Are you trying to boost the Hotwater?
Or heating ?
Do you have a Heater and water thermostat ?
Or heating ?
Do you have a Heater and water thermostat ?
Well it is do-able as long as there is the neutral available and the space can be created for a relay in the back box plus you'd probably have to do some soldering.I've hit a bit of a dead end, I thought replacing those switches with timer/booster switches would be straightforward and it was just a question of identifying which wire goes where, but it seems like there is more to it than that.
I'm going to have to call in the heating engineer I've used before and get him to look specifically at this.
Thanks everyone for your input, I learned a thing or two even if I didn't get it resolved.
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