Magnaflow

Alan(CaliforniaRadiant)Forbes

I've seen these old circulators on a few job in our area....usually on radiant heating since they are high head, high volume; 3 amps. This one stopped working after almost 50 years of service.

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Alan(CaliforniaRadiant)Forbes

Replacement

It can be tough to figure what kind of circulator to replace it with. This house only had one manifold and it was all 1/2" copper tubing going into the floor.

I chose a circulator with a flat curve - Taco 0010.

The job took me 2 hours last night after work (I'm slowing down as I get older); got done just in time to go vote. And yes, I know I installed the pump on the return, but this job will get a new boiler next year and I didn't want to do extensive re-piping only to rip it out later.

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Mark J Strawcutter

high head?

Did you feel that the original Magnaflow was too high head? The 0010 seems to be more of a low head, high volume pump.

I once considered it as a replacement for a B&G 100 to reduce operating cost (similar performance curves), but it draws about the same current so the savings didn't seem to be there.

Mark

Alan(CaliforniaRadiant)Forbes

The Magnaflow

must've had a steep curve since I see it on jobs with old radiant done with a lot of 3/8" copper tubing. I think it was way overkill on this job; I figure no more than 8 gpm with 8-10' of head.

When I turned the system on, there was good flow thorough the boiler, a 20* temperature differential between the supply and return, no velocity noises and the boiler fired non-stop for as long as it took me to clean up my tools and get paid.

Man, was that old pump heavy!!

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