You'll want to be extra careful with that valve removal...I just replaced the 12 gallon water heater (tank leaking)....to the tune of $583...and I got a deal.
In the old tank I found the anode rod was completely gone...I'll now make that an annual inspection item. But just for grins, I cut the tank open and found it relatively free of deposits (even after spending winters in Yuma)...with the exception of the heating element, which was completely crusted over. This no doubt caused the heater to function less efficiently.
Regards
Gemstone
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No longer on the road.
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