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From:In Reply to: Hot Water Heater Maintenance posted by Mark Kenney on December 31, 1999 at 18:21:51:: I would like to know if there is any service that I can perform as a homeowner to improve the capacity and response of my 7 year old gas 40 gallon hot water heater. SHoudl I turn off the water supply and drain under gravity to remove any scale? or should I drain under pressure from the bottom valve or should I drain it at all? It seems to have lost some capacity.If you have a substantial build up of scale in the tank then it could reduce the capacity or your tank. I have flushing instructions on my website if you want to take a look.Bill