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doitall, How or why is BigBurner's design any more dangerous than a conventional vented hot water tank. Don't the immersion heaters in unvented cylinders have a safety cut out as well as a stat?

You're referring to this? http://www.wras.co.uk/PDF_Files/Scalding%20information%20note%20Jan%2008.pdf

For my benefit at least, would you please elaborate.

Big Burner, I appreciate your advice, thanks very much. Do you know, am I allowed to DIY this as it is not actually connected to mains water pressure?

I'm not sure what the regulations call for regarding the discharge pipe but it could go through the wall straight to outside. If the vent pipe were to follow the route of the rest of the plumbing there would be some long horizontal sections. There's no obvious alternative route for a vent and...

I'm about to get some upgrading work done to my hot water / central heating system. Currently the gas boiler is on the ground floor and hot water cylinder on the first floor. The central heating circuit is pressurised and unvented, the hot water cylinder is vented. It's a 3 storey Victorian...