Water Heater Code Upgrade in Marysville, WA: Galvanized to Copper

The Call: A Newer Water Heater That Was Already Leaking

The water heater itself was only about four years old. On a tank that age you'd expect years of quiet service left. What we found instead was rust collecting on the lid of the heater and water weeping from the fittings right above it.

If you'd walked past it you might have blamed the tank. It wasn't the tank. It was the pipe somebody used to hook it up.

What We Found: Galvanized Steel Where Copper Belonged

Whoever installed the heater ran the line to the thermal expansion tank in galvanized steel: a galvanized tee, a short horizontal run of pipe and a galvanized elbow up into the expansion tank. Every threaded joint on it was corroded. You can see the crusty buildup where each fitting meets the pipe, and the rust stain that had dripped down onto the top of the heater.

Why galvanized fails so fast on a water heater

Galvanized pipe is steel with a thin zinc coating. Threading a pipe cuts through that coating, so every threaded joint is bare steel from day one. Hot water speeds up corrosion. And on top of a water heater, that steel is threaded into brass valves, copper and stainless flex connectors. Two different metals touching in water set up galvanic corrosion, and the steel is the one that loses.

That's why a job barely four years old already had joints that were rusting through. Left alone, those fittings only get worse, and a failed joint over a water heater means water on the floor.

The code side

Our plumber flagged it as a code problem on the spot. Washington uses the Uniform Plumbing Code, which says piping subject to corrosion has to be protected (Section 312.4) and spells out approved transitions where different piping materials join, like brass fittings or dielectric fittings (Section 605.16). Bare galvanized threaded into a brass-and-copper water heater setup doesn't meet that standard.

The Fix: Repiping the Water Heater in Copper

This one didn't need a new heater. It needed the right pipe. Here's how the job went:

1. Shut it down safely. It's an electric heater, so we killed power at the breaker, shut off the cold water supply and relieved the pressure in the tank.
2. Cut out the galvanized. Out came the galvanized tee, the horizontal pipe and the elbow under the expansion tank.
3. Rebuilt it in copper and brass. New copper pipe with a brass tee and a brass elbow, with the threads sealed. Brass and copper get along, so there's no galvanic pair left to eat the joints.
4. Reconnected the expansion tank on the new copper so it can keep absorbing thermal expansion the way it's supposed to.
5. Refilled and tested. Filled the tank, bled the air out of the lines, restored power and checked every joint under full pressure for leaks.

A small job, honestly. But when an installation is out of code, the fix is what protects everything connected to it. It's the same kind of material swap we do on a bigger scale when we repipe a whole house.

The Result: Same Tank, Right Pipe, Warranty Intact

Here's where the homeowner ended up:

• Leaks fixed. Every joint above the heater is new and tested under pressure.
• The corrosion is gone. The galvanized is gone, and so is the mismatched-metal setup that was eating it.
• Up to code. The installation now meets the plumbing code it should have met on day one.
• Warranty still intact. Most tank manufacturers only cover a water heater that's installed to code, and damage from a bad install usually isn't covered. Fixing the piping protects the warranty on a heater that has plenty of life left.
• No new heater to buy. The tank was fine. Catching this early kept it that way.

That's the kind of thing we'd rather catch on a service call than after a fitting lets go. It's also why homeowners around Snohomish County leave us the reviews they do: we tell you what we found and why it matters, not just what we replaced.

Is Your Water Heater Plumbed in Galvanized?

Take a look at the pipes on top of your tank and around the expansion tank. Call a plumber if you see any of these:

• Dull grey threaded pipe and fittings instead of copper, PEX or flex connectors
• White, green or rusty crust built up where fittings join the pipe
• Rust stains or drips on the lid of the water heater
• Damp spots or water around the expansion tank connection

Any of those are worth a visit from our water heater team. If galvanized is running through the rest of the house too, our guide to repiping a house explains what to look for and when it's time.