In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.
Solar Drainback and variable speed pumps
Finishing up a small drainback system and considering using the Taco VT solar series pumps. I have a 20 ft head, and that includes a 20% allowance for extra friction, and have used 1" supply and return. I am concerned that using the 009 at 35 ft head would "cool" my single panel during the initial 3 minute start up. I've also thought of using a smaller VT, like the 008 in series with a 007 booster in order to have less velocity at start up. The 007 dropping out after 3 minutes. Or to confuse matters, should I use a Grundfos Alpha pump in series with a 15-42 as booster and rely on pressure rather than temperature delta T? I have on hand a Goldline controller and realize I won't use it if I go w/the Taco VT series. But couldn't I use the Goldline with a Taco VDT? Any suggestions appreciated!