Thank you for detailed idea. This is how the system used to be, I did not really like it though. To get a good temperature in the living room room, the hallway was constantly on and wasted energy for nothing because we were never there. Instead, the thermostat is in the living room now, and the room temperature is always great there. The temperature in the other rooms are either intentionally lower, or just track the living room.One radiator in the system should not have a TRV fitted. It's usually the one in the hallway which is the coldest part of your house. It's also the place you fit your programmer stat. The stat controls the heat demand by reading the room temp. If you had a TRV fitted they would constantly fight each other.
For example, if your radiator shuts off at 20 degrees and your stat is calling for heat to 21 degrees, your heating will run constantly because you will never reach 21 degrees as your radiator will not excees 20 degrees.
Thank you. What I am not sure is what kind of TRV I need. There are many types, and I have no clue which would fit to my valve, and whether I do it at all without changing the existing valve.What valve is on the other side of the rad? You' want a Thermostatic Radiator Valve (TRV) as in your pic
What valve is on the other side of the rad?
Thanks a lot, Madrab. You are correct, it was a fix stat in the hallway where this radiator is. This is exactly the type that my other radiators have. So, there is no option to replace it without closing the pipe system, and later refill it, right?Ah, OK, whoever fitted that rad either had some spare danfoss lockshields or it may be there as a bypass. You say the thermostat was in that room/space? Was it fixed to the wall? That'll probably be why there are 2 non adjustable valves on that rad.
If you want a TRV on that rad then you need to change out the whole valve. This is the valve (Danfoss RAS-C2) that matches those lockshields
View attachment 320577
Yes, you would need to depressurise the CH along with that rad and then replace the valve. You are in luck though as it's a top entry, you wouldn't need to drain either the rad or the system, just depressurise. You can re-use use the bottom nut and 10mm push fit reducer as they would fit the new valve if it's the one in the pic I sentno option to replace it without closing the pipe system
Not quite correct, a TRV has a range, depending on the head a mechanical head around 6ºC and an electronic head around 2ºC the wall thermostat also has a range between on and off, between 0.5ºC and 1ºC, so if radiator starts to close at 19ºC and the wall thermostat set to 20ºC then on a cold day the wall thermostat will never turn off and the radiator will vary in temperature to maintain the room temperature, and the boiler will modulate to match, keeping the rooms spot on temperature without any hysteresis, but on warmer days the room will get slightly warmer so then the wall thermostat will turn boiler off.One radiator in the system should not have a TRV fitted. It's usually the one in the hallway which is the coldest part of your house. It's also the place you fit your programmer stat. The stat controls the heat demand by reading the room temp. If you had a TRV fitted they would constantly fight each other.
For example, if your radiator shuts off at 20 degrees and your stat is calling for heat to 21 degrees, your heating will run constantly because you will never reach 21 degrees as your radiator will not excees 20 degrees.
If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Are you a trade or supplier? You can create your listing free at DIYnot Local