How it Works
Energy (kWh) = (Gallons * 8.34 * Temp Rise F) / 3412.
What is Water Heating Energy Calculator?
Thermodynamics calculation based on specific heat capacity of water.
Step-by-Step Guide
- Volume: Gallons/Liters.
- Temp Rise: Target - Start Temp.
- Calculate: kWh required.
Example
Input: 50 gal, +60°F
Result: 7.3 kWh
FAQ
Time to heat?
Depends on heater wattage (kWh / kW).
Standby loss?
Tanks lose heat over time; insulate them.
Electric vs Gas?
Formula gives energy needs; cost depends on fuel.
Weight?
Water weighs ~8.34 lbs/gallon.
Metric?
Use 4184 Joules per kg per °C.
Conclusion
Heating water is energy-intensive. Lowering your heater setpoint to 120°F (49°C) is the easiest way to save money and prevent scalding.