Adding a room thermostat?

Your system is operating exactly within design specs, as was my identical one, less than a year old.

I felt as you do and bought an RF thermostat/programmer. I estimate savings have been about 40% of the bill by having the extra control, as mine is on virtually 18 hours a day.

It seems that the RF control was overkill as it has ended up in the hall in the same place that I would have put a £10 wired one.

Actually, it's been illegal to install a system which works this way since April 2002, and also any boiler change since that date in such a system requires that the system be brought up to current standards. Boilers installed since April 2002 must include a boiler interlock which shuts off the burners when there is no call for heat (i.e. all rooms up to temperature). This is most commonly done by using a roomstat in one of the rooms (ideally the longest to heat up), and don't use TRV's in that room (or set them to max or take the heads off if they're already there).

The associated energy saving is why such schemes were outlawed in the 2002 Building Regulations.

Sorry to be ignorant but what is RF?

Keith

Radio Frequency.

In this case, the thermostat uses a radio frequency to send control signals, rather than using a wired connection. Hence, you can move the thermostat around the house without worrying about dragging a long length of cable around :-)

How much did that cost please? Is it something I would need an electrician to install (I wouldn't want to do anything risky myself!)

Many thanks.