Estimate the annual cost of heating water for your household.
Heating water takes about 8.33 BTUs per gallon per degree Fahrenheit. Scaling that by daily volume and temperature rise, then dividing by efficiency, gives the real draw. Water heating is often the second-largest home energy use, so efficiency and hot water volume heavily shape the bill.
Water Heater Cost
Energy = gallons x 8.33 lb/gal x temperature rise / efficiency
Energy = gallons x 8.33 lb/gal x temperature rise / efficiency Heating water takes about 8.33 BTUs per gallon per degree Fahrenheit. Scaling that by daily volume and temperature rise, then dividing by efficiency, gives the real draw.
Water heating is often the second-largest home energy use, so efficiency and hot water volume heavily shape the bill.
This calculator takes 4 inputs: Hot water per day, Temperature rise, Heater efficiency, Electric rate. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.