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I finally finished my staple up floor heat! It’s 6 loops each loop ~300’ of 1/2” pex-al-pex.
There are a couple (< 3) repair fittings on each loop.
At the design load of ~21K BTU, this gives a total zone flow rate of about:
21000/5000 = 4.2 GPM, which is an average flow rate of .7 GPM per loop,
which implies a head loss around 7 ft.
This is well within the range of an alpha 2 pump, at 4.2 GPM the pump curve is about 14-15ft of head.
If I set the pump to the “high fixed speed” setting, I’m only getting the alpha2 to display 2GPM, and it getting between .25-.5 GPM per loop.
Shouldn’t I be capable of pushing the water much much faster given this setup?
What am I missing?