Water Heater Cost Rechner
Schätzen Sie monthly und annual water heater operating costs. Compare gas und electric water heating expenses.
Monatliche Kosten
$9.92
Monthly Cost vs Hot Water Usage
Formel
Water Heater Operating Cost
Water heating is the second largest energy expense in most homes, accounting for 14-18% of utility bills.
Formula
Daily BTU = Gallons/Day x 8.33 (lbs/gal) x Temp Rise (°F)
Daily Therms = Daily BTU / 100,000 / Efficiency
Monthly Cost = Daily Therms x 30.44 x Cost per Therm
8.33 is the weight of one gallon of water in pounds. One BTU raises one pound of water by 1°F.
Lösungsbeispiel
50 gallons/day, 60°F temperature rise, 92% efficient gas heater at $1.20/therm.
- 01Daily BTU = 50 x 8.33 x 60 = 24,990 BTU
- 02Daily therms = 24,990 / 100,000 / 0.92 = 0.272 therms
- 03Monthly cost = 0.272 x 30.44 x $1.20 = $9.93
- 04Annual cost = 0.272 x 365 x $1.20 = $119.07
Häufig Gestellte Fragen
How can I reduce water heating costs?
Lower the thermostat to 120°F, insulate the tank and hot water pipes, use low-flow fixtures, and wash clothes in cold water. These can cut costs 25-50%.
Gas vs electric water heater?
Gas heaters cost less to operate in most areas ($250-400/yr) vs electric ($400-600/yr). Heat pump water heaters are the most efficient electric option at 2-3x the efficiency.
What is the right temperature setting?
120°F is recommended for most households. It prevents scalding, reduces energy waste, and slows mineral buildup. Dishwashers typically have internal boosters.
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