Hi,

Just had new combi boiler installed, want to replace the old analogue wall
thermostat with a digital one (one that has different heat programmes for
different times of day). Analogue seems so "vague", I reckon there's at
least 4 degrees either side of chosen temperature that it reaches before
it'll click on or off.

Firstly, I've seen some that claim "universal UK backplate fixings ", so
will the new one just screw in to the existing backplate?

Secondly, should wiring the new unit be a case of simply removing wires from
old stat and inserting into new? I suppose best answer would be to check old
unit first and match it up with what new units are available, but are there
many different types of wiring for stats?

Any pitfalls?

Thanks very much for any help.