Pool Heaters for Inground & Above Ground Swimming Pools

Extend your swim season from early spring to late fall with a reliable pool heater built for any climate and any pool size. Whether you prefer the fast heat of gas, the efficiency of a heat pump, or the simplicity of electric, PST Pool Supplies carries the top-rated brands — Hayward, Raypak, and Coates — with BTU outputs ranging from 50,000 to 400,000 for pools of every size.

For the fastest heating performance, gas pool heaters are unmatched. The Hayward H-Series delivers 135,000–400,000 BTU in both natural gas and propane configurations, with low-NOx burners, digital controls, and corrosion-resistant polymer headers built for saltwater compatibility. For year-round energy efficiency, the Hayward HP50HA heat pump harnesses ambient air temperature to heat your pool at a fraction of the operating cost of gas — ideal for climates that stay above 45°F for most of the season. Raypak's gas and electric lineup rounds out the collection with field-proven reliability across commercial and residential installations. Browse our pool heater replacement parts for maintenance essentials. Compare heater types and BTU sizing at Hayward's official pool heater guide.

Choosing the right pool heater comes down to three factors: pool volume, desired temperature rise, and fuel availability. A 20,000-gallon inground pool typically requires a 300,000–400,000 BTU gas heater or a 5–6 ton heat pump to maintain comfortable temperatures efficiently. Electric resistance heaters like the Raypak E3T and Coates CPH series (5.5kW–30kW) are ideal for smaller above ground pools or spas where gas lines aren't available. All models in this collection feature titanium or cupro-nickel heat exchangers for saltwater compatibility and corrosion resistance. For energy-efficiency guidance and rebate eligibility, the U.S. Department of Energy's pool heater guide is an excellent resource. Check our heater parts collection for igniters, headers, and heat exchangers.

Shop pool heaters for inground and above ground pools — find the right BTU, fuel type, and brand to keep your water warm and your season long.