Hot water convection return loop plumbing?
Posted by DavidH on October 19, 1999 at 07:57:55:
I looked at another house done by my plumber, and he did a hot water convection return loop as follows. The supply lines to upstairs are 3/4". He rean a 1/2" return line down to the water heater. He then added a connection to the hot water heater drain spigot and another spigot with a tee and tied the return line into the tee. Questions: is this "kosher" to use the drain line for this purpose? I see no one-way valve in the return line, this seems very important so that when hot water is used, you don't get sediment from the drain line sucked up through the return line.