I am looking at building a solar water heating system for domestic hot
water. I have 'Googled' and found quite a few good sites for DIY panels,
does anyone in this group have any good links to panel construction and
control systems?

Also has anyone (silly question!) done it and was it worth it.

I can but a system for about 2.5K but I would like to try to do some or all
of it myself.

Thanks.

--
brian