[Greenbuilding] tankless and radiant floor heat

[Carmine Vasile]

Sacie: Tell him to try adding automatic  air eliminater valves at the heater's inlet and outlet. That's what I had to do. Get a good one like Spirovent; not sold in my nearest Home Depot.
Carmine 
 


Date: Wed, 9 Feb 2011 07:50:02 -0800
From: cascadeshc at gmail.com
To: greenbuilding at lists.bioenergylists.org
Subject: Re: [Greenbuilding] tankless and radiant floor heat

Why do some tankless WH manufacturers warranty their units for closed systems only?


On Mon, Feb 7, 2011 at 6:13 PM, Sacie Lambertson <sacie.lambertson at gmail.com> 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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-- 
Kurt Jensen
Cascade Small House Company LLC
www.cascadeshc.com
541.747.8925
 		 	   		  
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