[Greenbuilding] Baxi Luna question

[Drew A. Gillett, P.E.]

you are right eric.

again i stress ---stop wasting money on stuff that is unecessary, doesn't 
work and breaks.

oversized solar hot water with electric element in top of tank is way to go 
,  no muss no fuss.

i do agree with dr vasile that the gfx is a nice preheater for the solar 
tank and can be cost effective if easy to install., but

tankless (gas or electric )are an unecessary, expensive and difficult ( does 
not work well) when you have a solar system.

 putting the tank in a heated space ( so losses are useful) insulating 
pipes, reducing runs to point of use and perhaps a thermosyphon return line 
( no electriciuty, pumps or valves, and maintains solar stratification) are 
the way to go.
----- Original Message ----- 
From: "Eric Cadora" <handygoy at bigla.com>
To: "Greenbuilder list" <greenbuilding at listserv.repp.org>
Sent: Wednesday, June 20, 2007 12:56 PM
Subject: Re: [Greenbuilding] Baxi Luna question


> 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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