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Author Topic: OWB Pump Issues  (Read 409 times)

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Offline ct_homeowner

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OWB Pump Issues
« on: January 28, 2019, 06:51:57 PM »
Good evening - 

I have a Polar G2, first year I've owned it. Really efficient, but I just had the pump (Grundfos UP26) go out for the second time. Customer service at Polar has been no help and even refused to honor the warranty on the first pump, but that's another issue.

I'm scratching my head trying to figure out why this might be happening. I am running a 50/50 antifreeze mix, and the water is hot, but I haven't had any boilover or anything like that. The circulator pump inside the house is running the same liquid through and has been running just fine. 

Anybody have any ideas what it might be? Thank you!

Offline E Yoder

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Re: OWB Pump Issues
« Reply #1 on: January 29, 2019, 02:01:02 AM »
This is on the back of the outdoor furnace, correct? Do you have a picture of how it's mounted? How far is it pushing, what size piping?
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Offline thecfarm

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Re: OWB Pump Issues
« Reply #2 on: January 29, 2019, 05:54:59 AM »
I had a issue with pumps. The guy that installed it put too big of a pump on it. Seem like the water was coming back to the pump and making the fins turn faster. Sounds good,dropped down a few sizes and all is good and has been good for 10 years now. I had the Taco13 dropped down to an 8 and no problems.
Model 6020-20hp Manual Thomas bandsaw,TC40A 4wd 40 hp New Holland tractor, 450 Norse Winch, Heatmor 400 OWB,YCC 1978-79

Offline ct_homeowner

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Re: OWB Pump Issues
« Reply #3 on: January 29, 2019, 09:11:43 AM »
This is on the back of the outdoor furnace, correct? Do you have a picture of how it's mounted? How far is it pushing, what size piping?
That's correct - it is on the back of the furnace and just circulates water there - there is another pump inside the house as well (no problem there). It is 1 1/4" piping, picture attached. 

 

Offline ct_homeowner

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Re: OWB Pump Issues
« Reply #4 on: January 29, 2019, 09:12:39 AM »
I had a issue with pumps. The guy that installed it put too big of a pump on it. Seem like the water was coming back to the pump and making the fins turn faster. Sounds good,dropped down a few sizes and all is good and has been good for 10 years now. I had the Taco13 dropped down to an 8 and no problems.
That's great. Thanks very much. Yeah, I always wondered why there was such a powerful pump back there. 

Offline buckgrunt

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Re: OWB Pump Issues
« Reply #5 on: January 29, 2019, 09:32:07 AM »
I have a 10-yr old CB 2300 and I have 1 TACO pump circulating the water to and from my plate exchanger, which is inside the house.  You mentioned you have another pump inside the house.  I may not be following you, but why do you have 2 pumps circulating the same loop ? 

Offline Rebarb

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Re: OWB Pump Issues
« Reply #6 on: January 29, 2019, 01:34:17 PM »
Only reason for the use of 2nd pump would be a Hydronic system or supplying a 2nd exchanger to heat an additional building or garage tied into it's own thermostat. 

OP, curious why the use of 50/50 mix which does put more strain on the pumps and reduces heat transfer.....less efficient. 


Offline ct_homeowner

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Re: OWB Pump Issues
« Reply #7 on: January 29, 2019, 03:55:27 PM »
Only reason for the use of 2nd pump would be a Hydronic system or supplying a 2nd exchanger to heat an additional building or garage tied into it's own thermostat.

OP, curious why the use of 50/50 mix which does put more strain on the pumps and reduces heat transfer.....less efficient.
On the 2nd pump - that is not correct with this model. This model has one pump in the unit itself, but it does not push fluid to the to the house. It merely circulates fluid from the jacket to the reservoir in the back which then feeds up to three lines. A second pump is needed to bring the fluid into the house. If you wanted to use a second line (unit has three), you would need a third pump.
On the 50/50 - because sometimes for work I need to leave for a week and my wife refuses to fill the boiler. Then we run heat pumps (put in for AC) in the house.

@buckgrund - I think I answered your question here too. It's a quirk of this model that you need one circulator pump on the boiler and then an additional pump for every loop off of it. 

Offline E Yoder

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Re: OWB Pump Issues
« Reply #8 on: January 30, 2019, 03:47:44 AM »
Is that the whole model # (UP26)?
 It seems plenty big (high head), I wonder if it's cavitating. I'd think something smaller like a 15-58 would be plenty, but I'd also think they'd size it correctly from the factory. So I might be wrong.
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Offline ct_homeowner

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Re: OWB Pump Issues
« Reply #9 on: January 30, 2019, 09:27:55 AM »
Thanks everybody. Looks like the UPS15 should fit right in where the UPS26 was - hopefully the lower power should do the trick. Will also save me $200 on a new pump. Will try that. Really appreciate your time. 


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