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Hints and Tips from Appollo Gas Services

Plumbing & DIY Resources

We are delighted to launch our new helpful hints and tips section combined with our latest news from the front line at Appollo Gas Services.

Call back often to keep up to date with our latest posts and news updates.

Stay Safe and Keep Warm!


Corporate Social Responsibility

Here at Appollo, we firmly believe in being a responsible business and committing to Corporate Social Responsibility.  CSR activity covers our approach to getting greener, engaging our people and treating them in the right way, learning and development, our focus on...

Boiler installations sunderland

Thankyou APPOLLO GAS SERVICES my boiler installation in Sunderland went exactly to plan without a hitch. Expert job.  MRS HIND 18/09/2012


Frequently Asked Questions

How to bleed a radiator

Over time it is normal for air to build up in your radiators which can affect their efficiency. When air builds up it will mean some areas of radiator will be colder than others. You can normally tell if your radiators need bleeding as they will be colder at the top than at the bottom. If this is the other way round (cold at the bottom and hot at the top) this could mean that sludge has built up in your radiator and you might need your system cleaned.

Step by step guide – How to Bleed a Radiator 

  1. First of all, turn your heating on and wait for the radiators to warm up. Check all radiators and identify which radiators might need bleeding.
  2. Turn off your heating system and wait for the radiators to cool
  3. Insert your radiator key into the bleed screw in the bleed valve which will be at the top of your radiator. Make sure you have a cloth or rag ready to hold under the bleed valve to catch any drips.
  4. Turn the radiator key anti-clockwise to open the valve. You will hear a hissing sound (this is the gas escaping). Some water might escape.
  5. Keep the radiator key turned until water starts to flow steadily and then turn the radiator key clockwise to close the valve.
  6. Use the cloth to catch the drips and clean up any excess water.
  7. When you have bled all the affected radiators, turn the heating system back on. Check treated radiators to make sure they are now warm all over.
  8. After you have finished bleeding all the radiators, make sure you top up the pressure on your boiler. Boiler pressure can be lost when bleeding radiators. If you need help topping up the boiler pressure, view our guide here.


Should I have my heating system treated or cleansed?

Mostr manufacturers thoroughly recommends the good practice of cleansing a heating system as an important part of the boiler installation process. The recommendations within BS7593 should be followed, whilst also paying attention to notes within the boiler’s installation and servicing instructions and those instructions as directed by the flushing agent manufacturer. It is best practice to cleanse an existing heating system prior to installation of the new boiler. After the boiler has been installed, the heating system should be cleansed of debris and refilled with inhibitor.Appollo Gas Services are fully conversant with all current standards/regulations relating to this part of the installation

The heating system is constantly losing pressure what should I do?

If you are constantly losing pressure in the heating system you could try the following to establish the cause by:

Checking all visible joints including radiator valves and connections for obvious signs of leakage. There needs to be consideration to potential leaks to any under-floor pipe work.

Check that there is no water being discharged from the pressure relief valve (sometimes referred to as an overflow). This pipe usually goes from the boiler through to an outside wall and terminates outside. Check this for signs of dripping. If it is wet, this may mean that the pressure relief valve is faulty.

In either case, if your heating system keeps losing pressure to gain advice or help you should:

    • Contact Appollo Gas Services your local Worcester Accredited Installer

How often should I need to top up the pressure in the heating system?

When the heating system is cool, the pressure should be between 1 and 1.5 bar on the pressure gauge (the indicator needle would usually be in the green section). If pressure is below 0.5 bar (down in the red section), water has been lost from the system and must be replaced. Note: The red part of the dial could also indicate the pressure being too high (about 2.75 bar or more). If the pressure gauge indicates high pressure as a result of over filling, you will need to bleed a radiator until the pressure gauge returns between 1 and 1.5 bar.

Read our guide on how to repressurise your system.

If pressure rises by more than 1 bar when the heating is up to temperature then the expansion vessel may require repressurising. This will require a service engineer. The pressure in the system will usually require topping up once or twice a year. If you are having to repressurise your heating system much more frequently, please contact Appollo Gas Services.

How do I know that my condensate pipe is blocked?

There are 2 main indicators that your boilers condensate pipe may be blocked.

1. The boiler may make a gurgling sound when attempting to start.

2. The boiler may repeatedly ‘lock out’ or stop working and the display may show an EA code.

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