[Greenbuilding] Baxi Luna Question

[George J. Nesbitt]

Steve,
you are right that the baxi has a built in expansion tank (I didn't 
catch that in the info I have), so an external would be redundant, the 
Quietside also has one built in. The advantage to the 
Baxi/Quietside/etc.. is easy installation, plug and play, simple, less 
expensive, more reliable, etc..
The Baxi can produce 3.5gpm at a 60deg F temp rise, enough for a shower 
at 2.5gpm, but not much more. So for small houses with few people, and 
hot water draws that don't happen at the same time its ok. For larger 
houses with more people and larger draws a storage tank will greatly 
increase the availability of hot water. Although endless hot water 
doesn't encourage conservation.


steve at slorevo.com wrote:

>Thomas:
>
>We have a Baxi Luna providing DHW and radiant heating for (currently)
>450 SF, to be expanded to 900 SF later this year. We don't have a
>holding tank or expansion tank. It works great. Although I'm not a
>plumber, as far as I know, the Baxi Luna has an expansion tank
>internally. 
>
>I would agree with George that your plumber underbid the job--the retail
>price on just the Baxi is $3000+ USD, wholesale would be about $2000 I
>suspect. Seems to me you need to find a new plumber.
>
>Regards,
>Steve Mann
>
>  
>
>>-------- Original Message --------
>>Subject: Re: [Greenbuilding] Baxi Luna Question
>>From: "George J. Nesbitt" <geoedb at idiom.com>
>>Date: Mon, July 10, 2006 9:09 pm
>>To: greenbuilding at listserv.repp.org
>>
>>Yes your HVAC contractor is partly right. But it doesn't cost $4000 to 
>>add an *expansion* (buffer) tank (needs to be installed anyway) and a 
>>*buffer* (holding) tank (a small electric water heater tank probably 
>>less than 10 gallons in size). The plumber underbid the job and is 
>>trying to make up for their lack of experience.
>>
>>George J. Nesbitt
>>
>>#####
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>>Eggert, Thomas L wrote:
>>
>>We were to put a Baxi Luna combined boiler into a new house that we
>>are building.  It was to supply both the domestic hot water and a
>>multi-floor radiant system.
>>
>>The plumber that our builder found had no experience with the Baxi
>>Luna system and gave us a bid for about $3000.  He now wants an additional
>>$4000 because he is telling us that the system has too much capacity
>>for our uses and that he would need to install both a buffer tank and a
>>holding tank.  It would seem that he wants to convert a tankless
>>system to a tanked system.  It does not make any sense.
>>    
>>
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>>Tom Eggert
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