[Greenbuilding] Radiant heat boiler

[William Updike]

Maybe a boiler from Monitor products would work.  They
sell high efficiency tankless (they claim 92-97
percent and up to 142,000 btus I think) and backup
indirect tanks.  Has anyone installed these?  

http://www.monitorproducts.com/mzboiler/products/mz/index.html

Cheers,
Bill

--- David Seth Melchert <dmelchert at earthlink.net>
wrote:

> We have started a large residential remodel in
> Orinda, CA. The 2,800 sf 
> house will be heated with radiant floor heat. We
> were planning to use a 
> Baxi Luna 330 instant heater for combined radiant
> and domestic hot 
> water. I really love the Baxi Luna for its compact
> design and simplicity 
> of installation, not to mention its general high
> efficiency.
> 
> However we are concerned about its capacity to serve
> the demands of a 3 
> bath house. The homeowner consulted with a supplier
> who suggested that 5 
> gpm, delta 70 degrees is the minimum required, more
> than the 144,000 
> BTU's the Baxi Luna provides. Baxi has a new Modula
> supplemental tank 
> that holds 21 gallons and serves as a kind of buffer
> for temporary high 
> demands. My homeowner is concerned this will not cut
> it. They are edging 
> towards having separate heat sources, such as a
> Noritz or an efficient 
> large tank for DHW.
> 
> Here are my questions: how many gpm should we figure
> for hot water needs 
> at any one time, and how often might a family of
> four run into 
> insufficient hot water using the Baxi? Would you
> agree that providing 
> separate heat sources for radiant and DHW would be
> the best path?
> 
> Thanks
> 
> Seth Melchert
> Oakland CA
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