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Best 400,000 BTU Pool Heaters for Efficient Heating Solutions

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Pentair MasterTemp Propane Heater 175K 200K 250K 300K 400K BTU – Vita Pool Supply
Pentair MasterTemp Propane Heater 175K 200K 250K 300K 400K BTU – Vita Pool Supply

Pentair MasterTemp Natural Gas Heater – 175K 200K 250K 300K 400K BTU

Pentair Pool
$3,399.99 - $4,399.99
$3,399.99 - $4,399.99
$3,399.99 - $4,399.99
$3,399.99
In stock

Pentair MasterTemp® High Performance Pool & Spa Heater Save money and energy with the MasterTemp High-Performance Heater. Already known as bein...

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$3,399.99 - $4,399.99
$3,399.99 - $4,399.99
$3,399.99 - $4,399.99
$3,399.99
Hayward 400K BTU H - Series Propane Heater, Cupronickel, W3H400FDP – Vita Pool Supply
Hayward 400K BTU H - Series Propane Heater, Cupronickel, W3H400FDP – Vita Pool Supply

Hayward 400K BTU H-Series Natural Gas Heater, Cupronickel, W3H400FDN, Low NOx

Hayward
$5,099.00 - $5,099.00
$5,099.00
$5,099.00 - $5,099.00
$5,099.00
In stock

Hayward 400K BTU H-Series Natural Gas Heater, Cupronickel, W3H400FDN The Hayward Universal H-Series Pool and Spa Gas Heaters are known for their en...

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$5,099.00 - $5,099.00
$5,099.00
$5,099.00 - $5,099.00
$5,099.00
Hayward 400K BTU H - Series Propane Heater, Cupronickel, W3H400FDP – Vita Pool Supply
Hayward 400K BTU H - Series Propane Heater, Cupronickel, W3H400FDP – Vita Pool Supply

Hayward 400K BTU H-Series Propane Heater, Cupronickel, W3H400FDP, Low NOx

Hayward
$5,099.00 - $5,099.00
$5,099.00
$5,099.00 - $5,099.00
$5,099.00
In stock

Hayward 400K BTU H-Series Propane Heater, Cupronickel, W3H400FDP The Hayward Universal H-Series Pool and Spa Gas Heaters are known for their energy...

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$5,099.00 - $5,099.00
$5,099.00
$5,099.00 - $5,099.00
$5,099.00
Hayward FDXLHXA1400 Heat Exchanger Assembly H400FD 400K BTU – Vita Pool Supply
Hayward FDXLHXA1400 Heat Exchanger Assembly H400FD 400K BTU – Vita Pool Supply

Hayward FDXLHXA1400 Heat Exchanger Assembly H400FD 400K BTU

Hayward
$1,789.99 - $1,789.99
$1,789.99
$1,789.99 - $1,789.99
$1,789.99
In stock

Hayward Heat Exchanger Assembly Replacement for Hayward H400FD Universal H-Series Low Nox Pool Heater, FDXLHXA1400 This Heat Exchanger Assembly is ...

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$1,789.99 - $1,789.99
$1,789.99
$1,789.99 - $1,789.99
$1,789.99
Pentair 77707 - 1441 400K Natural Gas to Propane Conversion Kit for Max - E - Therm & Mastertemp – Vita Pool Supply

Pentair 77707-1441 400K Natural Gas to Propane Conversion Kit for Max-E-Therm & Mastertemp

Pentair Pool
$69.99 - $69.99
$69.99
$69.99 - $69.99
$69.99
In stock

Pentair 77707-1441 Natural Gas to Propane Conversion Kit For Model 400 Max-E-Therm Heater Burner System Brand: Pentair Weight: 0.1 pound Shipping ...

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$69.99 - $69.99
$69.99
$69.99 - $69.99
$69.99
Hayward H - Series FDXLGSV0001 Natural Gas Valve Kit for 150 - 400K Pool Heaters - Vita Pool Supply
Hayward H - Series FDXLGSV0001 Natural Gas Valve Kit for 150 - 400K Pool Heaters – Vita Pool Supply

Hayward H-Series FDXLGSV0001 Natural Gas Valve Kit for 150-400K Pool Heaters

Hayward
$379.99 - $379.99
$379.99
$379.99 - $379.99
$379.99
In stock

GAS VALVE NATURAL FD

$379.99 - $379.99
$379.99
$379.99 - $379.99
$379.99
Raypak 399K BTU Digital Propane Heater, B - R406A - EP - C 017386 – Vita Pool Supply
Raypak 399K BTU Digital Propane Heater, B - R406A - EP - C 017386 – Vita Pool Supply

Raypak 406A ASME Digital LP Propane Heater Bronze Headers, 399K BTU, B-R406A-EP-C #57 017386

Raypak
$5,002.00 - $5,002.00
$5,002.00
$5,002.00 - $5,002.00
$5,002.00
In stock

Raypak 406A ASME Digital LP Propane Heater Bronze Headers, 399K BTU, B-R406A-EP-C #57 017386 The Raypak B-R399A Digital Pool and Spa Heater deliver...

