Gents, I have the Alpha running my 2 baseboard zones and from what the read-out on the pump is saying is almost too good to believe. It says I'm using 7, yes only 7 watts and pumping approximately 2 GPM to heat the upstairs right now. I installed return line temp gauges and get a nice 22-24 degree delta T. I have the Alpha set on constant pressure speed 1. Even a Taco 007 uses about 10X that much juice ! Incredible !