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Gas Heater

See also: Categories: Swimming Pool Equipment, Pool Heating


A gas heater heat the pool water by burning either natural gas or liquid propane and as the gas burns, swimming pool water runs through copper coils, and returns to the swimming pool warm


Gas heaters have historically been the most widely-used swimming pool heaters, though their popularity is decreasing due to the advent of and efficiency of heat pumps.

Gas heaters are very effective in cold climates and when used sporadically. Gas heaters greatly benefit swimming pool owners who live in climates where the air temperature is below 60°F (15.5°C) and swimming pool owners who only heat their swimming pools a few times each year. Gas heaters can easily maintain any desired water temperature as typical sizing is based on providing heater capacity capable of achieving a 14°C rise in water temperature in 24 hours. This allows a cold pool to be heated to a 28°C - 30°C in about one day, even in winter time.

How does it work

A gas heater burns either natural gas or liquid propane inside a combustion chamber. Copper coils, which contain swimming pool water, run through the combustion chamber. As the gas burns, swimming pool water runs through these copper coils, and returns to the swimming pool warm. Exhaust created by burning the gas leaves the chamber through a flue

Advantages of Gas Heaters

A gas heater operates independently of air temperature. It will heat your swimming pool more easily in lower temperatures than will a heat pump, which operates less efficiently in lower temperatures. A gas heater also offers the convenience of heating your swimming pool more quickly than a heat pump, which makes it ideal for swimming pool owners who want on-demand heat.

  • Relatively low purchase costs
  • Fast heating
  • Operate independently of air temperature
  • Quiet operation

Disadvantages of Gas Heaters

While gas heaters offer a few valuable advantages, they have quite a few disadvantages. Specifically, a gas heater is the least efficient type of heater, as it has a COP between 0.80 and 0.85. During the last few decades, many consumers were willing to look past this low efficiency because low gas prices made gas heaters very inexpensive to operate. However, the recent increases in gas prices have made gas heaters not only the most inefficient type of heater to operate, but also the most costly to operate

  • Expensive to operate
  • The least efficient heating method: COP between 0.80 and 0.85
  • The life span of gas heaters is typically five years
  • Not environmentally friendly: emit air pollution

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