Replacement Oil Boilers Cost

Pictures of Navien Oil Boilers | Letsgo TNT Gas & Heating Engineers

When it comes to heating your home, an oil boiler is a reliable and efficient choice. However, like any other appliance in your home, it will eventually need replaced. If you’re considering replacing your old oil boiler with a new one, you’re probably wondering about the costs involved. This blog post will provide an in-depth look at the replacement oil boilers cost and what factors can influence these costs.


The Average Cost of Replacement Oil Boilers

The cost to replace an oil boiler can vary greatly depending on several factors such as the type of boiler, its size, and the complexity of the installation process. On average, homeowners can expect to pay between £4,000 and £7,000 for a new oil boiler installation. However, complex jobs with a great deal of pipework alterations could take the price even higher.

It’s important to note that these prices usually include both the cost of the new boiler and labour charges for professional installation. Keep in mind that while it might be tempting to save money by installing the boiler yourself, this is generally not recommended due to safety concerns and potential warranty issues.


Factors Influencing the Cost of Replacement Oil Boilers

Several factors can influence how much you’ll pay for a new oil boiler:

Type of Boiler

There are several types of oil boilers available on the market today: combi boilers (combination), system boilers, and conventional (or regular) boilers. Combi boilers are typically more expensive than system or conventional ones due to their ability to provide hot water on demand without needing a separate hot water cylinder.

Size and Capacity

The size and capacity of your new boiler will also affect its price. Larger homes or buildings require larger boilers which are more expensive than smaller ones. Similarly, if you have multiple bathrooms or use a lot of hot water simultaneously (for example in commercial settings), you may need a higher-capacity boiler which will also increase costs.

Installation Complexity

The complexity of the installation process can greatly affect labour costs. If your new boiler is similar to your old one and no major modifications are needed during installation, labour costs will be lower. However, if significant changes are required – such as relocating the boiler or modifying pipework – this could significantly increase labour costs.

The boiler below is an example of what type of boiler you require. It is a regular boiler that would be fitted to an existing hot water cylinder and heating controls. If the controls are as old as the boiler, it is highly recommended to replace them as well.

warmflow regular oil boiler


Additional Costs When Replacing an Oil Boiler

In addition to the cost of replacement oil boilers themselves and their installation fees, there may be other associated costs:

Removal and Disposal

You’ll likely need to pay for removal and disposal of your old boiler which could potentially add a couple of hunderd pounds  onto your total bill.

 Upgrading Heating System Components

If other parts of your heating system are outdated or incompatible with your new boiler (such as motorised valves or thermostats), these may also need replacing which would add further costs.

 Oftec Compliance

Compliance with Oftec regulations may require additional work such as an oil tank that does not meet the required standards, which again could add a further expense. Please note that anyone installing an oil boiler in England must be oftec registered. However, in Scotland there is no legal requirement but you should still do your due dilligence that the installer is experienced with oil installations and is competent with replacement oil boilers.


oftec compliance


Which Oil  Boiler Should I Choose?

There are a few oil boiler manufacturers in the UK to choose from but it very much depends on what your budget would be or how much of a warranty would you require. Don’t forget, oil boiler parts are generally much more expensive than gas boiler so you should bear this in mind before making any decision.

If your buget is in the lower end, a good choice would be  Warmflow oil boilers. These boilers are generally in the lower end of the average cost of replacement oil boilers and would come with a 5 year warranty if installed by an accredited installer. You can also get a 7 year warranty but an additional charge would apply.

A good mid range oil boiler that comes with a 10 year warranty out of the box would be the Navien. They have a wide range of oil boilers and would cost in the region of £4,00 to £5,000 to have installed.


Higher end oil boilers are both Worcester or Grant. They have been in the market in the UK for a long time and have a great reputation for being quality. However, there is a setback as they come at a much higher price than the previous models that we suggested. Prices would start around the £5,000 upto around £7,000 depending on what size of boiler and if it is a regular boiler or a combi.



grant oil boiler

Check with your local oil boiler installers and get them to come give you a quote before making any decisions on which oil boiler you think is best for you.



While replacing an oil boiler can be expensive upfront – especially when considering additional associated costs – it’s important not forget about potential long-term savings. A modern energy-efficient oil boiler could save you hundreds of pounds each year on heating bills compared with older less efficient models.

Moreover, having a reliable heating system that won’t break down in cold weather is priceless for many homeowners. Therefore when considering whether it’s worth replacing your old oil boiler with a new one – consider not just initial outlay but also long-term savings and peace-of-mind benefits.

Remember that prices vary widely depending on individual circumstances so always get multiple quotes before making any decisions.

We hope that you got some value from this blog post and would love it if you could share with friends or family on your social feed. If you need a new oil boiler, we would be happy to help give you a quote.

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