Water Heater Energy Calculator
Calculates and compares 10-year operating costs, annual kilowatt-hour (kWh) and therm consumption, and Energy Star Uniform Energy Factor (UEF) efficiency ratings across standard electric resistance tanks (0.92 UEF), gas tankless (0.95 UEF), and hybrid heat pump water heaters (3.75 UEF).
Formula
Heat Pump Water Heater uses ~70% less electricity than standard electric resistance tanks, saving ~$350–$450/year.
1. Daily Hot Water Usage: 2 people = 35 gal; 3 people = 50 gal; 4 people = 64 gal; 5+ people = 85 gal 2. Annual Energy Consumption: - Standard Electric Tank: ~3,800 kWh/yr ($608/yr @ $0.16/kWh) - Hybrid Heat Pump Tank: ~1,100 kWh/yr ($176/yr @ $0.16/kWh) - Gas Tankless Condensing: ~140 Therms/yr ($196/yr @ $1.40/therm) 3. Annual Savings Switching to Heat Pump = Standard Electric Spend - Heat Pump Spend 4. Federal Tax Credit (Section 25C) = 30% of installed cost up to $2,000
Inputs
- Number of People in Household
- Current Water Heater Type
Worked example
Comparing annual operating costs for a 4-person household.
Outcome: A standard electric tank consumes ~3,800 kWh/year ($608/year). A hybrid heat pump water heater consumes only ~1,100 kWh/year ($176/year), saving $432 every year ($4,320 over 10 years). Plus, qualifies for a $500–$800 federal tax credit and local electric utility rebates.
Do heat pump water heaters make the surrounding room colder?
Yes, heat pump water heaters extract ambient heat from the surrounding air to warm the water, which slightly cools and dehumidifies the basement or garage (dropping room temperature by 2°F to 4°F while running). This provides free dehumidification for damp basements.