[Greenbuilding] Radiant heat boiler

[Keith Winston]

I've installed a very similar product from Triangle Tube, the Prestige. 
It's pretty nice, I've got one in my house and one at a clients. I don't 
know if you can call it a true combo unit, in that it doesn't have 2 
heat exchangers, so you need a heat exchanger (in the form of an 
indirect tank, generally). Good fit for solar (which is why I have it) 
and efficient (mid-90's) and reasonable (somewhat over $2k for the unit 
itself, much more installed of course).

Keith


William Updike wrote:
> 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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-- 
Keith Winston
Earth Sun Energy Systems
Hyattsville, MD 20781
301-980-6325
send me mail at 
keith at the company below
www.EarthSunEnergy.com