- Joined
- 27 Jan 2008
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- 24,925
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- Location
- Llanfair Caereinion, Nr Welshpool
- Country
The ST9400C is a simple timed relay, there are many relays which can be controlled over the internet, I use one for my lights, I use Nest Gen 3 which is useless, as it does not connect to TRV's. But that is the thermostat not the programmer bit which is useless.
Wiser claim their TRV's have algorithms that work out when they need to switch on to get room to temperature at time programmed, however you like me say you already have internet connected TRV heads, I have two types, 5 x eQ-3 and 4 x Energenie Mihome neither connect to the thermostat/programmer although the Energenie Mihome claimed they would connect to Nest which is one reason I bought Nest, however the app would change them both, but not the wall thermostat, and they worked wrong way around, the TRV should tell the thermostat/hub but Nest has the wall thermostat telling the TRV's what to do, which is useless.
However since you already have the TRV heads, like me you want the wall thermostat if possible to work with them. Interested your using Smartlife, and zigbee, as I also have that, but not for central heating. I did look at Hive, but it has a 22ºC limit, once the wall thermostat hits 22ºC it will not accept any demands for heat, so the wall thermostat needs mounting in a cool place.
Late Mothers house I used the Energenie Mihome TRV's and found I could set the wall thermostat so boiler would auto shut down on warm days, but on cool days the TRV heads did all the work and the Bosch boiler modulated as designed using the return water temperature, the hall where wall thermostat was mounted cooled faster than any other room, so it worked well.
However trying to emulate that in this house did not work, two reason, one hall cools too slowly, and two the boiler does not modulate. And I now realise how much is down to house design, my last house was open plan, heating was easy, one central thermostat, but it was expensive to heat, however living room had a fan assisted radiator 3.5 kW conventional 4 kW and gas fire 4.5 kW so no need for geofencing, it heated up that fast, this house also geofencing does not really work, it turns down the heating when I leave, but I need to remember to turn it up again before I start for home, as the house heats too slowly for the geofencing to reheat it in time for my return.
As to google Nest mini control, I simple don't trust them. Very good playing music, and turning on lights where I can see immediately if it has worked, and also told me how to spell immediately. However with central heating if it gets it wrong, by time you find out it's too late. I had it with high winds last year, EE mast went down, and central heating went into Eco mode as I thought I was not home, but each time I walked past the wall thermostat it returned to comfort mode for a time, so it was nearly 24 hours before I realised what was going on, and house was darn cold.
This house the radiators are big enough to maintain the temperature, but to increase by even just 3ºC takes an age, not the boiler at fault, I can hear that cycling, the radiators are not big enough, I had all big ideas of staggered heating, start at kitchen, the dinning room, then living room etc, so it would reheat faster, and only when required, but the radiators are not big enough. One needs radiators at least 3 times the size of the boiler to use smart heating to heat the home as required.
My problem is once the boiler starts to cycle, the slewing it too high, so water is quite cool before it switches on again.
Wiser claim their TRV's have algorithms that work out when they need to switch on to get room to temperature at time programmed, however you like me say you already have internet connected TRV heads, I have two types, 5 x eQ-3 and 4 x Energenie Mihome neither connect to the thermostat/programmer although the Energenie Mihome claimed they would connect to Nest which is one reason I bought Nest, however the app would change them both, but not the wall thermostat, and they worked wrong way around, the TRV should tell the thermostat/hub but Nest has the wall thermostat telling the TRV's what to do, which is useless.
However since you already have the TRV heads, like me you want the wall thermostat if possible to work with them. Interested your using Smartlife, and zigbee, as I also have that, but not for central heating. I did look at Hive, but it has a 22ºC limit, once the wall thermostat hits 22ºC it will not accept any demands for heat, so the wall thermostat needs mounting in a cool place.
Late Mothers house I used the Energenie Mihome TRV's and found I could set the wall thermostat so boiler would auto shut down on warm days, but on cool days the TRV heads did all the work and the Bosch boiler modulated as designed using the return water temperature, the hall where wall thermostat was mounted cooled faster than any other room, so it worked well.
However trying to emulate that in this house did not work, two reason, one hall cools too slowly, and two the boiler does not modulate. And I now realise how much is down to house design, my last house was open plan, heating was easy, one central thermostat, but it was expensive to heat, however living room had a fan assisted radiator 3.5 kW conventional 4 kW and gas fire 4.5 kW so no need for geofencing, it heated up that fast, this house also geofencing does not really work, it turns down the heating when I leave, but I need to remember to turn it up again before I start for home, as the house heats too slowly for the geofencing to reheat it in time for my return.
As to google Nest mini control, I simple don't trust them. Very good playing music, and turning on lights where I can see immediately if it has worked, and also told me how to spell immediately. However with central heating if it gets it wrong, by time you find out it's too late. I had it with high winds last year, EE mast went down, and central heating went into Eco mode as I thought I was not home, but each time I walked past the wall thermostat it returned to comfort mode for a time, so it was nearly 24 hours before I realised what was going on, and house was darn cold.
This house the radiators are big enough to maintain the temperature, but to increase by even just 3ºC takes an age, not the boiler at fault, I can hear that cycling, the radiators are not big enough, I had all big ideas of staggered heating, start at kitchen, the dinning room, then living room etc, so it would reheat faster, and only when required, but the radiators are not big enough. One needs radiators at least 3 times the size of the boiler to use smart heating to heat the home as required.
My problem is once the boiler starts to cycle, the slewing it too high, so water is quite cool before it switches on again.
