Best 400K BTU Pool Heaters
Updated July 2025
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Best 400K BTU Pool Heaters
2025 Buyer's GuideUpdated July 2025
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Hayward W3H400FDN Universal H-Series 400,000 BTU Natural Gas Pool and Spa Heater for In-Ground Pools and Spas
Functionality
Heat level
Ease of installation
Energy efficiency
2
3
4
4
FibroPool Swimming Pool Heat Pump - FH270 70,000 BTU - for Above and In Ground Pools and Spas - High Efficiency, All Electric H...
FIBROPOOL
Heat level
Ease of installation
Value for money
Quiet operation
Energy efficiency
Quality
5
7
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Aquastrong 35,000 BTU Inverter Swimming Pool Heat Pump, 9,000 Gallons Electric Pool Heater for Above Ground and Inground Pool, ...
Functionality
Ease of installation
Heat transfer
Value for money
Quietness
Design
8
Our Top Choice
1
1
Hayward W3H400FDN Universal H-Series 400,000 BTU Natural Gas Pool and Spa Heater for In-Ground Pools and Spas
Functionality
Heat level
Ease of installation
Energy efficiency
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