Water Heater Sizing Calculator
Size a water heater from the fixtures it serves: first-hour rating for residential, or the ASPE recovery-and-storage method for commercial.
Storage and recovery trade against each other. A large tank with a small burner and a small tank with a large burner can serve the same peak – which one is right depends on how sharp that peak is and what the fuel costs.
Need the whole set drawn and stamped? Ask for a fixed quote, or see the other calculators.
Complete MEP permit set built to get approved.
Every mechanical, electrical, plumbing, and fire sheet your reviewer needs — a fixed quote in 24 business hours, first sets in as few as 5 working days, and city comments answered until your permit is issued.