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$5,002.00 - $5,002.00
$5,002.00
$5,002.00 - $5,002.00
$5,002.00
Raypak 399K BTU Digital Propane Heater, B - R406A - EP - C 017386 – Vita Pool Supply
Raypak 399K BTU Digital Propane Heater, B - R406A - EP - C 017386 – Vita Pool Supply

Raypak 406A ASME Digital LP Propane Heater Bronze Headers, Cupronickel 399K BTU, B-R406A-EP-X 017414

Raypak
$5,596.00 - $5,596.00
$5,596.00
$5,596.00 - $5,596.00
$5,596.00
In stock

Raypak 399K BTU Propane Heater 406A with Cupro-Nickel Heat Exchanger | Model B-R406AEPX 017414 The Raypak B-R406A Digital Pool and Spa Heater deliv...

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$5,596.00 - $5,596.00
$5,596.00
$5,596.00 - $5,596.00
$5,596.00
Raypak 266A Digital Natural Gas Heater, P-R266A-EN-C 009217 009221 – Vita Pool Supply
Raypak 399K BTU Digital Propane Heater 406A (P - R406A - EP - C 009227) – Vita Pool Supply

Raypak 406A Digital LP Propane Heater, P-R406A-EP-C 009227, 399K BTU

Raypak
$4,200.00 - $4,200.00
$4,200.00
$4,200.00 - $4,200.00
$4,200.00
In stock

Raypak Digital Gas Pool & Spa Heater (206A-406A) Efficient, Durable, and Smart Heating The Raypak Digital Gas Pool & Spa Heater delivers re...

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$4,200.00 - $4,200.00
$4,200.00
$4,200.00 - $4,200.00
$4,200.00
Raypak 406A Digital Bronze ASME Natural Gas Heater (B - R406A - EN - C 017374) – Vita Pool Supply
Raypak 207A Low NOx ASME Digital Natural Gas Heater Bronze Headers Cupronickel, B-R207A-EN-X 017709

Raypak 406A ASME Digital Natural Gas Heater Bronze Headers, B-R406A-EN-C 017374, 399K BTU

Raypak
$5,002.00 - $5,002.00
$5,002.00
$5,002.00 - $5,002.00
$5,002.00
In stock

Raypak 406A ASME Digital Natural Gas Heater Bronze Headers, B-R406A-EN-C 017374, 399K BTU The Raypak Digital Gas Pool & Spa Heater delivers rel...

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$5,002.00 - $5,002.00
$5,002.00
$5,002.00 - $5,002.00
$5,002.00
Pentair Sta - Rite Max - E - Therm 400 HD Natural Gas Pool Heater, Cupronickel, SR400HD, 400K BTU – Vita Pool Supply
Pentair Sta - Rite 200K BTU Max - E - Therm Natural Gas Heater SR200NA – Vita Pool Supply

Pentair Sta-Rite Max-E-Therm 400 HD Natural Gas Pool Heater, Cupronickel, SR400HD, 400K BTU

Pentair Pool
In stock

Pentair Max-E-Therm® SR400HD 400 HD Natural Gas Pool & Spa Heater 400K BTUYour Pool Heater Just Got a Whole Lot Smarter Save money and energy w...

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Pentair Sta - Rite 400K BTU Max - E - Therm Propane Gas Heater SR400LP – Vita Pool Supply
Pentair Sta - Rite 400K BTU Max - E - Therm Propane Gas Heater SR400LP – Vita Pool Supply

Pentair Sta-Rite Max-E-Therm 400 Propane Gas Heater, SR400LP, 400K BTU

Pentair Pool
In stock

Pentair Max-E-Therm® SR400LP Liquid Propane Pool & Spa Heater 400K BTU For indoor or outdoor installations on pools and spas. Features include ...

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Pentair 400K BTU MasterTemp 400 Natural Gas Heater 460736 – Vita Pool Supply
Pentair 400K BTU MasterTemp 400 Natural Gas Heater 460736 – Vita Pool Supply

Pentair MasterTemp 400 Natural Gas Heater, 460736, 400K BTU

Pentair Pool
In stock

Pentair MasterTemp® 460736 Digital High Performance Low NOx Pool and Spa Heater; 400K BTU, Natural Gas The MasterTemp pool heater sets the industry...

