Pool, Spa & Water Treatment Chemistry worked example

Pool Heater Energy Cost with heating energy demand of 830 kBTU: a worked example

Suppose heating energy demand falls to 830 kBTU. This page works the full calculation at that level so you can see exactly which result moves and by how much. Estimate heater energy cost from BTU demand, heater efficiency, and energy price.

The inputs for this scenario

  • Heating energy demand: 830 kBTU (the input this scenario stresses; the baseline uses 1,668)
  • Fuel price per therm: 1.85 $ / therm (held at the documented default)
  • Therms per kBTU conversion: 0.01 therms / kBTU (held at the documented default)
  • Heater efficiency correction: 1.22 x (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Energy cost = heating demand in kBTU x energy price x therms per kBTU x efficiency correction.
  • Heater energy cost works out to 18.73 $ at these inputs, and this is the headline figure for the scenario.
  • Base product works out to 15.36 value at these inputs.
  • Multiplier works out to 1.22 x at these inputs.
  • Factor A x B works out to 1,536 value at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where heating energy demand sits at 1,668 kBTU and the headline result is 37.65 $, this scenario comes in 50.24% below the baseline at 18.73 $.
  • It computes the fuel cost of a single heating event by multiplying kBTU demand by the fuel price, the therms-per-kBTU factor, and an efficiency correction. When the numbers land here, the stressed input is the lever to work; the walkthrough above shows exactly how much each output recovers as it climbs back toward the baseline.

Results at a glance

  • Heater energy cost: 18.73 $ (headline result)
  • Base product: 15.36 value
  • Multiplier: 1.22 x
  • Factor A x B: 1,536 value

Run it with your numbers

  • To rerun this with your own numbers, open the live Pool Heater Energy Cost calculator, set heating energy demand to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.