Two flat plate collectors (about 96 sq. Dual priority Novan controller for use with spa and domestic hot waterThis may be a weird first post, but here goes: I am trying to find a small expansion tank for the solar heating system in my shop. An immersion heater/unvented hot water cylinder might be needed as a back-up heater or to get the water to the temperature you want.Blast solar energy has been servicing old solar thermal and hot air systems for. This is then used to heat your water, which is stored in a hot water cylinder. Solar thermal panels use heat from the sun to warm fluid passing through them, as the diagram below shows.

They can be used in any climate, and the fuel they use - sunshine - is free. Glycol mixs won't work- the plates get too hot when they stagnate, and an acid compound forms.Solar water heaters - sometimes called solar domestic hot water systems - can be a cost-effective way to generate hot water for your home. The Brayco oil has lots of great properties, like good thermal transfer, high boiling point, non-toxic, non corrosive, but doesn't like butyl rubber. Back in the day, Amtrol made special tanks with Hydrin bladders, but no more. My problem is this- every tank I can find, like Amtrol, etc., uses butyl rubber bladders, and the Brayco oil will attack butyl. The oil is from the early 80's, a product called Brayco 888 that was made for solar systems.

FWIW, they are Novan products, and Novan was based in Boulder, if I remember right. Where a lot of these systems were sold, back in the day. I have heard that the Bray oil can be sold for upwards of $100/gal.

Novan Solar Hot Water Panels