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Worcester Bosch Greenstar 25i ErP boiler

thebiglebowski
thebiglebowski ✭
edited January 21 in General Questions & Topics

Moved into new house about 6 months ago and it has a Bosch 25i combi boiler and had a Hive thermostat fitted. The Hive was just the thermostat with wireless receiver but no hub.

I've bought a V3+ wireless starter kit as I read the Bosch doesn't support opentherm for the modulation. Then followed the instructions for replacing the Hive as per the app.

N > N

L > L

L > CH Com (link connection)

CH NO > CH NO

The heating is being triggered ok but I'm finding that it is either dropping well below the target temp before switching on and then overshooting the temp before switching off.

Does the thermostat learn how long it takes to heat or is this just a quirk of Tado? (the Hive was good at keeping a uniform temp though)

Is there any benefit to using opentherm or the boiler modulation and if so is it possible to set this up with the V3+ wireless kit?

Comments

  • dchao
    dchao ✭
    edited January 21

    I have the same boiler, the promlem is not the boiler, but with Tado cloud servers, when the weather is cold, like the last few days, the servers have to process more requests, so the instructions to turn on or off the boiler will get severely delayed, depending on the server load. When the weather is not that cold, the scheduling speed is back to normal.

    What I don’t understand is why Tado will not adding capacity to their servers, since they are adding a lot of new X users on to the system. This problem has been going on for months.

  • thebiglebowski
    thebiglebowski ✭

    Ah that's disappointing, seems strange that they wouldn't manage the temp control locally and just use the cloud servers for the analytics stuff. Problem I have is that the house loses heat so quickly that within 1hr it drops 3c if it's cold out.

    It seems to be feathering as well, it turns the heating on for 10mins and then off for a while and then back on again for 10mins so never holds the target temp.

    Think it's going back for a refund tomorrow :(

  • dchao
    dchao ✭

    That's because you didn't install any wireless temperature sensor upstairs. This is not a fault of Tado, but common to all TRV's. Because the temperature sensor is inside the valve and located far too close to the radiator itself, that's why you see a lot of false triggerring (feather). By installing a seperate temperature sensor away from the radiator and windows, your room temperature can be more accurately controlled.

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