop-start periods.
Installation is friendly too. Three connection options are included: a 1.25 or 1.5 inch hose adapter, a 1.5 inch adapter conversion kit and a 1.5 inch PVC pipe converter, so it will likely mate with whatever plumbing you already have. At 116.8 pounds it is the lightest large unit here and easy to reposition.
Where the 55 dB shows up
Fan and compressor noise is more noticeable than on the premium models, and buyers comparing units in the same price bracket notice it. If the pad sits beside a bedroom or a patio dining area, pay attention to this. If the pad is a reasonable distance from living space, most owners never think about it.
There is also a small share of buyers reporting units that cycle frequently or underperform in sustained cold, which points again at sizing and flow rate as the deciding factor. Confirm the pump can deliver the required flow before you finalize the purchase.
Who should look elsewhere
This is not the choice for someone who wants the quietest operation on the pad, since 55 dB is the highest published figure among the large units here. Nor is it the pick for a pool above roughly 25000 gallons, as its stated output caps at about 104000 BTU.
For very large pools, the Varpoolfaye 140000 BTU model covers up to 42000 gallons. For pure quiet, the VARMINPOOL unit runs at 43 dB.
6. MICOE 100000 BTU Inverter Pool Heat Pump – Best for Small and Mid Size Pools
MICOE 100,000 BTU Inverter Pool Heat Pump for 26,000 Gallon Pools
100000 BTU
Up to 26000 gallons
Heating 46-104F and cooling 45-82F
54 dB(A)
Pros
- Fast heating with 20 degree gains in 48 hours at 60F weather
- Reverses into cooling mode
- Very quiet compared with an older 120000 BTU unit
- App setup is simple and ties into existing pool controls
- Titanium heat exchanger and IPX4 UV resistant cabinet
Cons
- Wiring diagrams are confusing
- Needs a 50 amp breaker and waterproof conduit
- Terminal connections look small for the recommended 6 gauge wire
- Some units need several days of running on cool nights
For a pool in the 14000 to 20000 gallon range, 100000 BTU is usually the right capacity and this unit is built around it. Owners report water gains of more than 20 degrees in 48 hours in 60 degree weather, which is faster than most owners expect from a heat pump and much faster than the days-long waits described in owner forums.
It heats from 46 to 104 degrees and cools from 45 to 82, with a variable speed system and automatic defrost for cooler conditions. Several buyers did not expect a pool heater to reverse into cooling mode at all, and treat it as a pleasant surprise.
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Support is a genuine strength. Owners describe pre-sale and post-sale responsiveness that includes shipping a grounding part unprompted, plus 24/7 live chat. At 54 dB(A) it is quiet in absolute terms and notably quieter than the 120000 BTU unit one buyer replaced.
The recurring complaint is installation documentation. Wiring diagrams are confusing, a 50 amp breaker and waterproof conduit are required, and the supplied terminal connections look undersized for the recommended 6 gauge wire. Budget time for an electrician rather than assuming the diagram tells you everything.
How the app fits with your existing equipment
The app setup is simple and the unit ties into existing pool control boxes, which is unusual at this level. If you already run your pump and lights through an automation system, this is one of the easier heaters to bring into the same routine rather than managing separately.
The removable wired remote is not built for daily handling, so owners end up using the app for everything. Set expectations on that before you install it, or you will be unsnapping a wired control ten times a day.
Who should look elsewhere
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Two-year parts replacement coverage is shorter than the three years offered by the AQUASTRONG, and the 4.1 average rating comes with 14 percent one-star responses. If your install is going to be complicated, pick a unit with clearer documentation and a longer term.
Pools above 26000 gallons are out of range here. The titanium exchanger is rated for freshwater, so saltwater owners should look at a unit explicitly listed as saltwater compatible.
