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thanks for the reply/info shouldnt it be called anti-gravity then, as the hot water goes up :) sorry-- I havent been doing a good job of describing this. yes it does have a cylinder thermostat. tomorrow, I'll do a digram of whats there, and see if that helps solve it but...

thanks for the reply Im not exactly sure what I have! :? there are 2 water tanks, one small, one large, for each flat. one gravity feeding the hot water, as expected , the flat with the "one" wire cut, ch doesnt work on the "16" setting, unless you move both hw and ch manually...

the valves in both flats are honeywell v4073a1039 sundial Y plan diverter valves. However the new siemens programmer [installed by a plumber] was set on 16, not 10, which explains some of the confusion/issues. [this is in the flat that had the 1 wire removed] I've installed the other new...

thanks all for the replies I'll be taking a look at this again tomorrow, and will report back with more info thanks

Greetings help much appreciated edited-- sorry for new long post I bought a new [white] siemens rwb2e to replace an existing landis gyr rwb2 we have a pumped /gravity[?] fed ch/hw system, gas boiler, room stat, cylinder thermostat. the system also has an immersion heater in the...

well in case anyone else searches here for a thermostat for the radiant rsf24 rsf 24 the honeywell dt200 works well. connections for a unit with an existing internal anolog clock are move yellow out from Clock, from TA/Term 2 to OR / term 3, on PCB add wire from OR/ term 3 on PCB...

thanks for the reply the thermostat location is very close to the boiler so wont need wireless. on reading, Honeywell seems to be the preferred make here, so will something like this do...

Greetings :) I have done a search here for info, but could not find much on this boiler. However thanks to useful tips here, I now have the full installation manual. The boiler has an inbuilt 24hr timer [old school analog with the push/pull tabs] I would like to add a room thermostat...