Quote:
quote:Originally posted by awaywego
The back flow keeps antifreeze from going into the water heater if you winterize. You can buy a brass replacement for it at some dealers.
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Ummm, ...the HWH by-pass valve in the convenience center is what keeps RV antifreeze out of the water heater. On Edit: Well, poop! I hate it when I'm wrong! (remove foot from mouth
) The check valve is also part of the HWH by-pass equation that keeps anti-freeze out too. Didn't think of it as such, as my old rig had three manual valves to do the deed instead of just one like we have now. Sorry, awaywego.
The check valve on the outlet of the water heater helps keep hot water (edit: ....and anti-freeze while in by-pass configuration
) from backing up into the tank. Without one, turning on the cold at a faucet or flushing the toilet causes a temporary pressure drop and draws hot water backwards out of the tank until the line pressures are equalized, if there is a tee to another faucet in the cold supply line very close to the water heater inlet, it can even output hot water through the cold side of that faucet.
In fact, some put the check valve on the cold inlet to the HWH oriented so the check valve only allows cold water
into the HWH, instead of at the hot outlet oriented so that it only allows hot water
out of the tank. Either option makes for a one-way flow from the HWH.