7. Varpoolfaye 140000 BTU Pool Heat Pump – Best for Very Large Pools
Varpoolfaye 140000BTU Swimming Pool Heat Pumps Up to 42000 Gallons 220v
140000 BTU
COP 12.8
Pools up to 42000 gallons
47 dB
337 pounds
Pros
- 4.7 average rating with no one star reviews reported
- 140000 BTU for pools up to 42000 gallons
- 47 dB for a unit this size
- Works in both freshwater and saltwater installations
- Heating and cooling capability
Cons
- Heaviest direct-import unit at 337 pounds
- Listing copy mixes above ground and inground marketing
- Condensate draining needs planning on the pad
This is the capacity ceiling of the roundup at 140000 BTU, rated for pools up to 42000 gallons. Owners of 150000 BTU ceiling heat pumps consistently describe that number as a practical upper limit for the category, so this unit sits right at the top of what the technology can do and no further.
The 4.7 average rating comes with 81 percent five-star responses and no reported one-star ratings, which is the cleanest distribution in the group. The sample is small at 59 ratings, so read it as a promising signal rather than a proven track record across many seasons.
Heat and cooling are both present, the COP is 12.8, and the unit runs at 47 dB. Freshwater and saltwater compatibility means it drops into a coastal install without hesitation. Control is via a WiFi app for temperature, scheduling and modes, with 1.5 inch connectors and 220V power.
The practical issue is weight. At 337 pounds this is the heaviest direct-import unit in the roundup, and a multi-person lift or mechanical equipment is needed to set it on the pad. Condensate draining from the bottom of the unit also needs planning, since a saturated pad in spring is a problem waiting to happen.
Is 42000 gallons realistic for one heat pump
That figure is a rated maximum under favorable conditions, not a daily operating reality. Owners repeatedly note that heat pumps top out around 150000 BTU in practice, so very large pools are usually heated with a heat pump for daily maintenance plus a gas heater for a rapid warm-up before a party or an opening weekend.
If your pool is 30000 gallons or more, plan the system rather than the appliance. A heat pump that holds temperature steadily and a gas unit that handles the surge is a common and sensible pairing.
Who should look elsewhere
Do not buy a 140000 BTU unit for a 15000 gallon pool. You will pay for capacity you cannot use, run the compressor harder than necessary for no benefit, and still get a slower heat-up because the extra capacity does not speed up heat transfer.
Anyone who cannot arrange a heavy lift should look at the AQUASTRONG HEX100 at under 120 pounds, or the Raypak Crosswind at 135 pounds.
8. Raypak 8450 140K BTU Titanium Heat Pump – Best for Heavy Duty Installations
Raypak Heat Pump 8450 Model with Titanium Heat Exchanger, 140K BTU TWPH-8450EHT08
140000 BTU
Spiral titanium tube exchanger
Scroll compressor
422 pounds
Pros
- Commercial grade louvered steel cabinet built like an air conditioner
- Spiral titanium tube resists pool chemistry and scale
- Scroll compressor runs quieter and more efficiently
- Off set 2 inch PVC union connections simplify hookup
Cons
- Heaviest unit in the roundup at 422 pounds
- Smallest review base of the named brand units
- Costs well above the direct import models
The Raypak 8450 is built to a different standard than everything else here. The cabinet is powder-coated steel with a fully louvered steel jacket that protects the evaporator coil from hail, storm debris and harsh weather, and the base is a rust-proof composite chosen for sound deadening and longevity. Pool builders describe it as the machine you spec when the equipment pad will not be serviced for years.
Internally, a scroll compressor provides quiet, efficient and durable operation compared with older piston designs, and the heat exchanger uses spiral titanium tube in a scoop-and-lift arrangement that actively reduces deposit build-up. That deposit resistance is the reason titanium units outlast copper ones in heavily chlorinated water.
Plumbing is straightforward with off-set 2-inch PVC union connections, which is a real convenience if your existing lines are already 2 inch. The unit is 44 by 30 by 29.99 inches and rated at 140000 BTU for large inground pools.
The tradeoff is weight and price. At 422 pounds this is the heaviest unit in the roundup, and professional placement is not optional. With 24 ratings the long-term field history here is thin, which is expected for a contractor-oriented specialist model rather than a high volume consumer listing.
