[Greenbuilding] Baxi Luna question

[Eric Cadora]

My understanding has been that if you have a solar hot water storage  
tank that's backed up by a tankless water heater, than it's pretty  
much impossible to add on a recirc pump.
Please tell me I'm wrong.

Eric Cadora


On Jun 20, 2007, at 9:36 AM, George J. Nesbitt wrote:

> Even better might be to use a tankless electric (SESCO) as a backup  
> to the solar water heater. Invest in a larger storage tank vs.  
> panels, a tank with a internal heat exchanger for the solar loop.  
> Invest in water efficient fixtures, distribution system (structured  
> plumbing), and a D'Mand recirculation pump.
>
> Drew A. Gillett, P.E. wrote:
>> don't waste your money on a tankless
>>
>> instead , save a lot of capital, some operating costs,  a lot of  
>> maintenance costs,  and a hassle with poorly operating tankless  
>> units and simply install a backup electric heating element in the  
>> top of the solar tank and an extra collector with the money you  
>> save on not buying the useless tankless.
>>
>> ----- Original Message ----- From: "Jefro" <jefro at jefro.net>
>> To: "Greenbuilder list" <greenbuilding at listserv.repp.org>
>> Sent: Tuesday, June 12, 2007 8:57 PM
>> Subject: Re: [Greenbuilding] [BULK] Re: Baxi Luna question
>>
>>
>>
>>> You guys have me worried now.
>>>
>>> I'm building a new house & plan to install a Baxi Luna, Takagi,
>>> Bosch/Aquastar, or similar propane tankless heater, which will
>>> eventually back up a solar preheat tank (when I can afford the  
>>> solar).
>>> Kitchen sink is 10 feet from the heater, tub and shower are  
>>> upstairs,
>>> total run to get there is about 40 feet.  I'm wondering now if a  
>>> better
>>> option is to install a direct-vent gas tank and double-wrap it in
>>> insulation.
>>>
>>>
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>>
>>
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>>
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