Hi forum,
I will be attaching a heater to my system and will add (2) 3-way valves to the system by way of "H" set up. I was under the assumption that a check valve would be needed prior to the SWG but I am being told that if I am adding the 2 valves a check valve is unnecessary. This would support if I was only adding one 3 way valve a check valve would be needed to prevent back flow. Does the board agree?
I will be attaching a heater to my system and will add (2) 3-way valves to the system by way of "H" set up. I was under the assumption that a check valve would be needed prior to the SWG but I am being told that if I am adding the 2 valves a check valve is unnecessary. This would support if I was only adding one 3 way valve a check valve would be needed to prevent back flow. Does the board agree?