[Greenbuilding] tankless and radiant floor heat

[Clarke Olsen]

156*f is too hot for PEX! The problem is not with the temperature,  
it's with the circulators. Or, with air in the system.
Clarke Olsen
373 route 203
Spencertown, NY 12165
USA
518-392-4640
colsen at fairpoint.net




On Feb 7, 2011, at 9:13 PM, Sacie Lambertson wrote:

> Our son in Seattle,lives in a house with a 2007 installed radiant  
> floor heat on the main floor, baseboard heat in the basement and  
> 2nd floor.  Three zones.   The water heated for the system is  
> powered with a Takagi tankless. Open system.   It is not working  
> right.   Has apparently required a bleeding numerous times within  
> the week period after he moved in.  Plumber called initially to  
> show him how to bleed.  This guy told him set the Takagi for 156+  
> degrees----'only way it'll heat up those floors"    or something  
> like that.    Pex tubing.
>
> I believe his system has a small holding tank connected with it.
>
> This is Seattle.  ANy suggestions from this group about what goes  
> here?   I've googled anything I can think of connected radiant,  
> tankless and bleeding/air, but find nothing remotely useful.  Lots  
> of advice though.  Comments about the high heat admonition too.   
> Never heard of this.
>
> We have a radiant floor system ourselves, but heated with a DHW  
> heater.  We've bled the system one time only, at the beginning.
>
> Something gives here.
>
> Thanks in advance,  Sacie
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