Water Heater Won't Drain
I'm replacing my 20-year-old gas water heater with a new one, but can't seem to get the old unit to drain. I shut off the gas and water supplies and attached a hose to the drain valve, turned on a few hot water taps in the house to break any vacuum, but all I get is about 5 gallons of clear water (no rust or sediment) that drains out. I can turn the water supply back on with the drain-valve open and water flows out with good pressure. In short, my water heater is acting like it only has a 5 gallon capacity. (Its a 50-gallon unit.) Any suggestions?