400,000 BTU Pool Heaters

All Pool Heaters

10 400,000 BTU pool heaters from Pentair, Hayward and Raypak. Most cost $4,281 to $5,099, and half cost less than $4,447.

Top brands: Pentair (5)

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

Raypak

Natural gas, 400000 Heating output, Inground, Natural gas

+400K BTU output for heating larger inground pools

+Runs on natural gas fuel

+Built for inground pool and spa use

−Requires a natural gas line rather than electric hookup

$4,298.99

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

Pentair

Natural gas, 400000 Heating output, Natural gas

+400,000 BTU output for larger pools

+Natural gas fuel, no propane tank needed

+Titanium heat exchanger for corrosion resistance

−Requires a natural gas line connection

No price recorded yet.

Pentair

Natural gas, 400000 Heating output, Inground

+Rated at 400,000 BTU for inground pool heating

+Runs on natural gas fuel

+Suitable for both pools and spas

$4,499.00

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

Pentair

400000 Heating output

+Rated at 400,000 BTU, a high output for large pools

$4,739.00

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

Hayward

Natural gas, 400000 Heating output, Inground, Natural gas

+400000 heating output: the highest heating output of the 10 here

$5,099.00

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

Hayward

Natural gas, 400000 Heating output, Inground, Natural gas

+400000 heating output: the highest heating output of the 10 here

No price recorded yet.

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
Natural gas	400000	Inground	Natural gas	n/a	$4,298.99 as of 11/04/2026 00:49 PST - Details
Natural gas	400000		Natural gas	n/a	No current price
Natural gas	400000	Inground		n/a	$4,499.00 as of 11/04/2026 00:37 PST - Details
	400000			n/a	$4,739.00 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
Natural gas	400000	Inground	Natural gas	n/a	$5,099.00 as of 11/03/2026 23:21 PST - Details
Natural gas	400000	Inground	Natural gas	n/a	No current price

Before you buy

Pool Heater Sizing, BTU and Heat Pump vs Gas

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

400,000 BTU Pool Heaters

Compare specs

Before you buy

Other Heating output options

Popular filters

Pool Heaters by use

Related product types