What Does a Hot Shower Cost? Energy, Water, and Annual Totals by Length
October 29, 2026
Showers are the largest single use of hot water in many homes. To estimate the cost, find how much water you use, how much you must heat it, and what your energy costs. A 10-minute shower with a head flowing 2.0 gallons per minute uses 20 gallons. Raising that water from a groundwater temperature of 50°F to 120°F is a 70°F rise. The energy needed is gallons × 8.34 pounds per gallon × temperature rise: 20 × 8.34 × 70 = 11,676 BTU, which is 3.42 kWh.
With electric resistance heating at $0.16 per kWh, the heating cost is $0.55. With a natural gas water heater at 80% efficiency and $1.50 per therm (100,000 BTU), the cost is 11,676 ÷ (100,000 × 0.8) × $1.50 = $0.22. Add the water itself at $7.50 per 1,000 gallons: $0.15.
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The figures assume one shower a day, 365 days a year, a 2.0 gpm showerhead, electric heating at $0.16 per kWh, and water at $7.50 per 1,000 gallons (sewer charges are extra in many areas). Mixed water is part cold, so the actual hot water used is less than the total, but heating cost is calculated on the mix temperature rise, which is a reasonable approximation. Shorter showers are the most direct way to save.
| Shower length | Gallons | Heating cost (electric) | Water cost | Annual total (365 showers) |
|---|---|---|---|---|
| 5 min | 10 | $0.27 | $0.08 | $128 |
| 8 min | 16 | $0.44 | $0.12 | $204 |
| 10 min | 20 | $0.55 | $0.15 | $256 |
| 15 min | 30 | $0.82 | $0.23 | $383 |
Low-Flow Showerheads
WaterSense-labeled showerheads use no more than 2.0 gallons per minute; many models use 1.5 or 1.75. Switching from 2.5 gpm (the old federal maximum) to 1.5 gpm for a 10-minute shower cuts the water from 25 to 15 gallons per shower, saving 10 gallons. Heating savings scale: 10 gallons × 8.34 × 70 = 5,838 BTU, or 1.71 kWh ($0.27 electric). Over 365 showers, that is $100 on electric heating, plus $27 on water. For a family of four, savings approach $500 a year in an electric home and about $270 with gas. A $20 to $40 showerhead pays back in a few months. Choose heads that feel satisfying; some use aeration or pulsation to maintain pressure.
Other Ways to Save
Lower the water heater setpoint to 120°F, which also reduces the risk of scalding. Install a thermostatic mixing valve or a shower start-up that doesn't waste the cold water at the beginning (a bucket can catch it for plants). Insulate hot water pipes to shorten the wait. A drain-water heat recovery unit can recover 40% to 60% of the heat from shower water. Take shorter showers: cutting two minutes from a 10-minute shower saves 20%. A heat pump water heater reduces the electricity cost by two thirds. Solar water heating can supply a large share in sunny climates.
The Whole Picture
For a household, showers account for about 17% of indoor water use, near 40 gallons per person per day including other uses. Combining heating and water costs, one person's daily 10-minute shower costs about $256 a year with electric heating, or about $135 with gas ($0.22 + $0.15 = $0.37 × 365). The environmental impact scales similarly. These numbers help weigh the value of comfort against cost.
Frequently Asked Questions
How much does a 10-minute shower cost?
About $0.70 with electric heating ($0.55 energy plus $0.15 water) at typical rates.
How many gallons does a shower use?
About 2 gallons per minute with a standard showerhead, so 20 gallons for 10 minutes.
How do I compute shower heating energy?
Gallons × 8.34 × temperature rise in °F gives BTU; divide by 3,412 for kWh.
Do low-flow showerheads save money?
Yes. Going from 2.5 to 1.5 gpm saves about $100 a year in an electric-heated home for a daily 10-minute shower.
What temperature should the water heater be set to?
About 120°F for safety and efficiency.