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    Two wire/Three wire thermostats?

    What advantage does the three wire thermostat offer over a two wire thermostat? I've got a Potterton Kingfisher 2 CF125 linked to a Horstmann CentaurPlus C27 with three MZVs off it, two for CH and one for HW. Could I use a three wire thermostat with the above and would it offer any...
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    Drayton RTS1

    Replaced a couple of old Landis & Staefa RAD1.N room thermostats on Sunday evening with Drayton RTS1s. The L&S only had the earth, neutral and live connected, not the, erm, third blue wire. So connected the Drayton RTS1s in the same way (i.e. without the blue wire as don't know whether...
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    Thorn M80

    Just moved into a new house and trying to commission a system with a Grundfoss pump, various honeywell mzv's and a scary old thorn m80/100 ;) Set the thermostat to 0 as per the instructions, put the hot water demand on boost, then turned the gas on then primed and ignited and could see the...
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