Home DIY

Just googled this - http://www.heatweb.com/products/cylinders/heatbank/worktop.html

I've had a quick search but am struggling to find any more detail of how exactly it works but could be worth a trawl.

Actually, scrub that idea, it needs a boiler too. I reckon a combi will be your best bet overall, especially if you can get one installed at a realistic price. It is a recognised system and eventual buyers are likely to be put off by anything differing from the norm.