hello all, new to this site so here goes With regards to solar thermal hot water, i'm guessing that those of you with negative comments either have little or no knowledge, or are too old to bother learning about new sustainable plumbing products. How many of you have fit a new high efficiency combi boiler (£1600) telling the customer about the 'great hot water flow rate'. Or how they will save £200 a year on thier fuel bill. Thought so. Because your all so clued up I will let you work out the payback on that. The fact is that solar hot water is no dearer on payback terms than any other large investment to your home. What is different is that customer has taken the first step to becoming self reliant, hense not been held to ransome over fuel, as well as preserving the planet that little bit longer.