Quote:
Originally Posted by shakran
a caveat to flushing the water heater. If it's an older heater (4+ years) and has never been flushed, then you shouldn't flush it, because the crap that's already in the bottom of the tank will jam the drain valve, and you'll never stop the leak unless you disassemble the whole thing.
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Partially true. Sometimes, repeated flushing, or back flushing can clean the valve seat. When that fails, I install a brass cap with gasket on the garden hose outlet. I keep them on the service truck for evil water heaters and boiler drains.