Outdoor Wood Furnace Info
All-Purpose OWF Discussions => Plumbing => Topic started by: Ridge on August 13, 2016, 10:24:32 AM
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What would the next size pump be, looked at a 26-99 but that's like double the flow, would like something in middle, we added 2 zones last year for a total of 6 and now added another.
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A three speed 26-99 running on low is roughly a step above a three speed 15-58 running on high.
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You could get something like a 26-96 but really no point not going with a 26-99 and running on a lower speed.
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What is the power draw differance from the 15-58 (mine is a single speed) and a 26-99 on low?
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According to the ratings, a 15-58 is 87 watts on high and 26-99 is 150 on low and 197 on high.
You could just get another 15-58 and put it in series. Could probably run it on low or medium and get the same flow.
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What about the alpha pump, it looks like it moves more gpm? And looks like it would use less power, with as many zones as we have the pump runs alot, always one needing heat
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The Alpha is just slightly smaller than a 15-58. You could use one of them in series with your existing pump.
You need to look at both head and GPM ratings.
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My two cents, step up to the 26-99 and keep your 15-58 in case of a emergency, the slight step up in watts used shouldn’t break the bank.
Another good option, and I wish Grundfos would offer it, put replace the 15-58 with a Taco Delta T pump then no matter how many zones are calling for heat, you can always keep your Delta T where you want it. I’m running one for my house at the moment, heat load can very wildly, any combination of DHW, heat, snow melt, or all three at the same times can drastically vary how much flow is actually required, so far the Taco Delta T has worked neater than a skeeters peter.
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I'm running a 26-99 on low. I don't notice much difference in my electric bill in the winter. It is more flow than I need right now, but it's what I had and it works.