Solution for smart thermostat radiator valve (TRV) inaccurate temperature measurement.
Hi, I like many other people have struggled with the completely inaccurate temperature measurement of the smart TRVs, this causes the radiators to shut off before the room has warmed up, the Tado solution to use the offset feature doesn’t work for me, or I suspect anyone.
I have managed to get my smart TRVs to work as they should by using an Oventrop 1011450 adapter that rotates the smart TRVs by 90degs so they are horizontal, this adapter can be fitted to the existing valve without the need to do any plumbing like drain down the system. Rooms I have added the Oventrop adapter to now work perfectly, just as well as using a separate temperature sensor. I have attached a picture of the Oventrop adapter and one of my radiators with the adapter fitted.
The Oventrop adapters cost around £8-9 each (including delivery) if you order 4. The Oventrop adapters don’t appear to be available from UK plumbing merchants (none I tried anyway), but you can get them from ebay and amazon retailers who all appear to be in Germany. Therefore the delivery charges can be quite high, hence it’s best to order several at once to keep the cost down. I used an ebay seller called “ml-haustechnik” (I have no connection with them) who was the cheapest at the time and delivery about 4 days from Germany to UK (eBay item number: 331468588631), but there are other sellers you can choose from. Prices on amazon are higher, although many of the retailers seem the same.
The Oventrop 1011450 has a M30 x 1.5mm fitting at both ends, this is the same as the Tado TRVs so you won’t need to use any of the Tado adapters if the Tado TRVs fit on to your radiators. If you currently use an adapter, then you will still need to use the same adapter to fit the Oventrop adapter to the radiator, the Tado TRV will fit directly on to the Oventrop adapter. Oventrop do make another version of this adapter with different fitting, I think it is part number is 1011460, so just be careful you are ordering the right one.
I have not been able to find anyone else who makes anything similar in the M30 x 1.5mm fitting (Dandoss make some similar for their TRV connection type), so if anyone can find a cheaper alternative, please post-it.
I have vertical Tado TRVs fitted to all my radiators including the ones I have fitted the Oventrop adaptors to. The vertical TRVs work normally when positioned horizontally, the only difference is the display is read from the radiator end in the vertical TRVs which is slightly less convenient in the horizontal configuration.
I think the Oventrop adapters work because the Tado TRV temperature sensor is both further away from the radiator, and is facing away from it. Therefore, the “radiated” heat from the radiator doesn’t cause the Tado TRV to heat up and trick the sensor into thinking the room is hotter than it is. The Tado TRV can now measure the room air temperature through “conduction” heat transfer which is what it should be doing.
It is disappointing that Tado still haven’t recognised this problem or created a solution that actually works, but if you still want to persist with the Tado offering, then this approach worked for me and is cheaper than purchasing separate Tado sensors for each room.