How do I know what size of pump I need for a heating loop? I have two different size loops. I've found all kinds of info on head and flow rate for different pumps, but how does that translate in to the linear foot of pipe I can use?
Download the System Syzer software. It will help you calculate the given head pressures. Size the pump to overcome the highest pressure drop while maintaining the total required flow.
It's not so much a case of "You got what you paid for", as it is a matter of "You DIDN'T get what you DIDN'T pay for, and you're NOT going to get what you thought you were in the way of comfort". Borrowed from Heatboy.