Sizing A Pool Heater Calculator
Sizing A Pool Heater Calculator . With gas and propane pool heaters being the most powerful pool heating units you can use for residential use, they have btu output ranging from 100,000 to 500,000. This answer is the minimal btu size recommended for that particular surface area. Hayward H300FD Natural Gas or Propane Pool Heater 300,000 BTU from www.poolheatpumps.com Up to 17,000 gallons up to 27′ round or 18′ x 33′ oval. Both the shape and size of your pool or spa affect the time it takes to heat up and the amount of energy required to heat it. This total figure of 3,735,000btu is the energy produced by the pool heater in 24hrs.