Steel and coil protection on a coastal pad
The louvered jacket is not cosmetic. It shields the evaporator coil from hail strikes and storm debris, both of which are common causes of coil damage that turn an otherwise repairable unit into a replacement. On a coastal install, the powder coating and composite base also slow the corrosion that eventually eats lighter cabinets.
Sound deadening matters too, because a steel cabinet resonates. The composite base and the scroll compressor together are why owners of comparable Raypak builds describe the machine as quiet relative to its output.
Who should look elsewhere
This is a contractor-grade pick. If you are a homeowner doing a straightforward replacement on a 15000 gallon pool, you are paying for construction you will never see and weight you will struggle to move.
The Gulfstream HE150 is the alternative if you want large capacity with US-based service, and the Hayward HeatPro if the priority is corrosion resistance in salt air.
9. Gulfstream HE150 136000 BTU Pool Heat Pump – Best for U.S. Based Service and Support
Gulfstream POOL HEAT PUMP HE150 136,000 BTU’S
136000 BTU
Copper heat exchanger
Electronic controls
Optional WiFi kit
Pros
- US based manufacturer and dealer network
- One owner raised a 36000 gallon gunite pool 10 degrees in about 24 hours
- Boards and WiFi modules replaced free of charge by the dealer
- Little noticeable change to electricity use while heating
- Easy electronic controls and straightforward plumbing
Cons
- Copper exchanger can leach copper and turn water green on first use
- WiFi kit is a separate add on
- Access panel fasteners and factory holes do not line up
The reason to buy Gulfstream is service, not specs. This is a US-based manufacturer with an in-country dealer network, and owners report having boards and WiFi modules replaced free of charge. One owner took a 36000 gallon gunite pool from 66 to 76 degrees in about 24 hours in a heavily shaded yard, and another took a 10000 gallon inground pool from 72 to 85 degrees overnight.
At 136000 BTU it is designed for full size inground pools including gunite and fiberglass liner construction, and the electronic controls have a straightforward interface. It is rated for both residential and commercial applications.
Owners also report little noticeable change to their electricity use despite steady heating, which tracks with how a heat pump moves heat rather than generating it.
Two cautions. The copper heat exchanger can leach copper into the water on first use, which reacts with chlorine and turns the water green until a metal sequestrant resolves it. The WiFi module is an optional add-on kit, not included, and the access panel uses cheap pins with factory holes that do not line up, making the cover awkward to refit.
When copper is the wrong choice
Copper exchangers are cheaper and they do move heat well, but on a salt water pool with a chlorine generator, or on any pool running heavy chlorination, copper is the first component that gives up. The leaching problem is not a defect exactly, it is chemistry, and it shows up as green water in the first weeks of service.
For a saltwater pool, pick titanium and skip this. For a freshwater pool with a metal sequestrant in the plan, copper is workable and the initial green tint is a five dollar bottle of sequestrant.
Who should look elsewhere
Skip the WiFi-dependent control story if remote control matters to you, since the module costs extra and is not in the box. And if you want a published warranty length or a long list of features, this listing offers less detail than the inverter units.
Owners chasing a feature list should compare the AQUASTRONG HEX100, which lists a three-year warranty and app control out of the box.
10. Raypak Crosswind 50000 BTU Pool and Spa Heat Pump – Best for Spas and Small Pools
Raypak Crosswind Horizontal Discharge 50k BTU Pool & Spa Heat Pump – 1.28 kW (017740)
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50000 BTU at 1.28 kW
Inverter compressor
135 pounds
Horizontal discharge
Pros
- Extremely quiet
- with the pool pump louder than the heat pump
- Draws roughly 1 to 2 kW
- Added 10 to 12 degrees overnight on a 21 foot pool
- Compact at 135 pounds and easy to install
- Works for both pools and spas
Cons
- No native app
- control relies on the front panel or third party apps
- Runs only while the pool pump runs
- Port adapters may not be in the box
- Case can discolor over winter
Not every inground pool needs 100000 BTU. For a pool in the 7500 to 10000 gallon range, or for a swim spa, the Raypak Crosswind is the size that matches the job, and its 4.7 rating across 18 ratings sits at the top of the range in this roundup.
