Solve common heating problems

Patchy heat on radiators

It is quite normal for the top of the radiator to be hotter than the bottom. However there may also be air in the radiator, which reduces the efficiency of the radiator. In that case, the radiator may need venting like this:

  1. Locate the radiator vent at the top left or top right of the radiator
  2. Using a radiator vent key, which you can get from any hardware shop, open the vent by turning the key anti-clockwise a small amount to allow the air to escape.
  3. As you turn the vent key hold a cloth safely around the vent to catch the radiator water that will start to leak out once all the air has been vented out.
  4. Quickly close the vent and tighten
  5. If you have a combination boiler ensure it is operating as efficiently as possible by checking your pressure now. Venting radiators lowers the pressure in combination boilers.

Low pressure on a combination boiler

Combination boilers are most efficient when they are at the correct pressure of between 1 and 2 bars. Pressure naturally drops over time, as well as whenever you vent a radiator, and you will need to top up the pressure from time to time like this:

  1. Check the pressure gauge on the boiler. If it is below number 1, add pressure using the filling loop normally located underneath the boiler
  2. Turn the knob on the filling loop anticlockwise to open it and slowly allow extra water into the heating system
  3. As soon as the pressure gauge reads between 1 and 2, turn the knob clockwise to close it.

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