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400,000 BTU Pool Heaters

For pool owners who don’t want to wait and enjoy a heated pool, or need an extra boost of power, 400,000 BTU pool heaters will get the job done in a pinch. These heavy-duty heaters are designed for heating speed and efficiency. And despite the power, a few of the 400,000 BTU heaters at Pool Express are designed to be eco-friendly, for the environmentally conscious pool owner.

Swimming pool heaters are rated according to a measurement known as British Thermal Units, or BTU. One BTU is capable of raising the temperature of 1lb of water by 1 degree Fahrenheit. This means the more BTUs a pool heater produces, the faster it will heat the water in your swimming pool. And 400,000 BTUs is more than enough power. Pool heaters with 400,000 BTUs are a safe bet to quickly heat any sized swimming pool. The pool heater should always be somewhat higher than the actual pool surface area, and the desired temperature rise required. But because there’s no such thing as “oversizing” a pool heater, pool owners typically choose a 400K BTU heater for their fast heating speed. 

Hayward Natural Gas Pool Heater Uni H-Series 400K BTU H400FDN
The Universal H-Series Heater is the world-class heater with an Earth-friendly conscience. While al..
$2,512.50 $2,093.75
Jandy Propane Pool Heater 400K BTU Copper LXI400P
Jandy LXi - The Next Generation in Heating Technology Integrating the most advanced features in ev..
$2,670.00 $2,225.00
Pentair MasterTemp Propane Pool Heater 400K BTU 460737
Pentair MasterTemp is the definition of Fast, efficient, compact, quite, safe and eco-friendly. No ..
$2,526.00 $2,105.00
Raypak RP2100 Natural Gas Pool Heater 399K BTU 009965
The Raypak RP-2100 gives you that endless summer you've always dreamed about. Your pool and spa is ..
$2,259.00 $1,882.50
Raypak RP2100 Propane Pool Pool Heater 399K BTU 009977
The Raypak RP-2100 gives you that endless summer you've always dreamed about. Your pool and spa is ..
$2,248.02 $1,873.35
Jandy Natural Gas Pool Heater 400K BTU LXI400N
Jandy LXi - The Next Generation in Heating Technology Integrating the most advanced features in ev..
$2,668.50 $2,223.75
Raypak RP-2100 Natural Gas Pool Heater 399K BTU 009243
The Raypak RP-2100 gives you that endless summer you've always dreamed about. Your pool and spa is ..
$2,449.50 $2,041.25
Hayward Propane Pool Heater 400K BTU H400FDP
The Universal H-Series Heater is the world-class heater with an Earth-friendly conscience. While al..
$2,523.00 $2,102.50
Raypak Natural Gas Commercial Pool Heater Low NOx ASME  400K BTU  009295
Why Your Commercial Pool Heater Should be ASME? Some local codes require that commercial pools, pub..
$2,722.50 $2,268.75
Raypak  Natural Gas Commercial Pool Heater ASME 400K BTU  009271
Why Your Commercial Pool Heater Should be ASME? Some local codes require that commercial pools, pub..
$2,699.19 $2,249.33
The Raypak RP-2100 gives you that endless summer you've always dreamed about. Your pool and spa is ..
$2,259.00 $1,882.50
Sta-Rite Max-E-Therm Natural Gas Pool Heater 400K BTU SR400NA
For indoor or outdoor installations on pools and spas. Features include an LED temperature readout w..
$2,526.00 $2,105.00