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Just to say thank you for all who posted, I finally fitted the system and tested and for the record there was no reverse flowit worked really well. Once again thx Paul

If you read my earlier description you will see I do not have it piped in as you described, the only place the two circuits meet is at the t as shown in the drawing.

The return from the cyl drops from the the first floor into the t at the return inlet into the boiler which is situated on the wall, the return from the first floor radiators drop to the ground floor and joins the down stairs radiator returns and that return raises from the ground floor into the...

I have to move the boiler and due to the regs have to change it for a condensing boiler (worcester 18 gas) this is wall mounted and to reduce the amount of pipes running up and down the wall I wanted to join the two returns as they enter the boiler.

I have attached a image of the new system, is this acceptable or is there a danger of reverse return? Thx Paul

central heating

On the return circuit is it ok to connect the return from the hot water tank and the return from the radiators with a t-connector just before it is connected to the return connection on the boiler? Thx in advance Paul