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The circulating pump wont stop water passing through it when its off and it wont cause any harm if it feeds the taps etc from both supplies.

Your right unless its piped and wired in a certain way, ie return connection taken off before the shower pump and secondary pump wired to shut off when the shower pump switches on then it would not work. If the pipes and cylinder are insulated properly as in loads of armaflex then it would be a...

The guy asked for a pump to increase the flow of water for his extension in both the hot and cold supplies. the only way of incorporating a secondary return into this is to change to a pressurized cylinder and have the whole thing at a uniform pressure, then you can pop on a bronze pump to keep...

Not what i mean. Once the water from the cylinder is piped through the pump then everything after that point is pressurized. The secondary return connection would have to be after the last outlet in the extension to work properly and being after the pump would be at pump pressure thereby...

Im just wondering how to make a secondary return work what with having a 3 bar pump after the cylinder. Wouldn't it pressurize the water in the return pipe and keep overflowing itself into the tank? And as its a flow switch the pump would run constantly.

Firstly the pump is operated by a flow switch, so that when you shut the tap and the water stops flowing the pump stops pumping. The pipes need to be well insulated.

Generally the bath would be fitted before the wall is tiles so that the wall can be built out (with plasterboard maybe) to square it with the bath then after tiling it is hidden.

One twin impeller pump would be fine. Best to have a dedicated cold supply from the tank and a dedicated hot supply from the cylinder# One of these would be ideal as they are very reliable and the customer service is outstanding http://www.stuart-turner.co.uk/products/monsoon/u30-bar-twin...

Its worth checking if the brackets are on the long or short sides. Rad brackets are L shaped pieces of folded steel one part being twice as long as the other so it could be that they are on the short side already so it would just involve turning then and maybe adding a little bit of plywood...