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dairyboy 11-22-2005 07:32 PM

Heated Sidewalk
We have installed a Heated Side walk using PEX radiant heat tubing.
This is a Closed Loop circut.
WE are having problems however with heat.
We have Bleed the Lines and are 99.9% there are no air blocks.
The outgoing pipe is hot. but the retun is cold. we can Hear the Water running through the circulator(Taco 007)
We are using a Domestic 40 Electric hot water heater. The Water heater has been tested the elements and theromstats have tested good.

One possible Problem may be the Heater can not keep up. We have shut offs before and after the circulator and we have closed them now to just let a small amount of water through hoping that that might help the heater recover.

The other thought thous is that the circulator is capable of up to 20 GPM.Ąt_category=52&Produc t=10 if that is possible seems like every 5mins we should circulate the entire hot water heater. If the water is traveling that fast seems like it would not get a chance to get cold.

Any Input or ideas?


K2eoj 11-22-2005 08:26 PM

I'm guessing that returning cold is normal. 33 degrees will melt snow. HS.

dairyboy 11-22-2005 09:39 PM

Yes one important fact. We ran 600 Ft of 1/2in pex plus approx. 40 of pipe to the heater.
There are 4 loops in the concrete.

The one I rember seeing as a kid... the side walk actually steamed.


K2eoj 11-22-2005 10:43 PM

Yes i would think 600 ft. of pipe would lose alot of heat.> I think that overheating the concrete would be a waste of energy. Hopefully someone will come along here and get us straightend out. HS.

Teetorbilt 11-23-2005 09:14 PM

I have the opposite problem. Now I'm thinking about a cooled pool deck. LOL

We're plenty cool right now though, second night into the 40's.

dairyboy 11-25-2005 09:35 AM

We got to test the system here in pa yesterday and it failed miserably. What we are concluding is the electric hot water heater does not have the out put to heat the side walk let alone matain the hot water.
What we need to know is what we should use to heat the water and how many BTU. something electric would be great. but will probably have to be gas.


NateHanson 11-27-2007 02:04 PM

I'd think about a tankless heater if you've having trouble keeping up with the load. Definitely gas if you have the option.

This sounds like a pricey way to avoid shovelling! :)

handy man88 11-27-2007 02:23 PM

Where does all the water go after the snow is melted? Does it pool somewhere and freeze?

Clutchcargo 11-27-2007 02:23 PM

63 Attachment(s)
Do you have a dedicated water heater for the snow melt?
If the heater can't keep up then the output would be getting cold too.

How big is the pipe to the manifold?

I'm thinking the water isn't moving fast enough. 600' through 1/2" pex is a long way for a taco 007. You are probably down to less than 1/2 of the GPMs as listed for the pump.

Are you running the system with antifreeze?

NateHanson 11-27-2007 02:25 PM

Oops. Just noticed that last post has a date of 11/25/2005. I'm guessing this guy has already been warming his morning coffee on the sidewalk for quite some time.

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