520 df gives very little hot water with municipal water

 
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Post by coaledsweat » Tue. Dec. 12, 2017 10:02 am

Why would there be temp difference between the well and muncipal water? If anything, I would expect the city water to be warmer.


 
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Post by McGiever » Tue. Dec. 12, 2017 10:18 am

coaledsweat wrote:
Tue. Dec. 12, 2017 10:02 am
Why would there be temp difference between the well and muncipal water? If anything, I would expect the city water to be warmer.
There just is, :)
No benifit to debating this aspect of OP situation....it is a Fact. :)

As I mentioned earlier, I have both the same water situations here too, so I fully understand his situation.

 
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Post by lsayre » Tue. Dec. 12, 2017 10:24 am

Well water is deeper under ground than municipal pipelines, so could easily be warmer. Municipal water pipes merely must be kept below the frost line.
Last edited by lsayre on Tue. Dec. 12, 2017 10:25 am, edited 1 time in total.

 
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Post by coaledsweat » Tue. Dec. 12, 2017 10:25 am

The only difference I see is he had a storage tank with the well water which would temper it somewhat. If possible, I would return the tank to service. There is no doubt in my mind the water entering the house is at the same temperatue or very close with either supply.

 
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Post by lsayre » Tue. Dec. 12, 2017 10:26 am

I could see municipal water being perhaps as much as 10 degrees colder. More than that would be a strain. At 10 degrees colder it would require 12.5% more energy output from the boiler for the example I provided above.
Last edited by lsayre on Tue. Dec. 12, 2017 10:29 am, edited 1 time in total.

 
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Post by Rob R. » Tue. Dec. 12, 2017 10:29 am

I would just start with the mixing valve. :shifty:

 
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Post by McGiever » Tue. Dec. 12, 2017 10:33 am

Are there mixing valves that work to increase heat?...I want one! ;)


 
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Post by McGiever » Tue. Dec. 12, 2017 10:49 am

lsayre wrote:
Tue. Dec. 12, 2017 10:26 am
I could see municipal water being perhaps as much as 10 degrees colder. More than that would be a strain. At 10 degrees colder it would require 12.5% more energy output from the boiler for the example I provided above.

I have both and see times better than 15 degrees difference and that is with the constant well temp locally of 54 degrees, please guys!

I've run a water source heat pump for 21 years here and know my water temps that I use. I'm not Doubting the OP situation.:)

 
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Post by Rob R. » Tue. Dec. 12, 2017 11:27 am

McGiever wrote:
Tue. Dec. 12, 2017 10:33 am
Are there mixing valves that work to increase heat?...I want one! ;)
Of course not, but if it got stuck open after getting a shot of 180 degree water out of the coil, it will over temper the subsequent flow.

 
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Post by lsayre » Tue. Dec. 12, 2017 11:28 am

Ground water temperature by region:

http://www.builditsolar.com/Projects/Cooling/US-g ... -temps.gif

I live right about on the 52 degree line. The OP seems to be at about 53 degrees for his well water. His municipal water could run as cold as 37 degrees perhaps? For that case the difference between well and municipal = 16 degrees.

 
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Post by coaledsweat » Tue. Dec. 12, 2017 1:12 pm

lsayre wrote:
Tue. Dec. 12, 2017 11:28 am
The OP seems to be at about 53 degrees for his well water. His municipal water could run as cold as 37 degrees perhaps?
I have a hard time believing that kind of difference in temps. I monitered incoming city water temperature for 16 years, it came in at 52° and never varied more than a degree. I can't think of an instance where it was 2° off from 52°. Just checked my well water after letting it run a long very long time, 48°.

 
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Post by Pacowy » Tue. Dec. 12, 2017 2:03 pm

Not sure why we're still talking about this. The OP said the well water was tempered in a (presumably indoor) tank. Even if the city and well water were exactly the same temp, the well water would be warmer when it was used for DHW.

Regarding the supposed uniformity of city water temp, it might make sense if the city draws from wells. Around here, my understanding is a lot of municipal water comes from surface reservoirs, where the water temps routinely plummet after early October. From nonscientific personal experience, I seriously doubt the tap water here is anywhere near the same temp all year round.

Mike

 
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Post by Lightning » Tue. Dec. 12, 2017 3:47 pm

Neat link Larry, I've measured mine to be right close to 50 degrees but my well is shallow. I have water at 16 feet and have filled my swimming pool with it lol.

 
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Post by Lightning » Tue. Dec. 12, 2017 3:52 pm

ODDSNENDS4U wrote:
Mon. Dec. 11, 2017 5:42 pm
Also had storage tank on well and now comes from main line right into furnace. Any help out there?
Is the storage tank gone? Why not use it again?

 
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Post by lsayre » Tue. Dec. 12, 2017 3:56 pm

I would think that a DF 520 should be capable of delivering 3.5 to 4 GPM of hot water from its DHW coil. I agree with the others here who have suggested that it needs to be inspected for internal mineral deposit buildup. I hope your municipal water does not contain more minerals or alkalinity than your well water did.


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