Water Heater Replacement Cost: What a Fair Quote Looks Like

Glenwood Springs, Colorado requires a permit for any water heater replacement, including emergencies, and Ohio’s code requires approval before replacing plumbing equipment. Home Depot says permits are required on most replacements. Rules vary; one plumber commenter said like-for-like swaps need none where they work.

Eagle, Colorado charges $65 plus a $25 issuance fee, and Delaware County, Ohio $60 plus a $75 change-out fee plus the state’s 1% and $0.75. A permit line far above that is a question to ask.

Model code requires thermal expansion control where a check valve, pressure-reducing valve or backflow preventer closes the system. Some places go further: Utah’s adopted code requires an expansion tank on every water heater.

The residential code calls for a drain pan where a leak would cause damage, which is decided by where the heater sits, not its type or age. This rests on a secondary explanation of the code, so check your local version.

State law requires every new and replacement residential water heater up to 120 gallons to be braced, anchored or strapped against earthquake motion.

A San Antonio owner got $4,200 and $3,700 from large chains, $2,500, and $1,800 twice from smaller firms for one job. In Cary, North Carolina, a membership firm offered $2,300, $2,800 and $3,200 tiers that differed only in warranty length, against about $1,200 locally.

St. Louis owners paid $1,400 through Lowe’s against a $2,500 independent quote, and $1,800–$1,900 through Home Depot. In Seattle, though, a Lowe’s contractor quoted $3,500 for a job done elsewhere for $2,500.

From search excerpts of their pages: Home Depot says its installers haul away the old unit and obtain required permits, with code upgrades extra after an on-site inspection. Lowe’s installs like-for-like on the same power source through independent installers, with the gas installation kit sold separately.

Every thread with several quotes for the same job showed a spread of $1,500 or more. Some firms charge just to come out and quote, so ask first.

Water pooling from the tank itself means corrosion, and Rheem says replacement is the only safe fix. Leaks from fittings or valves are different and usually repairable.

A.O. Smith says to replace a unit more than 10 years old that leaks or runs erratically, and Rheem suggests planning replacement around year 10.

Rheem says that if a repair costs more than half a new unit, replacing is almost always better, and that repair generally makes sense under about 6–8 years with no corrosion. No independent source states the rule.

Replacing on a weekday avoids the $200–$500 emergency premium and gives time for a second quote; the emergency attic job in the evidence drew quotes from $2,200 to $4,274.