Natural gas pool heaters are very popular with owners who heat their above ground pools because they have a lower purchase cost than the competing systems. Another advantage of gas heaters is their ability to rapidly raise the pool water temperature. They can also raise the water temperature to higher levels than heat pumps and solar heaters and are used in situations where this is a requirement.
The heat that is generated from the combustion of natural gas is transferred to the pool water in the heat exchanger. The pool water is usually circulated by the existing pool pump if it is adequately sized.
Their low purchase cost is offset by their relatively high operating cost. This is due to the fact that natural gas is a relatively expensive heat source and because gas heaters have a relatively low efficiency. Typically, these heaters operate at an 80% efficiency by the higher efficiency units can be obtained that operate at an efficiency up to 95%.
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 Hayward H400FDN Pool Spa 400 K btu H400 Low NOx heater  US $1,898.99
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 Dual Temperature Control, Jandy LD 125-400 US $250.00
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 Hayward heater 100,000 btu for AG pool and spa H100ID1 US $673.33
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 Jandy Legacy Swimming Pool Heaters 325,000 BTU US $1,789.00
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 PENTAIR 460736 400 K BTU Natural Gas Heater Pool/Spa US $1,967.95
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 15,000 Ing Swimming Pool Solar Panels + Auto Controller US $789.00
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 4-2'x20' Pool Solar Heater Panel System & Roof Mounting US $449.00
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 4'x20' Solar Swimming Pool Heater Panel -Roof mountable US $162.90
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 NEW HAYWARD H250FDN 250 K BTU Natural Gas Heater Pool US $1,498.95
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 HAYWARD 100K BTU Above Ground Pool Heater Spa Nat Gas US $686.66
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 Pentair MiniMax 100,000 BTU 460387 Natural Gas Aboveground Swimming Pool Heater US $761.96
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 4x20 Solar Swimming Pool Heater Replacement Panels US $146.95
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 A/G Pools & Spa Minimax 100 Electric Igni Heater 100BTU US $809.99
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 HAYWARD 100k BTU PROPANE GAS POOL HEATER H100IDP1 US $718.75
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 2'x20' Sungrabber Pool Solar REPLACEMENT Panel (ING) US $80.00
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 4'x12' Swimming Pool Solar Heater Panel ROOF MOUNTABLE US $160.95
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 4' x 20' Sungrabber Pool Solar Replacement (ING) Panels US $151.95
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 4x20 Solar Swimming Pool Heater Panel w/ coupler - NEW US $149.50
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 r0061600 Jandy Teledyne Laars pilot burner nat gas US $35.00
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 32,000 gal Inground Pool Solar Heater 4 Panel System US $809.00
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Natural gas pool heaters are most efficiently operated by running them for a short period of time. This is quite suitable for heating the water and above ground swimming pools since gas heaters can quickly raise the water temperature. They are best used with pools that are not constantly used and do not need to be continuously heated. It is in this manner that most homeowners use of their pools.
Natural gas pool heaters that use electronic ignition will need access to electrical power, either through a hardwired line or an extension cord. They will also need a supply of natural gas that is piped to them from the utility company. If this is not available, a propane pool heater can be used instead.