Which Swimming Pool Heat Pump Is Best for Inground Pools?

The Verdict, and the Basis for It

A successful pool heating system maintains a consistent temperature throughout the night without causing your electricity costs to spike. Achieving this requires a high COP (Coefficient of Performance), which measures how much heat a unit produces for every unit of electricity consumed.

The VARMINPOOL V35 Ultra Inverter Pool Heater handles large-scale heating demands, but you should choose the 100,000 BTU Full DC Inverter Pool Heat Pump if you prioritize a higher COP of 6.8. If you only need to maintain a small pool, the XKP2207BP 30,000 BTU Electric Pool Heater provides a more compact solution.

We selected these models after screening 29 Swimming Pool Heat Pumps at Refrigerant Recovery Pro, comparing 4 models in the table on this page. The options here range from $1499 to $3899.99, with a median price of $2499.

Find the ideal model for your specific needs in the audience checklist.

View our curated rankings in our top picks.

Learn how to select the right unit in the buying guide.

Pool Heat Pumps for Inground Pools: Price, Rating and Specs Compared

Prices are approximate and move frequently – check the current price before deciding. “Not stated” means the manufacturer listing does not give that figure – we do not estimate it.

Among our top picks, the VARMINPOOL V35 Ultra Inverter Pool Heater is the value leader because it provides 140,000 BTU of heating capacity at a rate of $0.03 per unit.

Each Pick for Inground Pools, Reviewed

The 3 picks below are reviewed in the same order as the cards above.

VARMINPOOL V35 Ultra Inverter Pool Heater

The VARMINPOOL V35 Ultra Inverter Pool Heater made this list because it provides the high-end heating capacity required for large-volume inground pools.

What we like: This model provides 140,000 BTU of heating capacity, which is sufficient to heat a 15,000 gallon pool at the easier end of the required power range. It features a full inverter system and a 330 3D coil evaporator to move heat into the water.

Keep in mind: The 140,000 BTU output may not provide enough power to heat a 15,000 gallon pool quickly during extreme cold, as it sits at the lower end of the recommended range.

100,000 BTU Full DC Inverter Pool Heat Pump

The 100,000 BTU Full DC Inverter Pool Heat Pump was selected for its high-efficiency DC inverter technology and its 6.8 COP (Coefficient of Performance), which measures the efficiency of heat produced relative to electricity consumed.

What we like: This unit achieves a COP of 6.8, which is at or above the 4.0+ efficiency benchmark where a unit produces 4 units of heat for every 1 unit of electricity. It also includes WiFi connectivity for remote monitoring and adjustment via smartphones.

Keep in mind: With a 100,000 BTU rating, this model provides enough power to heat a 15,000 gallon pool only at the easier end of the required range.

XKP2207BP 30,000 BTU Electric Pool Heater

The XKP2207BP 30,000 BTU Electric Pool Heater is included as the entry-level option for smaller inground pools or those with specific voltage requirements.

What we like: This heater features a titanium heat exchanger, a material known for resistance to corrosion and chemical degradation over time. It operates on a 120V power supply, making it compatible with standard household outlets.

Keep in mind: The 30,000 BTU heating capacity is not enough to heat a 15,000 gallon pool or maintain a large pool temperature overnight.

Which model is the best value for a standard-sized backyard pool?

The 100,000 BTU Full DC Inverter Pool Heat Pump is the best value for a standard-sized backyard pool because it balances high-efficiency 6.8 COP with a 100,000 BTU rating for a price of around $3,299. While the VARMINPOOL V35 Ultra Inverter Pool Heater offers more power at 140,000 BTU, the 100,000 BTU Full DC Inverter Pool Heat Pump provides the efficiency needed for standard volumes at a lower price point. The XKP2207BP 30,000 BTU Electric Pool Heater is a lower-cost alternative but lacks the BTU capacity to heat a standard 15,000 gallon pool.

Small pool owners can view the KSPF-005L3R1A1 Heat Pump analysis.

