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Thanks for the reply. With the setup I have, I don't think that's possible without spending a lot of money. There is no easy way to get connections back to the pump or 3WMPV from the cylinder. So, essentially, I am stuck with the setup I have. The main problem being how to deal with the feed...

I should add, what I currently have is more like the S-PLAN on that linked page. i.e. If boiler is on HW is always on. If CH on timer is on, valve is actuated and water is allowed into the radiator circuit. Basically, I want to use a cylinder thermostat to block the feed into the...

Thanks a lot for the reply. The problem I am trying to solve is the water in the cylinder getting too hot (I am fitting a pumped shower which has a thermal limit to avoid cavitation). The cylinder is in the airing cupboard and has no connections back to the pump, wall control unit or...

Hi there! (1st post), I currently have an indirect cylinder which looks like it has been bodged in. It is currently plumbed as follows: There is some sort of very old physical thermostat plugged into the bottom of the primary coil. The feed goes into this thermostat. The return...