Word of caution......
If you have an electric hot water tank, DO NOT drain the water out of it without first shutting off the breakers to the unit. Exposed elements will burn out when not submerged in water. ALWAYS remember to refill completely before turning on the breaker.
Personally, I see no reason in DRAINING a tank. What you can do is a couple of times a year open the drain and let a few gallons of water out....(CAREFUL, it will be HOT)....without turning off any valves. This way any sediment that is built up on the bottom will come out.
This can and should also be done with gas hot water tanks, as sediment that collects on the bottom of the tank will insulate the water from the burner somewhat, causing the burner to stay on longer to heat the water.
Frank
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The Plantation in Leesburg, just south of you good people. Love being a Floridian!
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