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Does it matter where I position the bypass valve between the boiler flow and return? I was thinking to connect a honeywell du145 directly after the pump on the flow and then link it to the return from the HW coil - very close to hw cyl If I do this all the extra pipework is in the airing...

Sorry if I wasn't clear. The Hw/cyl, pump, air seperator and 3 port valve are all in the airing cupboard. Boiler is situated on wall in the garage approx 5-6m pipe run away. There is only one vent pipe and one feed/exp pipe on the primary circuit. These are connected as per the previous...

Well, it has an air seperator fitted. Looks to me like a copper Pegler one. The F&E exp feeds in at bottom connection, F&E vent pipe connected to top connection, flow from the boiler is connected to lower side connection and the feed to the pump is connected to the upper side connection. From...

I have an open vented 'y' plan heating system, an indirect cylinder and a Potterton Flamingo (40K btu I think..) CI wall mounted boiler in a small 3 bed semi. Boiler in garage with balance flue through wall. F&E tank and HW cold feed tank in loft. All the rads have trvs fitted except the one...