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Been using the Honeywell EvoHome for over a year and think it’s great. Each room is individually controlled so I only heat the ones I use, when I use them. Controlled from and app on my phone or the main hub..
This is paired to a Viessmann Vitodens 200w 35kw system boiler and pressurised cylinder, we have also had a weather compensator fitted (only recently). The evohome / Viessmann is not openTherm compatible, hence why we have the weather compensator. It heats the house from a curve based on homes heat loss / outside temperature and target temp.
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I have Nest, I like it a lot. Excellent at "reach temperature by a point in time" and "learn when I manually change the heating and modify my schedule in future like that". It works when the internet is down (i.e. locally), and has nice thermostat, etc.
Drawback to Nest... it's really "boiler on" and "boiler off"... and that can be crappy if you have a large house and lots of radiators as you're always heating the whole house.
Tado is a radiator TRV that will automatically adjust radiator TRVs and turn the boiler on/off... such that you can control which rooms are heated to what temp and when.
I'd argue Nest is better for US style HVAC systems and smaller UK properties (where you don't care if the whole space is heated so much), and Tado is better for larger UK properties (multi-level 3+ bed homes) where you don't want to heat the whole thing.
But all of these can be changed in future, as they're just a control that adjusts boiler on/off.
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If you're not planning on going in-depth and getting a boiler to pair with it or integrating it with other systems then it pretty much seemed to boil down to whether you want a single thermostat or multiple radiator valves and the cost of them.
They all offer pretty similar functionality otherwise.
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They are all the same Nest, Hive and the wiser system. We fit more wisers as they are UK made by drayton and find the support is a bit better from the installer POV.
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Netatmo is simple. If your not going for the smart house vibe then this is ideal. No hub required and the relay connects to the WiFi. You can get individual trvs which you can control via the app. Compliant with Alexa google and apple
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Cornish_Bike
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@Howard
If people were going to install a new boiler / heating system which thermostat and timing system would they use? Installer has suggested Nest but is there better?