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How To Bleed Radiators On a Combi Boiler System

Sometimes a radiator can clunk and bang as it begins to warm up, other times it can remain cold long after you’ve turned your heating on. If this is the case, you may need to bleed your radiators.

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Simply answer a few multiple choice questions about your existing boiler and we’ll give you a fixed price for a new boiler including all parts and installation[28]

Radiators need bleeding when pockets of air get trapped inside. The air causes the radiator to circulate hot water less effectively and so less heat is emitted, meaning it will take longer to heat your home. Until you bleed your radiator to get rid of the air, you’re likely to be using more energy and therefore your energy bill could be higher than average.

Follow these steps to check and bleed your radiators:

  1. Put your central heating onto full and wait for your radiators to reach their maximum heat.
  2. Being careful not to burn your hands, feel along the top of each radiator for any cold areas. Cold spots are an indicator of trapped air, and so you’ll need to bleed any radiators on which you do find them.
  3. Before you bleed your radiators, ensure your heating is turned off and your radiators have completely cooled.
  4. Although a screwdriver can be used for some modern radiators, most radiators require a radiator key to bleed. If you don’t have a radiator key, you can pick one up from most DIY stores.
  5. Ensure you have a cloth below the radiator valve to catch any water.
  6. Holding the key with a cloth, slowly turn anti-clockwise to open your radiator’s valve. You should hear a hissing sound as the air escapes.
  7. Wait until the sound stops and water starts to leak out before turning the key clockwise to close the valve.
  8. Once all your radiators have been bled, check the pressure of your boiler gauge. If the pressure is too low, you’ll need to rebalance the pressure. If the pressure is normal, you can switch your heating on and check that there aren’t still any cold areas.

We recommend doing a full check of all the radiators in your home every couple of months.

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[28] Exclusions apply. See www.help-link.co.uk/fixed-price-quote-faqs/

[79] Online discount is available to domestic gas and LPG customers who receive an online quote for all boiler brands excluding Vokera. Discount will be applied as long as the quoted price is still applicable at the point of sale. Online discounted price is only available for the duration of the 14-day quote validity which starts from the day the quote was given. Offer is not available to Help-Link UK Ltd employees.

Online discount can be applied as follows:
All boiler manufacturer types excluding Vokera are eligible for a 5% discount off the final quoted price. Conventional to combi boiler swaps also qualify for an additional £50 discount after 5% initial discount is applied.

This offer cannot be used in conjunction with any other offers.
Offer available from April 2017. Any boiler quotations before this date will not be eligible for the discount post purchase. Help-Link UK Ltd have the right to withdraw or change the offer at any time.
Online discount is automatically applied when the customer gets a quote using the online quote system at www.help-link.co.uk and as long as the customer meets all the above criteria.