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Thanks for your replies, however need some clarification: do we need to get rid of all the Vaillant controls and replace with 2 x Honeywell CM927 or what about Siemens REV23's mentioned on other posts? Do the thermostats need to be wired direct to boiler somewhere? (Ebus?) and how do they...

Help please? :cry: We have installed a Vaillant 937 in 4 bed detached 1930's house we are rennovating with 1 bathroom & 1 en-suite, seperate pipe work installed for upstairs and downstairs heating zones. We want to be able to control the heating for up and down independantly, and have...