I am working with my heating contractor to add a low-loss header to my heating system. Since the system was originally installed with the pumps on the return lines, can they remain there, or do we need to place them on the supply lines? The heating circuit has two zones with one pump, the other pump is for the indirect hot water heater.
Second question: does anyone have an opinion if a Wilo Star S 21 would be too large for the primary pump? This is the pump currently on the house heating circuit and I'm replacing it with a Grundfos Alpha 2 and I would like to re-use it for the primary loop. The lowest speed is 60 watts, the highest is 110. I'm not sure of the GPM settings.
The boiler is a Viessmann Vitodens 100, model -WB1B-35.
Thanks.
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