Where to connect hot water recirculation line at water heater?
I am installing a hot water recirculation system with a dedicated return line and a circulation pump at the water heater. There are two options for connecting the return line - the bottom of the water heater tank at the drain or to the cold water inlet at the top. I realize that unscrewing the drain hose bib can be a problem if it doesn't come out easily,i.e., it's only plastic and can break. If the connection is to the inlet, then an additional check valve is needed to prevent recirculation line hot water from feeding the cold lines when there is cold water demand in the house. What are the trade-offs?:)
Re: Where to connect hot water recirculation line at water heater?
Originally Posted by Gary Swart
I have looked into using the Laing method of connection, but they are the only pump manufacturer that specifies the use of the air vent near the pump (before pump if connecting to drain and after pump if connected to cold inlet). They also want the pump mounted below the top of the tank. They seem more concerned about air in the line damaging the pump then the the other pump manufacturers. Does anyone follow the advice about mounting their pump or other manufacturer's pumps below the tank top. Does anyone install the air vent (Watts FV-4M1)? To install an air scoop has to be built out of 1 1/4" pipe and a threaded fitiing put on it. My plumber said it would cost around $50 just to build the air scoop. :)