A broken or faulty boiler can be an aggravating and potentially expensive problem to fix. Make sure you don’t get overcharged – we reveal how much it costs to fix the 10 most common boiler faults.
You shouldn’t attempt to repair a boiler yourself – you’ll need an accredited boiler engineer to complete the work. If you read on, we will help you discover how much different boiler spares, parts and repairs usually cost, to give you an idea of how much you can expect to pay.
You can minimise how much you have to spend on repairs by making sure you have a reliable boiler that won’t let you down.
10 most common boiler faults. Scroll down further in this guide for more detail in our table. Boiler parts and replacement costs Prices shown below are the average price quoted by our suppliers.
Diverter/zone valves £98 Directs flow of heated water from the boiler for heating or hot water
Printed circuit board £259 The ‘brain’ – it makes things run together
Water Pump £131 Moves heated water from the boiler, for either heating or hot water
Fan for combustion £169 Moves air through the boiler for combustion
Gas valve £102 Regulates gas flow to the burner
Overheat thermostat around £30 Prevents boiler from overheating
Automatic air vent under £20 Lets air out of the boiler
Pressure relief valve £40 Safety component that ensures pressure does not become dangerous
Thermocouple (only found in older boilers) £25 Essential component in preventing gas leaks if your pilot light goes out
Ignition £50 Ignites the pilot/main flame Getting a good deal on boiler spares and parts
You shouldn’t attempt to remove your boiler’s outer casing to take a look at what’s wrong, so it’s unlikely you’ll know which spare parts your boiler might need until advised by a professional. It can be difficult to get hold of boiler spare parts yourself anyway, because many of the reputable spare part retailers and online outlets that sell spare parts for household appliances – websites like Espares or Partmaster, for example – don’t offer boiler spares. While several other boiler spares outlets are for trade use only. Choosing a qualified and reputable boiler engineer is important when getting any work or repairs done. Ask friends and family, or look on past reviews for recommendations for reliable traders and ask for a breakdown of the quoted costs, including boiler spares, parts, call-out fees, labour and VAT costs.
Boiler services A regular boiler service should help prolong the life of your boiler and its parts. But you could be better off putting money aside in a cash Isa in the event of having to pay for boiler repairs, rather than signing up for an annual boiler service contract. A typical boiler service costs between £80 and £120 in London. If you want to find out more about boiler servicing, then find out which servicing contracts are rated the most highly by people who use them.
Repair or replace? Determining the so-called tipping point at which it becomes more economical to replace an old, less efficient boiler with a high efficiency A-rated boiler can be tricky given how expensive a new boiler installation can work out. But if you’re experiencing problems with your boiler and have to pay out for repairs, it could be an opportune moment to weigh up the boiler parts and repairs bill against replacing your boiler, offset by the savings you’ll make by switching to a more efficient heating system. The amount you’ll save will depend on the brand, age and type of boiler. You can see typical energy savings calculations.
Boiler brand parts and spares If you have decided to get your boiler repaired instead of replaced, it’s important to know how your boiler brand operates when it comes to repairs. Below we talk you through the repair service for a number of different boiler brands. Ideal, Valliant and Worcester Bosch boiler parts Ideal, Valliant and Worcester Bosch do not sell boiler spare parts to members of the public – only professionals can order boiler parts or download technical specifications for your boiler model. So a boiler engineer will usually obtain or order the correct Ideal, Valliant or Worcester Bosch boiler parts to fix your boiler for you. Whichever brand of boiler you have, ask for a breakdown of the spare parts your engineer is ordering, and their respective costs including VAT, or ask to see the product catalogue they’re ordering from to ensure you’re getting a fair rate on the spare parts. It’s also worth taking a look at your Ideal, Valliant and Worcester Bosch boiler manual to check what your warranty covers you for and for how long, as well as contact details for troubleshooting advice. You can download boiler manuals for current Vaillant models via the Vaillant website. Vaillant also has a technical helpline for homeowners – call it on 0906 802 0251 (calls cost 60p a minute from a BT landline). For Worcester Bosch you can download boiler manuals via the Worcester Bosch website. Worcester Bosch also has a technical helpline for homeowners – call it on 01905 754 624 (calls cost 60p a minute from a BT landline). We’ve reviewed a number of Ideal, Vaillant and Worcester