[Greenbuilding] tankless and radiant floor heat

[Kurt Jensen]

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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