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Old 10-28-2010, 05:18 PM   #1
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Sizing radiant heat circulators


Hi Guys, Just put up 650 sq. ft. 2 story addition on my old house. Add. is radiant, all calculated from watts radiant pro. Not sure what pumps to use ( 2 zones). upstairs is 2-160' loops 1/2" pex with 3/4" S&R about 50' long. Downstairs 2-300' 1/2" loops, 3/4" S&R. Manifolds are in room with adjustable flow control. 2nd flr looks like .4 gpm and .5 head . Not sure about 1st flr, comp crashed and i lost info. I was thinking taco 00RIFC's set on low. What do you think, Thanks!

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Old 10-28-2010, 07:23 PM   #2
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I think your forgetting to add in all your other pressure drops.

What water temp are you planning on using. As this effects head pressure in the pex.

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Old 10-29-2010, 09:23 PM   #3
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Watts radiant program comes up with 108 degree water for 1st floor (slab) and 93 degree water for 2nd floor.
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Old 10-29-2010, 11:11 PM   #4
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The Taco 00RIFC is more then enough pump for your loops. We are selling them 2-1 over the old standby of B&G100s. They are lasting longer with significantly less warranty issues.

Good luck.
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Old 10-30-2010, 03:46 AM   #5
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Originally Posted by Home Air Direct View Post
The Taco 00RIFC is more then enough pump for your loops. We are selling them 2-1 over the old standby of B&G100s. They are lasting longer with significantly less warranty issues.

Good luck.
Haven't sold a B&G 100 series in many years. Unless it was speced in the bid request.

So what is the GPM at 10 foot of head for a 00RIFC
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Old 10-30-2010, 10:19 AM   #6
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Haven't sold a B&G 100 series in many years. Unless it was speced in the bid request.

So what is the GPM at 10 foot of head for a 00RIFC

Looks like 1.5 - 2.5 depending on speed.
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Old 10-30-2010, 03:26 PM   #7
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He needs to get it(GPM) down, for his shorter loops. The longer ones will probably be ok.
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Old 10-30-2010, 05:59 PM   #8
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my manifolds have flow meters and balancing valves so i can set the required flow. should i look for smaller pumps. thanks
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Old 10-31-2010, 02:33 AM   #9
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As long as the 00RIFC are 3 speed. And you can use their lower speeds and not have to choke back the balancing valves too much. They are good to use.

I prefer to use the smallest possible circs. And one that are readily available at local supply houses.
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Old 10-31-2010, 02:35 PM   #10
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I'll probably go with the 3 speed taco 00r so i can fine tune it. Thanks everyone.

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