Jim C.
New Member
I'm putting in a hot water recirculating pump with a dedicated line. The plan is to control it with Smart Recirculation Control's model 32. The unit mounts between the water heater and the pump and cycles the pump by detecting a change in the water temperature, which is achieved by simply opening the valve then closing it then reopening it.
The water heater (conventional electric tank type) is about 55 pipe-feet from the farthest valve which includes about ten feet of vertical.
My plumber suggests installing a Grundfos Comfort 10-16 A PM BU/LC pump rated at 2 gpm. The one I've found is a Grundfos UP 15-10 SU7P/TLC rated at 6 gpm. From what I gather, that 55' of pipe holds about 1-1/4 gallons of water so my plumber's pump would take about 35 seconds for the water to make it to the far end while mine would take about 12 seconds. Why would I go with the 2-GPM-rated one and not the 6-gpm one? Or is there more to it than simply GPM?
Second, both of our pumps have more bells and whistles than I need. All I need is an appropriate pump, preferably one with either a stainless steel or bronze body, so any suggestions you might have would be appreciated.
Thanks in advance.
The water heater (conventional electric tank type) is about 55 pipe-feet from the farthest valve which includes about ten feet of vertical.
My plumber suggests installing a Grundfos Comfort 10-16 A PM BU/LC pump rated at 2 gpm. The one I've found is a Grundfos UP 15-10 SU7P/TLC rated at 6 gpm. From what I gather, that 55' of pipe holds about 1-1/4 gallons of water so my plumber's pump would take about 35 seconds for the water to make it to the far end while mine would take about 12 seconds. Why would I go with the 2-GPM-rated one and not the 6-gpm one? Or is there more to it than simply GPM?
Second, both of our pumps have more bells and whistles than I need. All I need is an appropriate pump, preferably one with either a stainless steel or bronze body, so any suggestions you might have would be appreciated.
Thanks in advance.