[RE-wrenches] tankless hot water and pumping question

[Matt Tritt]

Ian,

I have a Bosch Aquastar hydro-ignition unit, but no solar feed. I 
originally had a Myson tankless heater (you probably remember them) that 
I bought with the misunderstanding that it would modulate according to 
input temp, but the standing pilot was kind of a drag, even if the unit 
might actually modulate. This is a subject that has been on my mind for 
years, since I would really like to be able to use both my whopper solar 
panels AND my (most excellent) tankless heater in the same system 
somehow. I had designed a parallel bypass system that would allow both 
sources, but the big problem with the tankless heater - without a 
standing pilot - is that it might have the opportunity to freeze if not 
used for a significant period of time.

Matt T

Ian Woofenden wrote:

>
> Hi Todd and all,
>
> Since this is a renewable energy list, I think it's worth mentioning 
> that installing a modulating demand heater will make the installation 
> "solar ready".
>
> I'm only aware of one tankless heater that accepts pre-heated water 
> and has no electrical usage, and that's the Bosch 1600PS (which I live 
> with). I'd love to know if there are others, since this is a common 
> need in off-grid systems. Some of the other modulating heaters on the 
> market have significant electrical demand, which is a deal breaker for 
> us poor off-gridders.
>
> Ideally, we'd have such a unit that doesn't have a standing pilot, but 
> I've never heard of such a product, though there are non-modulating 
> heaters that run on piezo igniton and a couple of D-cells. Bosch's 
> hydro unit is a neat concept, but it's not modulating.
>
> I hope others will share their knowledge and experience.
>
> Ian
>
>
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>
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>  
>
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