The inverter compressor pairs with a low-speed fan motor for what owners describe as whisper quiet operation, often quieter than the pool pump itself. Efficiency is the other headline: the unit draws roughly 1 to 2 kW, which is remarkably low for a 50000 BTU machine and is why it is a favorite for holding a spa at temperature around the clock.
Heating results in the field are strong. One owner raised a 7500 gallon pool from 62 to 84 degrees in 24 hours at season opening, and another added 10 to 12 degrees overnight on a 21 foot round pool with about 5 hours of run time per day.
What the horizontal discharge changes
The horizontal discharge configuration sends air sideways rather than straight up, which matters on a tight pad where an upward discharge would put the outlet over a wall or a fence line. The user-friendly interface shows easy to read diagnostics, and the unit works with third-party smart home integrations.
At 135 pounds and 39 by 12 by 26 inches it is the easiest unit here to install, and supplied union fittings keep the hookup simple. Confirm with your installer that the adapters which fit the supplied ports to standard fittings are included, since one buyer had a pool store report them missing.
Who should look elsewhere
There is no native app. Control runs through the front panel or a third-party generalized app, and the unit only runs while the pool pump is running because it has no internal pump of its own, so pump run time becomes your heating schedule.
Anyone with a pool above 12000 gallons should step up a size. And if you leave the pool open through winter, add a cover, since the case can discolor over winter and a cover costs less than a replacement panel.
How to Size a Pool Heat Pump for Your Inground Pool
Size by heat load, not by pool size alone, because a shaded yard in New England and a sunlit yard in Houston have the same gallons and completely different losses. The rule of thumb most pool professionals use is roughly 100000 BTU per 10000 gallons, adjusted for cover use and climate.
Here are the thresholds most manufacturers and pool retailers quote: pools under 10000 gallons need about 60000 BTU, pools up to 15000 gallons need roughly 90000 BTU, and pools of 25000 gallons or more need 120000 to 140000 BTU. Between 15000 and 25000 gallons, plan on 100000 to 120000 BTU.
Two corrections to those numbers. If you have no cover, add 20 to 30 percent to the calculated figure, because uncovered water loses heat roughly overnight through evaporation. And remember the practical ceiling: heat pumps top out around 150000 BTU, so very large pools need a paired gas heater for rapid warm-up rather than a bigger heat pump.
Flow rate matters as much as BTU. If your circulation pump cannot move enough water through the heat exchanger, you will get poor heat transfer and heavy condensation regardless of the rating on the box. Owners repeatedly recommend adding 3-way valves and a discharge valve to regulate flow. Our guide to pool pumps is worth a read before you finalize the sizing.
Inverter vs Fixed Speed Compressors – Why It Matters
A fixed speed compressor runs at full output or not at all, which means it cycles on and off. Every start costs you a surge of electricity, every cycle cycles your water temperature up and down, and repeated cycling is hard on the compressor over a decade of service.
An inverter compressor, also called a variable capacity unit, modulates its output to match demand. It runs continuously at low power holding temperature, which is exactly how heat pumps are meant to be used. Nine of the ten models in this roundup use inverter technology, and the COP figures on those units range from 12.3 up to 16.0.
The practical benefits are lower energy use, quieter running at part load, and longer life. The tradeoff is price and the fact that a modulating unit’s rated BTU is harder to realize in a stiff breeze. Ask any dealer whether the BTU number is measured at 75 degree ambient air, because that single fact explains most of the disappointment reported in owner forums.
Cold Climate and Freeze Protection Performance
Here is the honest limit: pool heat pumps operate correctly only down to roughly 45 degrees Fahrenheit, below which efficiency and output degrade sharply. A unit rated at 120000 BTU may deliver a fraction of that on a 35 degree night, and no amount of premium hardware changes the physics of a cold evaporator coil.
