Do water heater expansion tanks need extra support besides the pipes?
Plumbing codes and inspectors often give conflicting advice on whether an expansion tank can be supported solely by its copper piping or if it requires a separate wall mount. This leaves DIYers uncertain about proper installation, risking unsupported weight stress on the water heater connections.
Core Friction Pattern
Analysis of 3 peer accounts across online developer and community forums reveals that “Do water heater expansion tanks need extra support besides the pipes?” repeatedly surfaces due to edge-case mismatches between standard defaults and real-world environments. Standard troubleshooting frequently falls short, compelling practitioners to develop custom workarounds.
+5 alternative community-tested workarounds cataloged below.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
Found another way around this?
Share your steps and trade-offs so fellow engineers don't have to reinvent the wheel. No account required.
Do water heater expansion tanks need extra support besides the pipes?
- 1Using a brass expansion tank teeDid this help you?
- 2Adding a service valve close in lineDid this help you?
- 3Mounting the tank facing downwardDid this help you?
- 4Eighty-elbowing the expansion tank over to the wall for a separate mounting bracketDid this help you?
- 5Emailing photos directly to the plumbing inspectorDid this help you?
- 6Using brass fittings for support if strapping is absentDid this help you?
In their words
Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.
“Dry fitting all the copper for this electric water heater. CA approved to mount the expansion tank in this fashion?”source ↗
“Not my picture, but yes im planning on doing it like this.”source ↗
“Really wish the inspector would respond to me bc it seems convoluted to elbow the tank over to the wall no?”source ↗
“One plumber said this is fine since it’s stacked over the pipe but idk”source ↗
“This expansion tank is upside down. Second the tank should be supported with something besides the pipes.”source ↗
Where this came up
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