If your roof is leaking, "they" aren't even going to look at the water heater.
The reason for three valves is to control the flow of water. Your goal is to force ALL the incoming water to enter the heater and the ONLY water going to the faucets to be hot.
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2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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