Drayton Wiser Smart Heating Radiator Thermostat Works with Amazon Alexa, Google Home, IFTTT
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Every since I encountered my first central heating system (in the mid 1980's), I've been deeply disappointed by the crudity of the controls. But if you’re worried about paying for premium automated services, the longevity of the company who supplied your system, or even want to do away with the cloud altogether, you could embrace the open source Home Assistant software. Not sure if your boiler is OpenTherm, but only the single channal Wiser can work with the OpenTherm module as far as I understand.
Out of interest, for others in the home that want to control the system on their phone, do you give them your login details and they log in to the app that way, or should they register as being 'not the home owner'? The behaviour is as you describe - calibration runs for a good few seconds as the motor winds down to find the closed position. It just means you can control the radiators in every room of your home individually through an app on your phone, anytime and anywhere.
With a smart heating system you move across to a permanently "on" situation but use the stats to vary the temperature across the day such as 21c daytime and 16c overnight or whatever your preferences are. With the heating off you can’t change the temperature on the hub, but once you’ve switched the heating on, you have room by room control on the hub, as you do if you turn the heating on by voice control . if its an evening time, the living room wants to be 21C, the bedrooms can be left off as with the kitchen and bathroom (kitchen normally warmed by oven being on). Great quality smart radiator controls from Drayton who I trust for heating controls having years of central heating experience. However, when the battery switches off, the app will notify you a smart thermostat has gone off line which is how you know when to recharge them, and the app prompts you to replace old batteries when they still have useful life left in them - which I know because I’ve reused the pairdeer batteries for things like games consoles, so my approach with the rechargeables seems less wasteful.
And Tado, Type 17 has Netatmo along with the Netatmo weather station outside - which is more accurate than relying on regional weather info. Now, I can achieve a more dynamic balanced system, and when all rooms have met their targets the boiler heating flow shuts off. It will have some effect, but modelling it seems quite involved, because it's dynamic - until the 'unheated' room falls to its Setpoint and starts being heated as well. but now I am thinking- if tell the bedroom to heat up 9-11pm, and the living room 5-10pm etc- will this just mean the boiler is on from 5-11pm? We work from home so mostly we will keep 1 zone to temp all day, while bedrooms only trigger before night time.Each of my rooms that has a wiser TRV is a “zone’ , in one of the rooms the rad is buried under a desk so I’ve put the thermostat in that room and “added” it to that specific zone - Wiser now uses the thermostat to control the TRV. I had one smart radiator valve go offline which is in one of the furthest rooms from the hub, very early on in the install. If I do choose not to put a smart thermostat on all the radiators, would it be worth having a standard TRV on those ones or best with nothing? Of all the smart radiator valves we looked at, this one was the most pleasing to the eye, so if you care about design details, that might sway you.