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I just winterized mine...as a recent "new" owner of a used unit was concerned how the bypass thing works... Looking at mine I have the same congifuration, 3-way valve at bottom which is cold inlet side, guessed there might not be a "check-valve" as it must not be external so left heater "full" during winterizing procedure.
1) Turned 3-way to point towards bypass.
2) Hooked up Antifreeze bottle to extra inlet hose for water pump.
3) Opened 3-way inlet valve to point toward antifreeze bottle.
4) Turned on water pump.
5) Opened each faucet valve, while montoring bottle for volume, and waited for "pink" fluid.
6) When all had shown "pink", turned off water pump.
7) Pulled Anode rod, and allowed hot water tank to drain completely...no pink fluid...hmmm, maybe it has a check valve internal?
*** Now my issue, I have an extra line set that has not been winterized...seems to be an extra "Hot" feed that would support a washer? There is an inlet pipe that is capped off, and a vent loop under bathroom sink...none of this plumbing is "pink" and appears to have some fluid as there is a partial fill level point that can be seen under the bathroom sink...
Any thoughts....?
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