Water Heater Replacement Cost

What drives the cost

• Tank vs. tankless: tankless units cost more to install — especially when converting from a tank — but last longer.
• Fuel type: gas, electric, and heat-pump (hybrid) models differ in unit price and hookup work.
• Capacity: larger households need bigger tanks or higher flow-rate tankless units.
• Code upgrades: expansion tanks, seismic straps, drain pans, and venting changes are often required at replacement time.
• Location and access: attic, crawlspace, or tight-closet installs add labor.
• Permits and disposal: most jurisdictions require a plumbing permit; old-unit haul-away may be billed separately.

Typical replacement process

1. Assessment of the existing unit, fuel type, and venting.
2. Written quote covering the unit, labor, code upgrades, permit, and haul-away.
3. Draining and disconnecting the old heater.
4. Setting the new unit, connecting water, fuel, and venting.
5. Pressure/leak testing and temperature setting.
6. Permit inspection where required.

Choosing a plumber: checklist

• Licensed plumber (or licensed contractor where your state allows).
• Quote itemizes the unit model, code upgrades, permit, and disposal.
• Pulls the permit themselves rather than asking you to skip it.
• Explains warranty terms for both the tank and the labor.
• Offers a clear timeline — most swaps are same-day once quoted.