🚿 First Hour Rating (FHR) Gallons, Tankless vs Tank & Gas vs Electric

Water Heater First Hour Rating & Energy Cost Calculator

Calculate peak hour hot water demand (FHR in gallons), compare high-efficiency tankless condensing natural gas units against commercial hybrid heat pump water heaters, and calculate 10-year operating fuel and replacement payback.

1. Project & Operating Inputs

Peak Hour Hot Water Demand (Gallons / Hour)

Electric Utility Tariff ($ / kWh)

Current Standard Electric Water Heating Annual Cost ($)

Hybrid Heat Pump Water Heater Turnkey Install ($)

2. Financial Breakdown & Yield

WATER HEATER FHR & ENERGY COST

Annual Operating Savings

Heat Pump Payback ROI

0.0%

Gross Revenue / Bill

Total Project CapEx

Operating / Material Cost