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Pool Heaters for Inground Pools

Best Inground Pool Heaters - Heat Pumps and Gas Heaters for All Pool Sizes

This collection covers both electric heat pumps and gas heaters for in-ground pools. Heat pumps pull heat from the surrounding air and are the lower operating cost choice for pools used regularly in warm climates. Gas heaters burn propane or natural gas to generate heat instantly at full output regardless of air temperature - the right choice for pools that sit unused for stretches, cold climates, large pools, or spa setups where fast recovery matters. Use the table below to find the right unit for your pool size, then scroll down to browse all products.

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Inground Pool Heaters - Full Lineup by Pool Size

Pool Size Unit BTUs Type / Mode Price
Up to 7,500 gal Madimack InverECO 32K 32,000 Heat/Cool Inverter $2,110
Up to 10,000 gal Madimack InverECO 40K 40,000 Heat/Cool Inverter $2,450
Up to 12,000 gal Madimack InverECO 50K 50,000 Heat/Cool Inverter $2,680
Hayward HeatPro 50K 50,000 Heat/Cool $2,999
Up to 15,000 gal FibroPool FH270 70,000 Heat/Cool from $1,935
AquaCal T70 TropiCal 63,000 Heat/Cool Inverter $3,311
Madimack InverECO 66K 66,000 Heat/Cool Inverter $3,115
Up to 17,500 gal FibroPool FH285-i 85,000 Heat/Cool Inverter from $2,386
Up to 20,000 gal Hayward HeatPro 100K 100,000 Heat/Cool $5,499
GulfStream HE110 RA 115,000 Heat Only $3,895
GulfStream HE125 TA 118,000 Heat/Cool $4,695
Madimack InverTitan 90K 90,000 Heat/Cool Inverter $5,000
Up to 23,000 gal GulfStream HE125 RA 125,000 Heat Only $4,095
Up to 25,000 gal Hayward HeatPro 140K 140,000 Heat Only $6,999
AquaCal SQ140R 114,000 Heat/Cool Inverter $4,652
AquaCal SQ145 121,000 Heat Only $5,435
AquaCal T100 TropiCal 108,000 Heat/Cool Inverter $4,770
Madimack InverELITE 84K 84,000 Heat/Cool Inverter $6,230
Hayward H150 (Natural Gas) 150,000 Gas Heat Only $2,999
Hayward H150 (Propane) 150,000 Gas Heat Only $2,999
Up to 27,000 gal GulfStream HE150 RA 142,000 Heat Only $4,495
Up to 30,000 gal AquaCal T130 TropiCal 123,000 Heat/Cool Inverter $5,519
GulfStream HE150 TA 137,000 Heat/Cool $5,095
Over 30,000 gal AquaCal SQ160R 128,000 Heat/Cool Inverter $5,316
AquaCal SQ200R 138,000 Heat/Cool Inverter $6,450
Madimack InverELITE 116K 116,000 Heat/Cool Inverter $6,900
Madimack InverTitan 112K 112,000 Heat/Cool Inverter $5,790
Hayward H200 (Natural Gas) 200,000 Gas Heat Only $3,699
Hayward H200 (Propane) 200,000 Gas Heat Only $3,699
Hayward H250 (Natural Gas) 250,000 Gas Heat Only $3,999
Hayward H250 (Propane) 250,000 Gas Heat Only $3,999
Up to 80,000 gal Hayward H400 (Natural Gas) 400,000 Gas Heat Only $5,099
Hayward H400 (Propane) 400,000 Gas Heat Only $5,099

Heat pump units require a dedicated 220-240V circuit - no gas line needed. Gas heaters require a gas line (propane or natural gas) plus a 120/240V circuit. Heat/Cool units both heat and chill. Heat Only costs less upfront. Inverter heat pumps run quieter and use less electricity. Cold-climate buyers should size up one tier on heat pumps, or consider a gas heater.

How to Choose the Right Inground Pool Heater

Choose a Heat Pump if... Your pool is used regularly in a warm climate, you want lower monthly operating costs, or you also want to cool the water in summer.
Choose a Gas Heater if... Your pool sits unused for stretches and needs fast heat-up, you're in a cold climate, or you have a large pool or spa where recovery speed matters more than efficiency.
Inverter vs. Standard Inverter heat pumps adjust output based on demand - quieter, more efficient, longer lifespan. Standard models cost less upfront and are simpler.
Natural Gas vs. Propane Same heater, different fuel. Natural gas costs less per BTU in most markets. Propane is the right call when no gas line is available at the installation site.

Questions? We Spec Inground Pool Heater Systems Every Day

Not sure which inground pool heater fits your setup? Call us at 800-809-3741 - we'll match you to the right unit based on your pool size, climate, fuel availability, and budget. We also connect you with licensed local installers through our installation support program.

Inground Pool Heater FAQs

What is the best pool heater for an inground pool?

It depends on how you use the pool and your climate. For most inground pool owners in warm climates who swim regularly, an electric heat pump delivers the lowest operating cost - typically 70 to 80% less per month than gas. For pools that sit unused for long stretches, cold climates, or large pools over 40,000 gallons, a gas heater heats faster and is not limited by air temperature. For very large pools or setups that need both fast recovery and efficient maintenance, pairing a gas heater with a heat pump is worth considering.

What BTU pool heater do I need for a 20,000 gallon inground pool?

For a 20,000 gallon inground pool in a warm climate, a heat pump in the 85,000 to 115,000 BTU range works well for temperature maintenance. In a cool climate, size up to 115,000 to 130,000 BTU. If you prefer a gas heater for this size pool, the Hayward H150 at 150,000 BTU/hr is a solid starting point, or step up to the H200 for faster recovery.

Do inground pool heaters require a gas line?

Only gas heaters do. All heat pump models in this collection run on a dedicated 220-240V electrical circuit - no gas line required. Gas heaters need either a natural gas line or a propane tank plus a smaller 120/240V electrical connection for the control system.

Can a pool heat pump heat and cool my inground pool?

Yes - most heat pump models in this collection are Heat/Cool units. In warm climates like Florida, Texas, and Arizona, summer water temperatures can reach 90 degrees F or above. A heat-and-cool unit lets you dial that back to a comfortable range without any additional equipment. Gas heaters cannot cool the pool.

How long does a pool heater last?

A well-maintained pool heat pump typically lasts 10 to 15 years. Gas heaters typically last 8 to 12 years. Inverter heat pumps often outlast standard models because variable-speed compressors experience less mechanical stress. Key maintenance for both: keep the unit clear of debris, ensure adequate airflow or ventilation clearance, and have a technician inspect refrigerant levels (heat pumps) or heat exchanger condition (gas heaters) every few years.

Do you offer installation?

Yes. Visit our installation support page for details on connecting with a licensed installer in your area. Gas heater installation requires a licensed plumber or HVAC contractor in most jurisdictions.

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