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Hi, I've just updated my central heating controls from an ancient Danfoss 103 Mechanical Timer to the following Honeywell parts: 4073a mid-position motorised valve cm921 wireless thermostat st9100a programmer (for hot water) l641a cylinder thermostat Sundial Plan Wiring Centre...

Hi, I have a fully pumped central heating system which is currently, very basically, controlled by a Danfoss 103 timer and a manual 3 port valve (currently 'stuck' in the mid-position) there is no room thermostat or cylinder thermostat. This setup is not very cost effective so I'd like to...