Adding a thermostat to a combi-boiler

[Slime101]

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??

 

[Werewolf]

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).

 

[Slime101]

Its a combi boiler so we dont have a tank as its hot water on demand.

 

[Berserker]

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.

 

[niko]

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)

 

[Al-Ectrician]

You could look into the wireless wall stat's.

Also look at your valves on each rad, are they TRV, or 2 lockshield ?.

Al