Freeze protection is a different question from heating. Owners in moderate climates frequently report successfully maintaining a 5 to 6 degree temperature advantage over an unheated pool at much lower cost, which is a season-extending tool rather than a winter survival tool. New England and upper Midwest owners are repeatedly advised that a heat pump alone will not hold temperature in freezing conditions.
The failure case worth knowing about comes from owner forums: one saltwater owner in central North Carolina with a 21000 gallon pool and no cover ran the pump and a bubbler through a two-week freeze and still ended up with a half-inch ice island stretching from the shallow end wall to a third of the pool length. Ice forms on the surface and on plaster walls long before it forms in the middle of the pool.
More Top Picks Construction
If you are in a climate that sees hard freezes, buy the largest unit you can justify, keep a solar cover on the pool, and treat freeze protection as a separate winter project involving a heater or an air blower rather than an expectation you place on the heat pump.
Saltwater Compatibility and Heat Exchanger Materials
Saltwater is the single biggest factor in how long a pool heat pump lasts. A salt water chlorine generator pushes chloride content well above what plain copper tolerates, and the exchanger is the first component to show it through pitting and leaking connections.
Titanium is the answer for any salt pool. Five models here use a titanium or spiral titanium tube exchanger, including the Hayward HeatPro with its Ultra Gold coastal technology, the WARMBLU with a pure titanium exchanger, and the Raypak 8450 whose spiral tube arrangement resists both harsh chemistry and deposit build-up. Two units are explicitly listed as compatible with both freshwater and saltwater, which is the clearest labeling you will find.
Copper exchangers, like the one on the Gulfstream HE150, are fine on freshwater with a metal sequestrant on hand. The owner reports are consistent: green water in the first weeks, resolved with sequestrant, and ongoing concern in a salt system.
Installation and Electrical Requirements
Every unit in this roundup needs a dedicated 208 to 230V single-phase circuit at 50 to 60 amps. That is not a small electrical project, and it is the item most likely to blow up a budget, because many existing equipment pads do not have a spare 60 amp breaker space available.
Budget for a panel upgrade if your panel is full, and ask your electrician to confirm the breaker size, the wire gauge and the conduit run before the unit ships. The MICOE listing illustrates the documentation gap well: owners report confusing wiring diagrams and terminal connections that look small for the recommended 6 gauge wire, so a licensed electrician is the right call rather than a shortcut.
Two more installation details. These machines weigh between 117 and 422 pounds, so plan the lift onto the pad. And condensate drains from the bottom of the unit, so give it somewhere to go that is not a puddle on your pad in April.
Because a heat pump is a closed loop that needs water moving through it, your circulation pump and filter setup matter as much as the appliance. Keeping your filtration and circulation equipment in good shape is covered in our variable speed pool pump guide, and a clean filter is the cheapest heat transfer improvement available.
How to Cut Running Costs and Heat Pump vs Gas Heater
In moderate to warm climates, heat pumps save roughly 70 to 80 percent in operating costs compared with gas heaters, because they move heat rather than generate it. One owner in this roundup measured roughly 1300 watts of draw and put the monthly cost under 19 dollars, and the AQUASTRONG claims 70 percent savings over electric resistance heating and 40 percent higher efficiency than gas systems.
The trade-off is time. A gas heater can raise a 20000 gallon pool 10 degrees overnight; a heat pump may take a full day, and owners report as long as a week in midwinter. If you swim every day and want water ready when you get home, a heat pump holds beautifully. If you swim twice a month and want a hot pool on demand, the fuel cost economics change.
Five moves cut the bill further, in order of return: put a solar cover on the pool, run the unit overnight when ambient air is coolest, size correctly so it never runs flat out chasing an impossible target, keep the filter clean so flow stays up, and set a realistic target temperature rather than chasing pool-and-spa temperatures every day.
If you want help keeping the pool itself in good shape while the heat pump does its work, our picks for premium robotic pool cleaners cover the other half of low-effort ownership.
