Adding a thermostat to a combi-boiler

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We have a combi boiler which is fine, except the heating system doesnt have any form of thermostat, just a timer - so its on, or off. I currently get round this by getting it to turn on for say 30 mins, then off for 30 throughout the evening when we want it on, but its a pain, not very accurate and generally you are too hot or too cold.

Does anyone know how tricky it is to install a thermostat into the system so we can control the room temp (say in the sitting room). I presume its a quite simple interrupt of the wiring between the timer system and the boiler??
 
Commissario
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To do it you're probably going to need to change the controller + possibly add a tank stat and electrical valve if you've got gas heating and water.

The good news it's not that hard to do, or expensive (when I did ours a few years back it cost about £100 all in for a Danfoss controller kit with the valve/stats/controller + cabling).
 
Man of Honour
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Werewolf was correct on the first point though - the best way to do this would probably be to change the controller. This is easier with some boilers than others. If you've got/can get the service instructions for the boiler they'll tell you how.

I've got a combination wireless timer/thermostat system wired up to my Worcester combi. Works very well and I can put the thermostat wherever I want it.
 
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you just need a room stat ,you can get these very cheaply
there not hard to wire in and no plumbing involved
although i would recommend rad thermostatic valves as well (dont buy cheap ones of these thou as they dont last long if you do)
 
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