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Old 03-25-2014, 05:59 PM   #1
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Circ pump questions


So the gravity fed hot water circ loop I installed in our new house is not working well enough, so I have to suck it up and install a circ pump.

Do any of you guys have one you use/recommend. Single story ranch house. 2.5 bath. 1700 sq feet. I am looking for something reliable, not cheap. and low GPM. The closest supplyhouse has a little Grundfos. I am not interested in the one from Home Depot, a watts maybe? I also saw one on the interweb made by "Laing". Said it was low flow and pretty energy efficient, so I probably would not install a timer. What do you seasoned plumbing professionals recommend?

Also, when I was looking on the internet (and even at a supplyhouse this week), people keep mentioning "head pressure". If it is a loop, is there any head pressure? Maybe an engineer can explain that to me.

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Old 03-25-2014, 07:09 PM   #2
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I like Laing. Repair is a simple cartridge replacement.
Don't forget check valves and a way to purge air so it doesn't air lock.

I replaced a Grundfos last week- It said Watts on it too. It was the retro fit style that converts your CW line to the HW return. It was only 3 years old....

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Old 03-25-2014, 08:42 PM   #3
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i used to own a motel and it had a Bell & Gossett brand circulating pump, 1/4 hp. Was super quiet and the only thing i ever had to do to it was replace the rubber motor mounts and coupling. Only did that twice in 19 years. A few drops of oil in the tubes every few months and it was pretty much trouble free. It's the only one i ever had dealings with, so i can't comment on other brands.
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Old 03-25-2014, 08:53 PM   #4
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Its one in the same Home depot, watts grundfos
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Old 03-25-2014, 08:59 PM   #5
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Best way to go Bell and gossett
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Old 03-25-2014, 09:00 PM   #6
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Its one in the same Home depot, watts grundfos
Thats the one. It went bad in 3 years- not saying that is typical though
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Old 03-26-2014, 04:06 AM   #7
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Circ pump questions


Head pressure in this case is the resistance to flow in your piping system/loop.

1/2" copper has a head pressure loss of .35' at .5GPM per 100' of length. All fittings(ells, tees, valves, etc) have an equivalent length in feet, that can make a seemingly short run, equal to 250 foot of straight pipe.

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