Hi guys, I’m in the process of ripping out an old one pipe system and replacing it with a two pipe, feed and return. The new system will be on two zoning valves one for upstairs and one for downstairs.
Originally i wanted the system on a single stat and single zone valve... with a flow of 0.477 l/s and a 3.9m head loss (excluding loss over the boiler) I was going to use the Grundfos Alpha 1 as I liked the idea of balancing the system from the mobile app (potentially a time saver) and the option of auto adjusting flow rate as the TRVs close.
I’ve since changed my mind to a multi zone with upstairs and downstairs on separate zone valves and wondered if the same pump would be able to adjust flow automatically when the zone valves close.
If I go with the two zones, at the pump the flow is still 0.477 l/s but of one zone valve closes, the upstairs loop has a flow of 0.22 l/s with 1.5m head (excluding boiler) and the downstairs loop has a flow of 0.25 l/s with a head loss of 2.1m. Would the alpha 1 be able to reduce the flow rate enough to keep the return temp to the boiler the same no matter which valves are open or closed?
Thanks
Originally i wanted the system on a single stat and single zone valve... with a flow of 0.477 l/s and a 3.9m head loss (excluding loss over the boiler) I was going to use the Grundfos Alpha 1 as I liked the idea of balancing the system from the mobile app (potentially a time saver) and the option of auto adjusting flow rate as the TRVs close.
I’ve since changed my mind to a multi zone with upstairs and downstairs on separate zone valves and wondered if the same pump would be able to adjust flow automatically when the zone valves close.
If I go with the two zones, at the pump the flow is still 0.477 l/s but of one zone valve closes, the upstairs loop has a flow of 0.22 l/s with 1.5m head (excluding boiler) and the downstairs loop has a flow of 0.25 l/s with a head loss of 2.1m. Would the alpha 1 be able to reduce the flow rate enough to keep the return temp to the boiler the same no matter which valves are open or closed?
Thanks
