[Greenbuilding] problems with radiant heat and tankless

Clarke Olsen colsen at fairpoint.net
Thu Feb 10 15:23:11 CST 2011


You can have air in the lines which allows water to pass. This could  
be pushed out with a strong surge of fluid,
or be absorbed in the water over time. A flow too low to activate a  
heater sounds pretty low.
Clarke Olsen
373 route 203
Spencertown, NY 12165
USA
518-392-4640
colsen at fairpoint.net




On Feb 10, 2011, at 3:58 PM, Sacie Lambertson wrote:

> This makes sense to me if there appears to be no leaks in the  
> system.   System installed in 2007.  Comments appreciated.  Sacie
>
> " I've been piecing together some other aspects of this system with  
> my plumber. I am moving toward an electrical or mechanical problem  
> with the pumps. I bled the zones last night and found no air in any  
> of them.
>
>  My next step is to do amp tests on all pumps.  They all seem to  
> work intermittently, which I've seen some discussion of in Taco  
> pump forums. The insides of these pumps can be replaced. The flow  
> through these pumps appears to be just enough to push water through  
> the lines. If there are any inefficiencies in the pumps, then there  
> isn't enough flow through the heater to turn the burner on."
>
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