[dharma1]

I recently built a flat roof 35m2 home office/gym at the back of my garden. I'm currently using an electrical convection heater and a 9kw instant water heater for shower/basin.

What would be the most cost effective way to use solar instead for heating/shower? I was thinking about putting a 100-200 litre insulated tank either inside or outside, and heat that with solar to about 70c, to use for both heating in the winter, and showers. I don't need cooling in the summer.

Has anyone done this?