Is it ‘safe’ to have TRV on all radiators?


The room where our original Tado Smart Thermostat is is the only radiator in our gas-powered heating system currently without a TRV. 

We know Tado give their blessing to having a Smart Radiator Thermostats in the room where the Smart Thermostat is located - for the reason we want to have it - it just gets too hot in that room when other rads in other parts of the house are getting up to their temperature.

The thing that’s playing on my mind - traditional central heating plumbers all say that heating system must have one room that doesn’t have a TRV.

Of course, we’re not in that world any more - but, before I pay the plumber to come in and take out the straight pipe and put in a TRV,  I’m looking for assurance /confirmation that it’s ‘safe’ to have TRV on all radiators.

What are the reasons that traditional central heating systems insist on one room that doesn’t have a TRV? Does that make any sense in a Tado world?


  • TtT

    In theory at least, tado will stop the boiler when all TRVs are off (aka temperature reached) so that should negate the need for a bypass or rad without a TRV allowing hot water to flow still. But I'm not a heating engineer, so don't quote me on that!

    Towel rails are often used as an effective bypass and are not really suitable for tado rad stats - that the case for my setup.

  • Many thanks for the replies.

    I went off and did a bit of research and found this guy, who seems to know his beans, explaining what an automatic bypass valve is, what benefit it brings and where to fit it

    It sounds like it's something that should be fitted to most system anyway.

  • I've just come back to this a year later and I'm pretty sure that 'the official' answer that had been given - "Fit a Automatic bypass valve" - has now been deleted. Odd.