Homeowners may wish to improve their swimming pool enjoyment with the use of a gas pool heater. An unheated pool will stay generally at about the average outdoor temperature. For the typical user, comfortable pool water temperatures are 78 degrees to 82 degrees in spring and fall and 76 degrees to 78 degrees in winter.

Spa temperatures can average near or over 100 degrees, depending on the user. The average yearly cost for heating a residential pool using an electrical resistance pool heater is about 2.5 times the cost of using a natural gas pool heater. Spa heaters run about the same.