What Matters Most in a Swimming Pool Heat Pump for Inground Pools

BTU Capacity for Pool Volume

Select a heating capacity that meets your specific pool volume, as a unit that is too small will fail to raise the temperature during cold nights. For a 15,000 gallon inground pool, you need at least 100,000 to 150,000 BTU to ensure the water warms effectively; the VARMINPOOL V35 Ultra Inverter Pool Heater provides 140,000 BTU, while the 100,000 BTU Full DC Inverter Pool Heat Pump sits at the lower end of that required range. The XKP2207BP 30,000 BTU Electric Pool Heater provides 30,000 BTU, which is not enough to heat a 15,000 gallon pool. Choosing the right BTU is like picking a furnace for a house: a small heater in a large room never reaches the target temperature.

How high COP inverter efficiency ratings reduce electricity costs

Prioritize a high COP (Coefficient of Performance) to reduce electricity costs, as this measures how much heat the unit produces relative to the power it consumes. The 100,000 BTU Full DC Inverter Pool Heat Pump leads the group with a COP of 6.8, followed by the XKP2207BP 30,000 BTU Electric Pool Heater at 5.8. Both of these models sit at or above the 4.0+ COP efficiency benchmark where a unit produces 4 units of heat for every 1 unit of electricity. While the VARMINPOOL V35 Ultra Inverter Pool Heater uses a full inverter system, it does not state a specific COP figure in its data. High-end brands like Hayward or Jandy are the industry standard for parts availability and serviceability compared to white-label imports, but these inverter models provide the variable speed energy savings needed for modern efficiency.

How 47 dB noise levels balance high capacity output

These figures represent the sound produced by the fan and compressor during operation. Because noise levels are often a trade-off with high-capacity output, the 47 dB rating on the larger units helps maintain a quiet backyard while still providing high BTU output.

Electrical input requirements for 120V and 220V pool heaters

Confirm your available power supply before ordering, as these units require different voltages to operate. The XKP2207BP 30,000 BTU Electric Pool Heater runs on a 120V power supply, making it compatible with standard household outlets. You must ensure your electrical panel can support the specific voltage and amperage required by your chosen model before a qualified installer begins work. Proper flow rate is also a factor here, as it ensures the pump can move enough water for the heater to function.

Operating temperature ranges for heating and cooling pool modes

Verify the operating temperature range to ensure the unit can function in your local climate, as some heat pumps cannot start in extreme cold. The XKP2207BP 30,000 BTU Electric Pool Heater has a heating mode of 46F-104F and a cooling mode of 46F-82F. The VARMINPOOL V35 Ultra Inverter Pool Heater states an operating temperature of 5F, allowing it to function in much harsher conditions. Because the heat pump extracts heat from ambient air, the lower the ambient temperature, the harder the unit must work. Proper thermal insulation helps maintain the water temperature once the heat pump is turned off, reducing the frequency of cycles needed to stay warm.

Get answers to common questions in the FAQ.

Compare all models side by side in the comparison table.

Review installation details and coverage in the setup and warranty notes.

If you want different technologies, explore the alternatives to a pool heat pump.

Each Job, What It Takes and How the Picks Do

Each row is a job this page’s buyers ask about, worked out from each pick’s listed heating capacity and a typical need for the job.

Each need is a typical figure for that job rather than a manufacturer claim, and the picks’ results come from their listed specifications. Where your job is bigger or smaller than the typical one, go by your own figure.

Who Buys Pool Heat Pumps, and What It Really Costs

Understand the scope of this guide by viewing the article scope.

Check the necessary technical specs in the requirements section.

Explore the full analysis of each model in the detailed reviews.

Before the First Use, and After Delivery

Confirming electrical supply requirements before pool heat pump delivery

All three pool heat pumps require a 120V or 220V power source to operate. You must confirm your electrical supply matches the specific voltage requirements of your chosen model before the unit is delivered.

