Moffat Heating & Plumbing
07817 203589
Posts tagged valve

T.R.V.’s – What Are they And How They Can Save You Money

Thermostatic Radiator Valve

On your radiator you should have something similar to the picture above. These are called T.R.V.’s or Thermostatic Radiator Valves.

T.R.V.’s are self regulating valve fitted to the radiators on a heating system. Traditionally, they have a wax plug which expands and contracts with the temperature around the valve. The plug is connected to a pin,which is connected to a valve. As the temperature around the valve increases, the pin decreases the flow of water through the valve thus allowing a maximum temperature for each radiator to be set.

T.R,V.’s can dramatically decrease the amount of fuel your household burns and thus save you a substantial amount of money as well as providing a comfortable temperature in your individual rooms.

But they must be set correctly to achieve this. Luckily this is an easy process.

  • Step 1 – Make sure your room thermostat is turned up to around 20 degrees
  • Step 2 – Turn every T.R.V. to setting 4 out of 5 (or equivalent) and turn on your heating system
  • Step 3 – Turn down 1 /2 a notch (setting) of the T.R.V.(s) of the room you are in. Give it approximately half an hour and if you are not cold, turn down another 1/2 a notch . Repeat this process until you feel a bit nippy.then turn up 1/2 a notch.
  • Step 4 – Repeat this process in each room. Remember that, you need to take into account what you would typically be doing in each room when setting the T.R.V.’s. i.e. sitting in armchair in your lounge, bathing in the bathroom so try to recreate this when setting the valve.


Note. I said it was an easy process, not quick, you may have to do this over a few days/week. You may also have disagreements with partners, housemates and pets as to what is cold and what is hot. The management take no responsibility for any disputes that arise from following this advice…

My radiator has no bleed valve, what do I do?

Trapped air in your pipes and radiators can cause problems such as unbalanced heating. It’s not always easy to locate the valves to release that trapped air. Not all radiators have a bleed valve on the side of the radiator. Some of the older styles have them on the back of the panel.


Check here first, if this is the case, you may need a special vent key such as the one shown below.



If there is nothing at the back, then you might have the scenario pictured below, where a plumber or engineer has carried out a repair and left a nipple where the vent should be.



If you are ever in doubt then call us for advice!