Mike Lamb Posted February 19, 2016 Report Share Posted February 19, 2016 Does it make any sense to install an expansion tank near the water main? The WH is located about 10' away. There are no back-flow valves at the water supply and the main heat is forced air. Click to Enlarge 28.74 KB Quote Link to comment Share on other sites More sharing options...
mjr6550 Posted February 20, 2016 Report Share Posted February 20, 2016 It would still function as an expansion tank, but it is not a proper location assuming that the water heater has a shut-off valve in the supply. My only other thought is that they were trying to deal with a water hammer issue. Quote Link to comment Share on other sites More sharing options...
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