[RE-wrenches] Solar thermal covering

[Bradley Bassett]

When I found that my system was somewhat oversized, I plumbed in a mixing
valve and a heat dump radiator (a few Cu pipes) in the crawl space to dump
the heat. It's on the solar supply line and it works like a charm. It
actually adds a very modest amount of heat to the crawl space, not enough
to notice. It's going on 20 years without any issues, probably because it's
an anti-freeze system so no mineral buildup in the mixing valve. I've also
heard of using a fin radiator under the eve for this instead of the crawl
space. The crawl space was easier for me.

Brad Bassett

On Sun, Jun 15, 2025 at 5:02 PM david quattro via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> There must be a variable mixing valve that is informed and controlled by a
> thermocouple
>
>
>
> On Sun, Jun 15, 2025 at 4:46 PM Jay via RE-wrenches <
> re-wrenches at lists.re-wrenches.org> wrote:
>
>> Hi all
>>
>> I’ve inherited an incorrectly sized solar thermal evacuated tube system.
>> It’s too many tubes for the use most of the year.
>>
>> Does anyone know of a design or product that can remotely cover them?
>> I can find shade cloth of course that I can cover them but something
>> remote control would be better
>>
>> Thx
>> Jay
>>
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