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400,000 BTU Pool Heaters

All Pool Heaters

6 400,000 BTU pool heaters from Pentair, Hayward and Raypak. Most cost $3,799 to $5,099, and half cost less than $4,499.

All filtersFilters (2)×
Heating output: 400000  ×Pool type: Inground  ×Clear all
BrandHayward3Raypak2Pentair1
Heater typeNatural gas4Propane gas2
Heating output4000006
Pool typeInground6
FuelNatural gas3Propane2
Price$4,000 & above4$5,000 & above2
Clear allShow 6 Pool Heaters
Heating output: 400000  ×Pool type: Inground  ×6 resultsSort byRecommendedSpec scorePrice: low to highPrice: high to low
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
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, 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
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
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

pool heaterHeater typeHeating outputPool typeFuelSpec scorePrice
Propane gas400000IngroundPropanen/a$3,799.00
as of 11/04/2026 00:49 PST - Details
Natural gas400000IngroundNatural gasn/a$4,298.99
as of 11/04/2026 00:49 PST - Details
Natural gas400000Ingroundn/a$4,499.00
as of 11/04/2026 00:37 PST - Details
Propane gas400000IngroundPropanen/a$5,099.00
as of 11/03/2026 23:21 PST - Details
Natural gas400000IngroundNatural gasn/a$5,099.00
as of 11/03/2026 23:21 PST - Details
Natural gas400000IngroundNatural gasn/aNo current price

Before you buy

Other Heating output options

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Popular filters

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