OmniEstimate · Plumbing · Tankless Water Heaters

Tankless Water Heater Cost Calculator

Choose the fuel, size and installation details and get a planning estimate with a full cost breakdown in under a minute.

1Your tankless water heater

Project ZIP code Please enter a valid 5-digit US ZIP code.

Fuel – for the new water heater

Please choose a fuel.

Size – by how much hot water is used at once

1 bathroomsmall home or apartment2 bathroomstypical home3 bathroomshigh output4+ bathroomshighest output

Homes in cold climates need more output, because the incoming water is colder. If in doubt, choose one size up.Please make a selection.

Heater technology

Non-condensinglower price; metal vent pipeCondensinghigher efficiency; plastic vent pipe

Condensing models cost more to buy and use less gas. They need a drain for condensate.Please make a selection.

2The installation

What kind of job is it?

Replace a tankless heaterlike-for-like swapReplace a tank water heaterconversion to tanklessNew installationno heater there now

Converting from a tank adds venting, mounting and connection changes.Please make a selection.

Gas line

Existing line is large enoughor not sureNeeds a larger lineshort run, up to 15 ftNeeds a larger linelonger run, 15–40 ft

Gas tankless heaters burn far more gas at once than a tank, so the line that fed a tank is often too small.Please make a selection.

Electrical supply

Existing circuits are adequateor not sureNew dedicated circuits neededwiring and breakers

Whole-house electric tankless heaters need several high-amperage circuits. A panel or service upgrade is not included.Please make a selection.

Where will the heater go?

Garage or utility roomeasy accessCloset or tight spaceharder to work inAttic or crawl spacehardest to reachOutdoors on a wallno vent; mild climates

Please make a selection.

When do you need it installed?

Schedulednormal working hoursEmergencysame day, night or weekend

Please make a selection.

Options

Include a permit allowanceMany areas require a permit to install a water heater Add a recirculation pumpHot water reaches distant taps faster Add a scale filterProtects the heater in hard-water areas Add a service valve kitIsolation valves that make descaling quick

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