Frequently Asked Questions
Which brand of pool heat pump is the most reliable?
Reliability tracks the compressor type and the heat exchanger material more than the badge. Inverter compressor units with titanium or spiral titanium heat exchangers last longest, and the established names in the category include Hayward and Raypak for their dealer and parts networks. Among the models reviewed here, the AQUASTRONG HEX100 has the deepest field history with more than 500 ratings, and the Hayward HeatPro wins on corrosion resistance and service reach.
What size heat pump do I need for my inground pool?
Roughly 100000 BTU per 10000 gallons is the common starting point. Pools under 10000 gallons need about 60000 BTU, pools up to 15000 gallons need around 90000 BTU, and pools of 25000 gallons or more need 120000 to 140000 BTU. Add 20 to 30 percent if you run no cover, and remember that heat pumps top out around 150000 BTU in practice.
Are heat pumps for pools worth it?
For maintaining temperature on a daily basis, yes. A heat pump uses roughly a quarter of the energy a gas heater would for the same heat, and in moderate to warm climates it cuts operating costs by about 70 to 80 percent. The tradeoff is speed, since a gas heater can raise a large pool 10 degrees overnight while a heat pump may take a full day.
What are the downsides of using a pool heat pump?
Three matter most. First, output falls off sharply below about 45 degrees Fahrenheit ambient. Second, heat-up time is slow, and owners report waiting days or even a week in midwinter. Third, it will not stop a pool from freezing in a hard freeze, so cold climates need a separate freeze plan. A fourth practical issue is the need for a dedicated 208 to 230V circuit at 50 to 60 amps.
Can a pool heat pump heat a pool in cold weather?
It can, but not efficiently. Pool heat pumps operate correctly only down to roughly 45 degrees Fahrenheit, and below that efficiency and output degrade sharply. Above that threshold an inverter unit with a short defrost cycle can heat continuously through a normal winter, but a heat pump alone will not hold temperature in freezing conditions.
Do pool heat pumps work with saltwater pools?
Yes, provided the heat exchanger material suits salt water. A salt water chlorine generator raises chloride levels well beyond what plain copper tolerates, so choose a titanium or spiral titanium exchanger for any salt pool. Five of the models reviewed here use titanium exchangers, and two are explicitly labeled for both freshwater and saltwater installations.
How much electricity does a pool heat pump use?
It depends on capacity and COP. A 50000 BTU unit with an inverter compressor can draw roughly 1 to 2 kW, while a 120000 BTU unit measured by one owner pulled about 1300 watts of real draw. Units rated between 12.3 and 16.0 COP deliver more heat per unit of electricity, which is why COP matters as much as the BTU rating when you compare models.
Is a heat pump better than a gas heater for a pool?
Choose a heat pump if you want low daily running costs and steady temperature maintenance, and a gas heater if you want fast on-demand heat and live in a climate that drops below 45 degrees Fahrenheit. Many owners run both, using the heat pump for daily holding and the gas unit for a quick warm-up before guests arrive.
Conclusion: The Best Pool Heat Pumps for Inground Pools
For most inground pools between 15000 and 20000 gallons, the Varpoolfaye 120000 BTU inverter is the pick. It has the most balanced combination of capacity, a 12.3 COP, 47 dB operation, a heating and cooling mode and saltwater compatibility, backed by 147 ratings.
Smaller pools and swim spas should look at the Raypak Crosswind at 50000 BTU, which is quiet, extremely efficient and rated 4.7 by its owners. The AQUASTRONG HEX100 is the value choice with the deepest review history and a three-year warranty. Saltwater and coastal installs belong on the Hayward HeatPro or the Raypak 8450 for titanium construction and dealer support, and pools above 25000 gallons need a 140000 BTU unit with a gas heater as a companion for fast warm-ups.
Before you buy, confirm three things: your gallons, your coldest typical night, and whether your electrical panel has a spare 50 to 60 amp breaker. Get those right and the best pool heat pumps for inground pools will hold your water exactly where you want it for a fraction of what a gas heater costs to run.