• The VARMINPOOL V35 Ultra Inverter Pool Heater and 100,000 BTU Full DC Inverter Pool Heat Pump both require 220V power and utilize an inverter compressor, which uses variable speeds to manage heat output.
• The XKP2207BP 30,000 BTU Electric Pool Heater runs on a standard 120V supply, making it compatible with common household outlets.
• The XKP2207BP 30,000 BTU Electric Pool Heater features a titanium heat exchanger, a material that resists corrosion from chemicals and minerals.

Verifying your order on arrival

Warranty coverage and return terms vary by seller and country, so check your specific purchase agreement immediately upon delivery.

• Confirm the unit’s weight and dimensions against the shipping manifest; the VARMINPOOL V35 Ultra Inverter Pool Heater weighs 275 pounds, and the 100,000 BTU Full DC Inverter Pool Heat Pump weighs 194.6 pounds.
• Check the exterior housing for any cracks or punctures in the UV-proof and waterproof casing, as these are difficult to repair once the unit is installed.
• Verify that the WiFi connectivity module is present if you plan to use the smart app control features included with the VARMINPOOL V35 Ultra Inverter Pool Heater, the 100,000 BTU Full DC Inverter Pool Heat Pump, and the XKP2207BP 30,000 BTU Electric Pool Heater.
• Ensure the 1.5 inch connectors on the XKP2207BP 30,000 BTU Electric Pool Heater match your existing PVC piping, which transports water from the pool to the heat pump.

Plug the unit into its power source and check the display for a successful WiFi connection while the return window is still open.

Saltwater and water chemistry compatibility

The XKP2207BP 30,000 BTU Electric Pool Heater is compatible with both freshwater and saltwater pools because it uses a titanium heat exchanger. Titanium resists the corrosive effects of the salt chemistry that can degrade other materials. The other models do not state specific saltwater compatibility, so you should confirm if their heat exchangers can withstand your specific chemical balance before purchase.

Questions Buyers Ask Before Choosing Pool Heat Pumps for Inground Pools

How much will my monthly electricity bill increase when I run the heater?

The increase in your monthly electricity bill depends on the COP (Coefficient of Performance), which measures the efficiency of heat produced relative to electricity consumed. The 100,000 BTU Full DC Inverter Pool Heat Pump provides a COP of 6.8, while the XKP2207BP 30,000 BTU Electric Pool Heater provides a COP of 5.8.

Does the heat pump work well in freezing temperatures or sub-zero climates?

Heat pump performance depends on the operating temperature, which is the minimum ambient air temperature the unit can extract heat from. The VARMINPOOL V35 Ultra Inverter Pool Heater states an operating temperature of 5F, while the data for the 100,000 BTU Full DC Inverter Pool Heat Pump and XKP2207BP 30,000 BTU Electric Pool Heater does not state this value.

Which pool heat pump should I buy for a 15,000 gallon inground pool?

If you need to heat a 15,000 gallon inground pool, you need a unit with a heating capacity of at least 100,000 to 150,000 BTU. The VARMINPOOL V35 Ultra Inverter Pool Heater provides 140,000 BTU, while the 100,000 BTU Full DC Inverter Pool Heat Pump provides 100,000 BTU, which is enough only at the easier end of that range.

Which pool heater is best for maintaining a large pool temperature overnight?

To maintain a large pool temperature overnight, you need a unit with a heating capacity of at least 80,000 to 120,000 BTU. The VARMINPOOL V35 Ultra Inverter Pool Heater provides 140,000 BTU, whereas the XKP2207BP 30,000 BTU Electric Pool Heater does not provide enough capacity for this task.

Who Should Skip These Swimming Pool Heat Pumps

If you require a heating system to heat a pool larger than 42,000 gallons or need a unit that provides industrial-grade output for commercial use, these three picks are the wrong tool. These models are sized for residential applications and do not reach the output levels required for large-scale commercial installations.

For those requiring high-volume industrial output or specialized commercial-grade heat pumps, you should look for units designed for commercial-grade industrial heat pumps. You can also find more specific configurations in our guide for best swimming pool heat pump for large pools.