12 pages

First Hour Rating by Tank Size and Fuel

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First Hour Rating by Tank Size and Fuel: 12 pages. First hour rating is the number to shop against rather than the gallons. These pages show where it comes from for each tank size, and why a gas tank out-delivers an electric one of the same capacity.

30 gal electric A 30 gallon electric water heater with a 4,500 watt element has an estimated first hour rating of about 42 gallons, from 21 gallon
30 gal gas A 30 gallon gas water heater with a 36,000 BTU burner has an estimated first hour rating of about 59 gallons, from 21 gallons of u
40 gal electric A 40 gallon electric water heater with a 4,500 watt element has an estimated first hour rating of about 49 gallons, from 28 gallon
40 gal gas A 40 gallon gas water heater with a 36,000 BTU burner has an estimated first hour rating of about 66 gallons, from 28 gallons of u
50 gal electric A 50 gallon electric water heater with a 4,500 watt element has an estimated first hour rating of about 56 gallons, from 35 gallon
50 gal gas A 50 gallon gas water heater with a 36,000 BTU burner has an estimated first hour rating of about 73 gallons, from 35 gallons of u
66 gal electric A 66 gallon electric water heater with a 4,500 watt element has an estimated first hour rating of about 67 gallons, from 46.2 gall
66 gal gas A 66 gallon gas water heater with a 36,000 BTU burner has an estimated first hour rating of about 85 gallons, from 46.2 gallons of
75 gal electric A 75 gallon electric water heater with a 4,500 watt element has an estimated first hour rating of about 73 gallons, from 52.5 gall
75 gal gas A 75 gallon gas water heater with a 36,000 BTU burner has an estimated first hour rating of about 91 gallons, from 52.5 gallons of
80 gal electric A 80 gallon electric water heater with a 4,500 watt element has an estimated first hour rating of about 77 gallons, from 56 gallon
80 gal gas A 80 gallon gas water heater with a 36,000 BTU burner has an estimated first hour rating of about 94 gallons, from 56 gallons of u