Water Heater Energy Calculator
Calculate your water heater’s energy consumption, costs, and efficiency. Determine optimal settings based on water heater type, household size, and local energy rates.
Step 1: Water Heater Specifications
Understanding Energy Factor
The Energy Factor (EF) measures overall efficiency. Higher values indicate better efficiency. Gas heaters: 0.5-0.7, Electric: 0.9-0.95, Heat pumps: 2.0-4.0, Tankless: 0.8-0.96.
Step 2: Usage & Costs
About Water Heating Costs
Water heating accounts for 14-18% of home energy bills. Reducing temperature by 10°F can save 3-5% on energy costs. Insulating your tank can reduce standby heat loss by 25-45%.
Water Heater Energy Results
Estimated Annual Cost
Water Heater Type Comparison
| Heater Type | Avg. Annual Cost | Efficiency | Lifespan |
|---|
Energy Use Breakdown
Energy Calculation Formula
Energy = (Gallons × 8.33 × ΔT) ÷ (EF × Energy Content)
Gallons: daily hot water usage. ΔT: temperature rise. EF: energy factor. Energy content: 3412 BTU/kWh or 100,000 BTU/therm.
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