400,000 BTU Pool Heaters

4 400,000 BTU pool heaters from Pentair, Hayward and Raypak. Prices run $3,799 to $5,099.

Raypak

Propane gas, 400000 Heating output, Inground, Propane

+400K BTU output for heating larger inground pools

+Runs on propane fuel

+Built for inground pool and spa use

−Requires a propane supply rather than electric hookup

$3,799.00-10%List: ~~$4,199.00~~

as of 11/04/2026 00:49 PST - Details

Pentair

Propane gas, 400000 Heating output, Propane

+Rated at 400,000 BTU for larger pool heating

+Runs on propane gas fuel

+High performance MasterTemp model for pool use

−Requires a propane gas supply to operate

$4,281.00

as of 11/04/2026 00:37 PST - Details

Hayward

Propane gas, 400000 Heating output, Inground, Propane

+400,000 BTU output for fast heating of large inground pools

+Runs on propane gas fuel

+Gas-fired design heats quickly regardless of outdoor temperature

−Propane fuel requires a propane supply connection

$5,099.00

as of 11/03/2026 23:21 PST - Details

Pentair

Propane gas, 400000 Heating output, Propane

+400,000 BTU output for larger pools

+Low NOx emissions design

+Propane gas fuel option

−Requires a propane supply connection

$4,395.00

as of 11/04/2026 00:37 PST - Details

Compare specs

Heater type	Heating output	Pool type	Fuel	Spec score	Price
Propane gas	400000	Inground	Propane	n/a	$3,799.00 as of 11/04/2026 00:49 PST - Details
Propane gas	400000		Propane	n/a	$4,281.00 as of 11/04/2026 00:37 PST - Details
Propane gas	400000	Inground	Propane	n/a	$5,099.00 as of 11/03/2026 23:21 PST - Details
Propane gas	400000		Propane	n/a	$4,395.00 as of 11/04/2026 00:37 PST - Details

Spec scores, pros and cons, and prices are explained in the How it works section of the About page.