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TRV Mode

I wonder whether anyone else would find this useful:

Problem: old leaky house that is unable to retain heat, potentially with mixed heating modes.

Second problem. How to make best use of a boiler firing when zone is not expecting it.

Solution: introduce 2 new modes for Smart TRVs - Passive and Passive Limited.

The idea would be that (for example on a cold night) the TRV would move to a passive mode. This would set the TRV to full open and in the case that another heating zone called for heat, then this TRV would benefit from the heat too. This is for bedrooms where there are several cold rooms but one that needs to stay at a steady temp (baby room) but the other kids rooms would benefit from the heat too.

In a passive (limited) mode, then the behaviour would be the same except that it would cap the temperature of the room. The trv would stay open until a specific temperature was reached and it would then close. This is essentially the same as a normal TRV.
Again this would be for bedrooms.

These passive behaviours would particularly benefit houses with mixed underfloor and radiator heating where the ufh needs to be on several hours before the radiators, but once the boiler is on, it may as well pump hot water to the radiators too, but the heating wouldn’t be on otherwise.
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  • I'd like this too, but not for the use cases you mention. As the TRVs are pretty noisy when opening/closing, I set my schedule to ensure my bedroom heating never goes on when we're likely to be in bed.

    But this results in a cold bedroom in the morning, and upon waking up I need to manually turn on the bedroom heating.

    With a "passive" mode, I could tell the bedroom to enter a "passive" on state when we go to bed, this would open the TRV, but the room wouldn't heat as all other zones would be off by this time. Then, at 5am when the other zones start calling for heat, as the bedroom valve would be open, it too would start heating and there wouldn't be any noise from the TRV!

  • @Rbbhghs Don't forget to vote for your idea by clicking the grey up arrow.

  • Nice use case also for the solution.
  • We have a similar situation. Old house (UK) with north facing rooms so they cool down faster but we don't need to explicitly have them at a set temperature all the time.

    But because they can cool down a lot they draw warmer air from the surrounding areas.

    I'd probably put them into "passive" mode when they are not being actively used so they benefit from active rooms.

    i'd also like them to follow a target or maximum temperature and close the valve to prevent over heating.

  • Yes please! I'm using two zones of one TRV each and a multi-room main zone from wall stat. All can call for heat, main zone always gets it and TRVs can shut down at temp. It'd be good for TRVs to preemptively open up a bit if temp is falling in their zone and another zone fires the boiler. Otherwise what can happen is main zone calls for heat, hits set point and shuts off then while system is still warm a TRV calls for heat (causing boiler to fire as system temp below boiler set temp) which reheat whole system and causes overshoot in main zone as well as wasting fuel.
  • It took me a while to understand what was being requested but I now see the benefit.

    Since this does not involve any hardware changes a software enhancement like this even if it is somewhat counter intuitive is worthwhile.

    If the TRVs were quiet enough it would be less important. 💤

  • if you contact tado, they can stop the TRV from calling for heat, it will the act as you described 'Passive Limited' mode, you can set a max temp on the TVR via HomeKit or the Tado app, but it will NOT call for heat, But it is like this all the time, I have had my hall TRV like this for well over a year.

    I asked tado to allow users to do this within a schedule and he agreed it would be a great addition, and said they would look into adding it, But this was well over year ago, and still nothing..

  • Tado engineers were not able to made a chilld lock for valves in 4 years...let alone this relative complex feature...sorry, but support were teasing you, as usual.

  • Can Tado please enable an Open option on the radiator valves whereby they remain in the open position and is not controlled by any other device such as the wall smart thermostat?

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