[Greenbuilding] Radiant heat boiler

[Alchemy Construction Inc]

Why not a Boiler and an Indirect tank.  One heat source.  One vent.  94% 
Efficiency.
The new Fine home building mentions some benefits of indirects.
We have Both boilers and Baxi's in.
The Baxi's are quiet but figure out your GPM load.
Jacuzzi tub?  vertical showers?
These all play in choosing the right Heat Source.
Sincerely,

-- 
Stephen Bohner
Alchemy Construction Inc.
www.alchemyinc.com
707-822-8013



David Seth Melchert 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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