Home Calculators Blog
Modern utility closet with tankless water heater and neat copper piping

Water Heater Cost Calculator

Compare gas tank, electric tank, tankless, heat pump, and solar water heaters — with 10-year total cost of ownership including install, energy, and maintenance, plus IRA rebate eligibility.

group

1. Your Household

Energy prices are state-wide averages from the U.S. Energy Information Administration (EIA). Override with your actual rates in Advanced Settings below for more accurate results.

tune

2. Your Preferences

Energy Prices (editable)

insights

3. Your Water Heater Cost Comparison

redeem IRA Heat Pump Water Heater Rebate

Heat pump water heaters qualify for up to $1,750 under the Inflation Reduction Act's HEAR program. The 25C tax credit may also cover up to $2,000. Check your eligibility.

Equipment + Installation 10-Year Energy Cost 10-Year Maintenance
Water Heater Type Upfront Cost Annual Energy 10-Year Total

Estimates based on household size, tank preference, and state energy prices. Actual costs depend on local labor rates, existing plumbing, and equipment selection. This is a planning tool, not a binding quote.

How This Calculator Works

This calculator estimates the 10-year total cost of ownership for 6 different water heater types, combining three cost components: equipment and installation, annual energy costs, and ongoing maintenance.

Energy costs are calculated using standard thermodynamic formulas. Hot water demand (in BTU) equals gallons per day × 8.33 lbs/gal × temperature rise × 365 days, divided by the unit's efficiency factor (UEF). We convert BTU to therms (for gas) or kWh (for electric) and multiply by your state's energy price.

Temperature rise is the difference between cold water inlet temperature and the 135°F target output. We adjust inlet temperature by state — colder states (Minnesota, Maine) have lower inlet temps around 45°F, while warmer states (Florida, Arizona) start around 72°F. This affects how hard your water heater works.

Efficiency ratings use UEF (Uniform Energy Factor), the current DOE standard. Heat pump water heaters achieve UEF values of 3.5 because they move heat rather than generate it. Solar systems use a solar fraction (50–80% depending on your state's solar resource) to determine how much backup electric heating is needed.

Water Heater Guides

In-depth articles on materials, costs, and decisions.

Frequently Asked Questions

How much does it cost to replace a water heater? expand_more
A standard gas tank water heater replacement costs $1,500–$2,200 total (unit + installation). Electric tank replacements run $1,150–$1,800. Tankless gas units cost $3,700–$5,900 installed, while heat pump water heaters cost $2,700–$3,500 installed. Costs vary by region, tank size, and installation complexity. If existing plumbing and venting are compatible, a basic swap is cheapest. New installations or venting changes can add 30–60% to labor costs.
Tankless vs tank water heater: which is cheaper? expand_more
Tank water heaters are cheaper upfront ($1,150–$2,200 installed vs $2,200–$5,900 for tankless). However, tankless units last 20 years vs 10–12 for tanks and use 8–34% less energy. Over 10 years, the total cost of ownership depends on your energy prices and usage. In states with expensive natural gas or electricity, tankless can break even or save money long-term. Use this calculator to compare for your specific situation.
Are heat pump water heaters worth it? expand_more
Heat pump water heaters are the most energy-efficient option available, using 2–3x less electricity than standard electric tanks. They cost $2,700–$3,500 installed but can save $200–$400/year on energy bills. The IRA's HEAR program offers up to $1,750 in rebates, making the upfront cost much more competitive. They work best in warm or moderate climates and need some space around them for air circulation. For most homeowners replacing an electric tank, a heat pump water heater pays for itself in 4–8 years.
How long does a water heater last? expand_more
Standard gas tank water heaters last 8–12 years (average 10). Electric tank water heaters last 10–15 years (average 12). Tankless water heaters (gas or electric) last 15–25 years (average 20). Heat pump water heaters last 10–15 years (average 13). Solar water heaters last 15–25 years (average 20). Regular maintenance — flushing sediment annually and replacing the anode rod every 3–5 years — can extend lifespan significantly.
What size water heater do I need? expand_more
For tank water heaters: 1–2 people need 30–40 gallons, 3–4 people need 40–50 gallons, and 5+ people need 50–80 gallons. Tankless water heaters are sized by flow rate (GPM) rather than capacity. A typical household needs 7–10 GPM for simultaneous use of multiple fixtures. Heat pump water heaters commonly come in 50 and 80 gallon sizes. Oversizing wastes energy on standby heat loss, while undersizing means running out of hot water.
Are there rebates for water heaters in 2026? expand_more
Yes. The Inflation Reduction Act's HEAR (Home Efficiency Rebates) program offers up to $1,750 for heat pump water heaters for qualifying households. The federal 25C energy efficiency tax credit also covers heat pump water heaters (up to $2,000/year for qualifying equipment). Many state and local utilities offer additional rebates for energy-efficient water heaters. Solar water heaters may qualify for the federal solar tax credit (30% of installed cost). Check with your state energy office and local utility for current programs.

More Home Improvement Calculators

Planning more than a water heater? Browse every free estimator on RemodelCostCalc.

Exterior

drive_eta
Driveway Cost Calculator

Gravel, asphalt, and concrete driveway costs by linear and square foot.
fence
Fence Cost Calculator

Compare wood, vinyl, chain-link, and aluminum fence costs by linear foot.
deck
Deck Cost Calculator

Pressure-treated, cedar, and composite deck costs with railing and stairs.
garage
Garage Floor Epoxy Cost

1-coat, 2-coat, and metallic epoxy floor costs with DIY vs pro pricing.

Landscaping

square
Concrete Cost Calculator

Concrete slab, driveway, and patio pour costs by cubic yard and finish.
potted_plant
Patio Cost Calculator

Concrete, paver, flagstone, and brick patio installation costs by sq ft.
view_module
Retaining Wall Cost Calculator

Concrete block, natural stone, poured concrete, timber, and gabion wall costs.
grass
Sod Installation Cost

Bermuda, Bluegrass, Fescue, Zoysia, and St. Augustine sod costs by sq ft.
foundation
Mulch & Stone Cost Calculator

Mulch, gravel, and river rock volume and cost by area and depth.
nature
Tree Removal Cost Calculator

Tree removal costs by size with stump grinding and debris hauling.

Interior

countertops
Kitchen Remodel Cost Calculator

Minor, mid-range, and major kitchen remodel costs with cabinet and counter pricing.
bathtub
Bathroom Remodel Cost Calculator

Half, full, and primary bathroom remodel costs by tier and fixtures.
layers
Basement Finishing Cost

Framing, drywall, egress, and permit costs to finish a basement.

Home Systems

thermostat
Heating Cost Calculator

Natural gas, propane, oil, electric, and heat pump operating costs by state.
window
Window Replacement Cost

Vinyl, wood, fiberglass, and composite window replacement costs per window.
solar_power
Solar Panel Cost Calculator

System cost, payback period, savings, and federal tax credit by state.