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In the year that I have had it I get the feeling that my energy usage has gone down (I got a £300 rebate) but could not quantify that. Having a weather compensator fitted to the boiler today, this will enable the system to measure the heat loss of the house vs the external temps and the boiler & evohome will then start to preheat the heating to counteract. This helps as the boiler is ultra efficient at lower burn rates. So I should see a benefit long term in my gas usage.
This is interesting to me, as it sounds similar to my setup currently, I have;
5 x UFH loops
4 x towel rails
7 x rooms with Radiators
Currently I use Nest across 2 zones, then individual controllers for the towel rails (all on one loop) and the UFH loops, which I think is leading to me to spend much more on gas than I need to...