Question: how much does it cost to heat a pool with gas?
Answer: Natural gas heaters (also known as NG heaters) use about 1 therm per hour per 100,000 BTU's. For a typical size 400,000 BTU pool heater, that's 4 therms per hour. Currently, natural gas runs about $1.50 per therm near Tampa. The average cost to heat a pool for one hour on natural gas is around $ 7.00.