Water heater cost dataset

Line items

Lines marked conditional only apply to some configurations — a gas connector on gas appliances, an expansion tank on a closed system, and so on. The calculator turns them on and off from what you tell it.

Equipment categories

These five follow the federal definitions used by ENERGY STAR, Residential Water Heaters Key Product Criteria rather than a grouping of our own. Retrieved 2026-08-21.

The reasoning behind each figure

Written out so that someone who fits these for a living can point at the exact assumption that is wrong. A number with no reasoning behind it cannot be corrected.

Gas storage water heaterestimated, ±40%

• Priced per gallon of rated capacity, so a 50-gallon unit lands around $650 to $1,500. Standard atmospheric-vent tanks sit at the bottom of the band; power-vent and high-recovery models at the top.
• Manufactured goods shipped nationally, so geography barely moves the price. What moves it is efficiency tier and warranty length, which is why the band is wide in a way that has nothing to do with where you live.

Electric storage water heaterestimated, ±38%

• Cheapest unit to buy of the five: no burner, no vent, no gas valve. A 50-gallon lands around $500 to $1,100.
• Band covers basic single-element models through longer-warranty units with better anodes and insulation.

Heat pump (hybrid) water heaterestimated, ±30%

• Two to three times the purchase price of a plain electric tank, and roughly a third of the running cost. A 50-gallon unit lands around $1,400 to $2,600.
• This is the category where rebates most often exist, and rebates are deliberately excluded from every figure on this site because they vary by utility and expire without notice.

Gas tankless water heaterestimated, ±44%

• Whole-house condensing units sit at the top of the band, non-condensing and single-point units at the bottom.
• The unit is rarely what makes a tankless conversion expensive. The gas line and the vent usually are, and both are separate lines below.

Electric tankless water heaterestimated, ±45%

• The cheapest unit of the five to buy and, in a whole-house installation, usually the most expensive to install. A whole-house electric tankless draws far more current than a tank, which is why the electrical line below is so large.

Plumber: remove old unit, set and connect new one

• The wage behind the hour is official BLS data adjusted to your metropolitan area. The number of hours is our estimate.
• A like-for-like tank swap is a short job. A tankless conversion is not: it is a different appliance in a different place with different services.

Electrician: circuit for the new appliance

• Only where the appliance needs electrical work a plumber cannot do. A whole-house electric tankless needs multiple high-current circuits; a heat pump usually needs one.

Flexible water connectors, unions and shutoffestimated, ±51%

• Standardised plumbing parts sold everywhere, so a narrow band. Dielectric unions at the top, plain braided connectors at the bottom.
• Modelled as a lot rather than itemised: listing six small fittings separately would give false precision, not more accuracy.

Temperature and pressure relief discharge pipeestimated, ±47%

• Required on every storage unit. Cheap, standardised, and one of the things an inspector will fail you on if it terminates in the wrong place.

Gas flex connector and sediment trapestimated, ±52%

• Gas appliances only. The sediment trap is code in most jurisdictions and is frequently missing on older installations, which is why it turns up on the invoice.

Electrical whip and disconnectestimated, ±53%

• Electric storage and heat pump units. Standardised electrical parts, narrow band.

Thermal expansion tankestimated, ±53%

• Required wherever a check valve or pressure-reducing valve makes the plumbing a closed system, which is most modern supplies. Many older houses do not have one and are required to fit one at replacement.
• This is the single most common surprise on a water heater invoice. It is a cheap part; the surprise is that nobody mentions it beforehand.

Drain pan and drain lineestimated, ±58%

• Required where a leak would damage the building: attics, upper floors, finished space. The pan itself is cheap; running the drain to somewhere legal is what costs.
• Wide band because the drain run can be two feet or forty.

Seismic strappingestimated, ±52%

• Required in seismic zones, notably across California and parts of the Pacific Northwest. Two straps and blocking; cheap, and an automatic inspection failure if missing.

New ventingestimated, ±63%

• Where the old flue cannot be reused. Efficiency rules have changed what many units need, and a modern unit often will not connect to an old chimney the way the one it replaces did.
• Wide band because a short B-vent reconnection and a full run of concentric PVC through a wall are very different jobs.

Gas line upsizingestimated, ±60%

• The line that ruins tankless budgets. A tank burner is modest; a whole-house tankless fires at several times that, and the existing pipe is very often too small to feed it.
• Cost depends almost entirely on the distance from the meter and what the pipe has to pass through. That is why the band is the widest on this page.
• Whether you need it at all depends on your existing pipe size and run, which a calculator cannot see. Assume you might.

Tankless venting kitestimated, ±52%

• Tankless units need their own sealed vent, usually through a wall rather than up a chimney. Condensing models use PVC, non-condensing need stainless, which costs several times more.

Electrical supply for whole-house electric tanklessestimated, ±57%

• A whole-house electric tankless typically needs several dedicated high-current circuits and heavy cable, and many older panels have neither the spare capacity nor the spare breaker spaces.
• The band excludes a full service upgrade, which is a separate project and is listed under what this figure does not include.

Condensate drain or pumpestimated, ±60%

• Heat pump and condensing units produce water that has to go somewhere legal. A gravity drain is cheap; a pump plus tubing is not.

Haul away and dispose of the old unitestimated, ±50%

• A steel tank full of scale is heavy and most transfer stations charge to take it. Some installers fold this into their labour and some itemise it; either way somebody pays it.

Not included in this dataset

Permit fees and inspection

Most jurisdictions require a permit to replace a water heater, and the fee varies enormously by city with no national source. Excluded from every figure on this site and stated rather than averaged. Expect tens to low hundreds of dollars.

Electrical panel or service upgrade

If your panel has no spare capacity for a heat pump or electric tankless, that is a separate project several times the size of this one. The electrical lines here cover circuits, not a new service.

Moving the water heater to a different location

Relocating means new supply, drain, vent and possibly framing. This models replacing the unit where it already is.

Utility rebates and tax credits

Heat pump water heaters often attract them, and they can be substantial. They are excluded because they vary by utility, change without notice and would make the figure look better than what you will actually be quoted.

Water treatment, repiping and pre-existing faults

Hard water, failing supply pipe or a leaking shutoff found on the day are separate work.