Water Heater Replacement Cost Calculator

What a Water Heater Costs Installed

The unit itself is often the smaller half of the bill. A builder-grade 50-gallon tank sells for $500 to $900 at a big-box store, but the installed price includes hauling out the old unit, new supply connections, a licensed plumber's labor, and whatever code upgrades your municipality now requires that it didn't when the old tank went in. Expansion tanks, drain pans with piped drains, seismic strapping, and updated venting each add real money, and inspectors do check for them.

Why the Tankless Water Heater Cost to Install Runs Higher

A first-time tankless conversion is really two projects: removing a tank and rebuilding the fuel and venting infrastructure around a very different appliance. Most gas tankless units demand a 3/4-inch gas line, and plenty of older homes only have 1/2-inch runs to the utility closet, so the line gets upsized. Venting changes too. Condensing units need dedicated PVC intake and exhaust runs through an exterior wall, not the old metal flue. Add a condensate drain, an isolation valve kit for annual descaling, and an electrical outlet for the control board, and the labor side alone can pass $1,500. The consolation: once that infrastructure exists, the next tankless swap 15 or 20 years later costs far less.

• Hard water regions (much of the US Southwest and the Canadian Prairies) need a descaling flush roughly once a year, or mineral scale will choke the heat exchanger and void the warranty.
• Electric whole-home tankless units skip the gas line work but can draw well over 100 amps across multiple breakers, which forces a panel upgrade in many older homes.
• Recirculation Pumps: If the kitchen tap takes a minute to run hot, a recirculation loop fixes it, but it adds $500 to $1,100 to the install.

The Code Upgrades Nobody Budgets For

Plumbing codes tightened in most jurisdictions over the last two decades, and a replacement is when you pay the difference. If your old tank has no thermal expansion tank, no drain pan, or venting that no longer meets clearance rules, the plumber is required to bring the installation up to current code, not just match what was there. Budget $150 to $600 for this bucket on a typical swap. It stings, but an expansion tank is cheap insurance against pressure damage to fixtures, and a piped drain pan is the difference between a $40 part and a flooded finished basement.