Water Heater Expansion Tank Diagram
A properly placed expansion tank keeps pressure spikes from dripping the relief valve and wearing out a water heater early. ArcSite's water heater expansion tank diagram shows where the tank goes and what it's protecting.
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Key Features
This water heater expansion tank diagram includes:
- Expansion tank on the cold water supply line
- Two optional tank locations, including a horizontal mount
- Backflow preventer and shutoff valve on the incoming supply
- Pressure gauge on the cold line
- T&P relief valve with a discharge line
- Floor drain below the discharge line
- Flow arrows from supply to system
The backflow preventer is what makes this tank necessary: once it closes the house off from the main, heated water has nowhere to expand except into the tank.
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Why Use a Water Heater Expansion Tank?
Many local codes require an expansion tank wherever a backflow preventer or check valve turns the plumbing into a closed system. ArcSite lets you mark the tank, valves, and discharge route on this diagram so an inspector sees your full setup on one page.
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FAQ
Yes. The diagram shows an optional horizontal position, with the tank supported from above so its weight isn't hanging on the pipe.
Yes! You can drag the tank to either optional location in ArcSite, or anywhere else on the cold line.
No. ArcSite runs on iPad and Android tablets as well as Windows, so you can draw right at the water heater instead of back at a desk.
