Designing & building a solar hot water tank

[TimJFowler]

Permaflex looks like a promising tank liner. I'm also interested in hearing about some 'real-world' experience with it.

Originally Posted by Daox

Moving forward, I have to get measurements of the exact envelope that I'm working in. I'll be designing another frame around the tank to hold the cellulose. It will be a very low cost design being framed in 2x4s or 2x2s and covered in construction plastic as much as possible. I'll then blow cellulose into this framing and that will give me my inexpensive insulation.

Why not go with XPS or other non-hygroscopic foam for the insulation? You wouldn't need to build a 2nd frame to hold the insulation and you avoid possible issues with water condensation in the cellulose.

Also, how will you be insulating the top and bottom of the tank?

Thanks for the write-up. I like seeing someone else's thought processes on a project like this.

Tim