How much does a solar water heater save per year?

A solar water heater saves $200–$400/year for a typical US household versus a conventional electric water heater. Savings depend on solar fraction (typically 50–80%), household size, and local electricity rates.

What is the monthly cost to run a solar water heater?

With 65% solar fraction, a solar water heater backup costs roughly $12/month for a family of 4 versus $35/month for a standard electric tank — saving about $23/month at US average electricity rates of $0.13/kWh.

How long does it take for a solar water heater to pay for itself?

Most solar water heaters have a payback period of 7–10 years at US average energy rates. The 30% federal tax credit reduces net cost and can shorten payback to 5–7 years. Units typically last 20+ years.

Are solar water heaters worth it in the US?

Yes for most US households staying long term. With the 30% federal tax credit, typical lifetime savings of $5,000–$10,000 are common over a 20-year lifespan, making solar water heaters a strong investment in high-sunshine states.

Updated April 23, 2026

Solar Water Heater Cost

See how much a solar water heater saves per month versus electric and gas tank heaters. Free US savings calculator.

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A solar water heater with 65% solar fraction costs roughly $12/month in backup energy for a family of 4 — saving about $23/month versus a standard electric tank at $0.13/kWh. Annual savings of $276 give a payback period of 7–10 years before the 30% federal tax credit.

Solar Water Heater Savings Calculator

Backup Fuel Type

The conventional backup heater fuel type.

Household Size

Solar Fraction

% of hot water needs supplied by solar. Typical US installs: 65%.

Electricity Rate ($/kWh)US average $0.13/kWh.

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Solar vs Electric vs Gas vs Heat Pump Water Heater (US 2026)

Feature	Solar WH (65%)	Electric Tank	Gas Tank	Heat Pump WH
Monthly cost (3–4 ppl)	~$12	~$35	~$20	~$15
Annual cost	~$144	~$427	~$241	~$179
Efficiency	Solar + 92% backup	92%	80%	250% COP
Lifespan	20+ yr	8–12 yr	8–12 yr	10–15 yr
Upfront cost	$3,000–$6,000	$300–$700	$400–$800	$1,000–$1,500
Federal tax credit	30%	None	None	30%

Electric $0.13/kWh. Gas $1.20/therm. Family of 4. Solar: 65% solar fraction, electric backup. US 2026 average rates.

Solar Water Heater Cost — Is It Worth It?

At 65% solar fraction, a solar water heater cuts monthly water heating costs by roughly 65% versus a standard electric tank. For a family of 4 in a high-sun state like Arizona or Florida, monthly savings of $20–$28 are typical at US average electricity rates.

Upfront installation costs of $3,000–$6,000 are significantly reduced by the 30% federal solar tax credit, bringing net cost to $2,100–$4,200. At $276/year in savings, payback takes 7–10 years — well within the 20+ year unit lifespan.

In low-sunshine states like Washington or Maine, solar fractions fall to 40–50%, reducing savings significantly. Compare solar against a heat pump water heater which achieves similar monthly savings at a lower upfront cost of $1,000–$1,500 in those regions.

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