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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