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Pentair 400K BTU MasterTemp 400 Heavy Duty Natural Gas Heater Cupronickel 460805 400HD – Vita Pool Supply
Pentair 400K BTU MasterTemp 400 Heavy Duty Natural Gas Heater Cupronickel 460805 400HD – Vita Pool Supply

Pentair MasterTemp 400HD Natural Gas Heater, Cupronickel, 460805, 400K BTU

Pentair Pool
In stock

Pentair MasterTemp® 460805 Pool and Spa Heater; 400HD BTU, Natural Gas, Cupro-Nickel Tubing MASTERTEMP® HD Heavy Duty Heater: The MasterTemp HD is ...

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Pentair Sta - Rite 200K BTU Max - E - Therm Natural Gas Heater SR200NA – Vita Pool Supply
Pentair Sta - Rite 200K BTU Max - E - Therm Natural Gas Heater SR200NA – Vita Pool Supply

Pentair Sta-Rite Max-E-Therm 400 Natural Gas Heater, SR400NA, 400K BTU

Pentair Pool
In stock

Pentair Max-E-Therm® SR400NA 400 Natural Gas Pool & Spa Heater 400K BTU; Cupro-Nickel Tubing For indoor or outdoor installations on pools and s...

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Raypak X94 Professional Digital Natural Gas Heater ASME, 399K BTU, S - R410 - EN AS 014280 – Vita Pool Supply
Raypak X94 Professional Digital Natural Gas Heater ASME, 399K BTU, S - R410 - EN AS 014280 – Vita Pool Supply

Raypak X94 Professional Digital Natural Gas Heater ASME, 399K BTU, S-R410-EN AS 014280

Raypak
$15,838.00 - $15,838.00
$15,838.00
$15,838.00 - $15,838.00
$15,838.00
In stock

Raypak 014280 S-R410 X94 Professional Series ASME Digital Condensing Pool Heater; 399000 BTU, Natural, Super-Austenitic Stainless Steel Tubing The ...

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$15,838.00 - $15,838.00
$15,838.00
$15,838.00 - $15,838.00
$15,838.00
Hayward 400K BTU H - Series OmniX Propane Heater, W3HS400FDP, Cupronickel, Low NOx – Vita Pool Supply
Hayward 400K BTU H - Series OmniX Natural Gas Heater, W3HS400FDN, Cupronickel, Low NOx – Vita Pool Supply

Hayward 400K BTU H-Series OmniX Natural Gas Heater, W3HS400FDN, Cupronickel, Low NOx

Hayward
$5,399.00 - $5,399.00
$5,399.00
$5,399.00 - $5,399.00
$5,399.00
In stock

Hayward Universal H-Series Heater 400,000 BTU - Natural Gas w/ OmniX Universal H-Series pool and spa gas heaters are engineered for easy drop-in re...

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$5,399.00 - $5,399.00
$5,399.00
$5,399.00 - $5,399.00
$5,399.00
Hayward 400K BTU H - Series OmniX Propane Heater, W3HS400FDP, Cupronickel, Low NOx – Vita Pool Supply
Hayward 400K BTU H - Series OmniX Propane Heater, W3HS400FDP, Cupronickel, Low NOx – Vita Pool Supply

Hayward 400K BTU H-Series OmniX Propane Heater, W3HS400FDP, Cupronickel, Low NOx

Hayward
$5,399.00 - $5,399.00
$5,399.00
$5,399.00 - $5,399.00
$5,399.00
In stock

Hayward Universal H-Series Heater 400,000 BTU - Propane w/ OmniX Universal H-Series pool and spa gas heaters are engineered for easy drop-in replac...

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$5,399.00 - $5,399.00
$5,399.00
$5,399.00 - $5,399.00
$5,399.00

Best 400,000 BTU Pool Heaters for Efficient Heating Solutions

A 400,000 BTU pool heater is a powerful and efficient solution for heating large pools quickly and effectively. Delivering 400,000 British Thermal Units (BTUs) per hour, this high-performance unit is ideal for pools ranging from 20,000 to 40,000 gallons, depending on factors such as climate, pool usage, and target water temperature. Perfect for residential and commercial applications, these heaters are commonly used for medium to large in-ground pools, as well as pools with attached spas or high-demand heating requirements.

With its impressive BTU rating, a 400,000 BTU pool heater ensures rapid heat-up times and consistent water temperatures, making it an excellent choice for pool owners in cooler climates or those who value year-round comfort. Whether you're looking to extend your swimming season or enjoy warm water on demand, this type of pool heater delivers dependable performance and energy efficiency.