Best 400k Btu Pool Heaters In February 2025

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Below is the top 10 Best 400k Btu Pool Heaters review to guide you buy the best product. Choose one of these products and your satisfaction is guaranteed!

To help you in your search, we have completed this list of the Best 400k Btu Pool Heaters.

Top Rated Best 400k Btu Pool Heaters Of 2025

Rank	Product Name	Score
1	FibroPool FH 220 Swimming Pool Heater Heat Pump Buy Now	9.7 Buy Now
2	Raypak 406,000 BTU Digital Electronic Ignition Natural Gas Pool Heater Buy Now	9.5 Buy Now
3	EcoSmart SMART POOL 27 Electric Tankless Pool Heater, 27kW, 240 Volt, 112.5 Amps Buy Now	9.1 Buy Now
4	Hayward W3H400FDP Universal H-Series 400,000 BTU Pool and Spa Heater, Propane Buy Now	8.8 Buy Now
5	Hayward W3H400FDN Universal H-Series 400,000 BTU Pool and Spa Heater, Natural Gas Buy Now	8.6 Buy Now
6	Raypak 406,000 BTU Digital Electronic Ignition Propane Pool Heater Buy Now	8.3 Buy Now
7	Pentair 460775 MasterTemp High Performance Eco-Friendly Pool Heater, Natural Gas, 400,000 BTU, ASME Buy Now	8.1 Buy Now
8	Sta-Rite SR200LP Max-E-Therm Black Propane Gas Pool and Spa Heater, 200-BTU Buy Now	7.8 Buy Now

1. FibroPool FH 220 Swimming Pool Heater Heat Pump

• 4.85 cop. best in its class
• Suitable for pools up to 7,500 gallons in coastal climates
• 240 volts- 60 hz american voltage
• 20,000 btu/hr heating capacity
• Suitable for all hot tubs

2. Raypak 406,000 BTU Digital Electronic Ignition Natural Gas Pool Heater

3. EcoSmart SMART POOL 27 Electric Tankless Pool Heater, 27kW, 240 Volt, 112.5 Amps

• Eco smart pool heaters are compact and easy to install for a new or existing pool
• Flow activation
• Can be used as an alternative to or booster to heat pump.
• Set your temperature digitally to increments of 1-degree. set it and forget it.
• Compatible with eco smart remote control. activation flow - 12 +/- 2 gpm
• Wattage: 27000.0

4. Hayward W3H400FDP Universal H-Series 400,000 BTU Pool and Spa Heater, Propane

• Industry-leading hydraulic design reduces circulation pump run time to provide major energy savings
• Low nox emissions meet air quality standards in all low-nox areas, ensuring low environmental impact
• The hayward universal h-series 400,000 btu propane heater delivers premium heating performance for years of reliable, long-lasting comfort
• Front-panel-only access and intuitive control pad provide easy operation, service and maintenance
• A durable cupro nickel heat exchanger offers exceptional protection against corrosion and premature failure caused by unbalanced water chemistry

5. Hayward W3H400FDN Universal H-Series 400,000 BTU Pool and Spa Heater, Natural Gas

• A durable cupro nickel heat exchanger offers exceptional protection against corrosion and premature failure caused by unbalanced water chemistry
• Low nox emissions meet air quality standards in all low-nox areas, ensuring low environmental impact
• Industry-leading hydraulic design reduces circulation pump run time to provide major energy savings
• The hayward universal h-series 400,000 btu natural gas heater delivers premium heating performance for years of reliable, long-lasting comfort
• Front-panel-only access and intuitive control pad provide easy operation, service and maintenance

6. Raypak 406,000 BTU Digital Electronic Ignition Propane Pool Heater

• Features polytuf powder coating, polymer headers, and an all copper-fin-tube heat exchanger
• Cabinet and the internals are non-corrosive and rust resistant
• Also features a stainless steel tube sheet, 2 inch cpvc water connections, burner tray and fire tile
• Microprocessor-controlled thermostat can be set precisely to your liking , set it and forget it
• 406,000 btu propane digital pool and spa heater

7. Pentair 460775 MasterTemp High Performance Eco-Friendly Pool Heater, Natural Gas, 400,000 BTU, ASME

• Manual gas shut-off when service is required
• Mastertemp is certified for low nox emission and outperforms industry standards
• Best-in-class energy efficiency
• Heats up fast so no long waits before enjoying your pool or spa

8. Sta-Rite SR200LP Max-E-Therm Black Propane Gas Pool and Spa Heater, 200-BTU

• Rustproof housing sleek, matte black enclosure is made of dura-glass - an exclusive sta-rite material that handles the heat and weathers the elements
• Lightweight - lightest heater in its class
• Custom or retrofit - direct-connects to sta-rite system:3® mod media filter or easily fits other systems
• Lower operating costs - 84% efficiency rating - rated 1st in its class for highest energy efficiency
• Compact design - ideal for retro-fit installation