Book an appointment

Open today from 8am - 8pm

0203 841 5320

Gas Safe Register logo

Gas Safe Register

Gas Safe Register is the official gas registration body for the UK, Isle of Man and Guernsey, appointed by the relevant Health and Safety Authority for each area. By law all gas engineers must be on the Gas Safe Register.

Visit the Gas Safe website to verify our accreditation

Get my quote

Why Is My Boiler Making Loud Noises?

If your boiler is making loud, gurgling sounds or your pipes are unusually loud, it is important that you identify the root of the cause as soon as possible. Here are some common causes of a noisy boiler.

Get your instant quote online

Price Guarantee[28]

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]

Unusual noises in your pipes can be a sign of 'kettling' which is a result of a buildup of limescale within the heat exchanger and can cause ongoing issues in your central heating system. These noises can also be heard if you have low water pressure or a pump failure.

If you react quickly to these signs then the steps to fix the issue could be less complicated and more cost-friendly, you could even save the need for a new boiler.

You will need to call in a Gas Safe heating engineer to repair the issue, but here are some steps you can take to discover the root of the problem first.

Limescale in your heating system

If your boiler is making a loud banging noise, it could be a cause of steam bubbles produced by a build-up of scale. Limescale can be considerably damaging and have a significant impact on the lifespan and energy efficiency of a central heating system. It causes 'hot spots' which are generally treated with a chemical descaler.

How to use a chemical descaler:

  1. Shut down the system
  2. Add the product to the feed and expansion tank and leave it for a few days
  3. Drain, flush and refill the system

Faulty or incorrectly set thermostat

A noisy boiler could be caused by having your thermostat set too high. To stop your boiler making noise, you could try lowering the temperature on your thermostat. Although your home might not be as warm as you'd like, the level of noise from your boiler should quieten.

Insufficient water flow

Poor water flow can often be to blame for boiler noise. Here’s how you can investigate this potential cause further:

  1. First of all, you should check that the mains water is switched on. The feed and expansion tank (usually found in the loft) should also be checked if the mains water is switched on.
  2. The float valve can be examined by turning off the power supply to the boiler and then make sure that the float valve isn't stuck in the tanks. If you find that the valve is stuck, be sure to reposition its metal arm to release it. 
  3. Cold weather can result in frozen water pipes which can cause the noises in your central heating system.

Insufficient water pressure

A lack of water pressure can sometimes cause your boiler to make noises. Check the pressure indicator on your boiler and increase if necessary. Find our guide on how to re-pressurise your boiler here.

Boiler repairs should by law always be carried out by a qualified and Gas Safe engineer, so you should never attempt to carry out any repair work on your boiler yourself. Go to Service & Repairs to book an appointment with one of our expert engineers or give us a call on 0203 805 4581 .

Get in touch with us today

We’re all about the personal touch, so fill in the form below to give us an idea of where you are and one of our local advisors will give you a call back quick-sharp.

0203 841 5320

Simply fill in this form and we’ll call you straight back.

Book your free no obligation quote today.

When you submit this form, you’ll be contacted by HomeServe.

HomeServe would like to send you offers and services we think you‘ll like. If you‘d prefer NOT to receive this information, please click the options below.

Our pledge to you:

  • We promise we won’t inundate you
  • We’ll keep it relevant
  • We’ll never share your details with any third party

Read our privacy policy.

Tools icon

Service & Repairs

If you know exactly what you‘re after, call the number below

0203 805 4581

[28] Exclusions apply. See