Quote:
Originally posted by myv65
There is no reason you require a second pump simply to run a parallel loop for a radiator. All you need is an ample pump and a throttling valve in the "bypass" line. The throttling valve works a little nicer than separate pumps as you can then split the flow between the radiator loop and bypass in whatever ratio you wish. The downside is that you burn some energy in the pressure drop going over a valve, so overall efficiency takes a minor hit.
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Actually, the reason for the second pump is to avoid having to use one massively large (and expensive) pump.
As I've stated above, that radiator is so restrictive, that even a Supreme 1200 can only push 120 gph through it, and that's at the cost of a "14 foot of water" pressure drop (!). Since that pump deadheads at 15 feet, it really doesn't leave any room for anything else!
BTW, that pump already costs $100. The 2400 model costs about $125. I think that's already a bigger dent in Airspirits budget than he expected (but hey, he got a nice rad for dirt cheap!).