If you live in a rural pocket of Somerset or the surrounding South West, your oil boiler is likely the heartbeat of your home. It keeps the kitchen warm and the showers hot, but as conversations around carbon footprints and net-zero targets reach our corner of the country, many homeowners are starting to look at that tank in the garden with fresh eyes. The big question we hear more often during our rounds is whether you can simply swap traditional kerosene for a greener alternative. People want to know if a biofuel oil boiler is a realistic prospect for an older farmhouse or a barn conversion without the staggering expense of a full system overhaul.

The short answer is yes, but it is not quite as simple as just pouring a different liquid into your tank. There is a specific type of fuel leading the charge, known as HVO (Hydrotreated Vegetable Oil), and it represents a massive shift in how we might heat our homes in the coming decade. For families who are not ready to pivot to heat pumps, this sustainable heating oil offers a middle ground that feels a lot more achievable.

What Exactly is HVO and is It Safe?

HVO stands for Hydrotreated Vegetable Oil. Unlike the biodiesel of twenty years ago which caused all sorts of clogging issues, HVO is a premium, fossil-free heating oil made from certified waste fats and oils. Because it undergoes a complex treatment process with hydrogen, the end result is a high-quality fuel that is chemically very similar to the kerosene you use now. It is stable, it does not mind the cold, and it burns remarkably cleanly.

In many ways, it is actually kinder to your equipment than traditional fuel. It reduces particulate emissions significantly, which is a fancy way of saying it produces less soot. When our engineers carry out an oil boiler service on a unit running HVO, they often find the internal components are in much better condition than those burning standard kerosene. For the environmentally conscious, the appeal is obvious: it can cut your heating carbon emissions by up to 90%.

Making the Switch: Oil Boiler Compatibility

You cannot simply mix HVO with your existing kerosene and hope for the best. To move over to a renewable liquid fuel, your system requires a relatively minor but essential conversion. The good news for Somerset homeowners is that most modern boilers are highly adaptable. If you are wondering is oil heating being phased out in the UK, this conversion is arguably the most practical exit ramp from fossil fuels for off-grid properties.

A typical boiler conversion for HVO involves a few key steps. An engineer will usually need to replace the fuel nozzle, adjust the pump pressure, and sometimes swap out flexible fuel hoses for versions that are compatible with biofuels. The seals in older pumps can sometimes perish when exposed to new fuel types, so we always recommend a thorough inspection of the burner assembly. It is a few hours of work rather than a few days of upheaval, making it much less intrusive than digging up the garden for a ground-source heat pump.

While the boiler itself is adaptable, you also have to consider where the fuel sits. We often get asked what size oil tank do you need for your home when switching, and the answer remains the same regardless of the fuel type. However, before switching to HVO, it is vital to ensure your current tank is bunded (double-skinned) and free from water contamination, as biofuels can be sensitive to impurities left over from years of kerosene storage.

Is It Expensive to Use Biofuel?

This is where the conversation gets a bit more grounded. At the moment, HVO is more expensive per litre than standard kerosene. This is partly due to production costs and partly because it does not yet benefit from the same tax breaks as fossil fuels. However, for many of our customers, the cost of the fuel is weighed against the massive upfront cost of switching to an entirely different heating technology. When you look at how oil heating compares to gas and electric, especially in older draughty homes, keeping your existing radiators and boiler while simply changing the fuel often makes the most financial sense in the long run.

To keep costs down, many households are becoming savvier about their ordering habits. Knowing what time of year is heating oil the cheapest can save you a significant amount, and the same logic applies to renewable alternatives. We also suggest looking at ways to save big on heating oil this season, such as improving insulation or upgrading your thermostat, to offset the higher price of eco-friendly boiler fuel.

What About Older Boilers?

If your boiler has seen better days, you might be questioning if it is worth the conversion. We often discuss how long an oil boiler lasts before replacement with our clients. If your unit is over 15 or 20 years old, it might be more efficient to install a new, HVO-ready condensing model. These machines are designed with modern fuels in mind and offer much higher seasonal efficiency.

If you are curious about current technology, you can find details on what is the most efficient oil boiler available to help you decide if an upgrade is better than a patch-up job. A new installation ensures you are ready for whatever fuel standards the next decade brings.

Maintaining Your System on Biofuel

Once you make the switch, maintenance remains your best friend. A biofuel oil boiler still needs an annual check-up to ensure everything is burning as it should. If you have ever wondered what happens during an oil boiler service, it involves cleaning the heat exchanger and checking the combustion levels. With HVO, these cleanings are often quicker because there is less carbon buildup.

Whether you are sticking with kerosene for now or moving to HVO, the question of how often you should service an oil boiler remains the same: once a year is the golden rule for safety and reliability. Regular maintenance also helps you spot issues early, like why your oil boiler is losing pressure, which can be a sign of a small leak or an expansion vessel problem that needs addressing before it becomes an expensive emergency.

Our team at South West Gas Services has extensive experience across domestic, commercial, and landlord properties. We understand the specific pressures of keeping a property warm in our region, whether that is a family home or a business. For those managing rentals, staying on top of these changes is part of your duty of care, just as much as knowing how often landlords need a gas safety certificate for their gas-supplied properties.

The Practical Reality for Somerset Homes

The South West is full of properties that simply are not suited to heat pumps without spending tens of thousands on new pipework and insulation. For these homes, HVO is a fantastic drop-in solution. However, we also have to be realistic about the current market. While the government is increasingly recognising that renewable liquid fuels like HVO are a vital part of the solution for rural areas, the infrastructure is still catching up.

In the meantime, there are plenty of small steps you can take to prepare. Learning how to improve the efficiency of an oil heating system now will pay dividends whether you stay on kerosene or switch to biofuel later. And remember, even in the middle of a Somerset winter, your system should be resilient. We often get calls asking does cold weather affect oil boilers, and while ancient kerosene can occasionally wax up in extreme freezes, modern HVO is remarkably stable in low temperatures.

Should You Make the Switch Now?

Deciding to move to a biofuel oil boiler is a personal choice based on your budget and your environmental goals. If your boiler is relatively young and in good health, a conversion is a very sensible way to future-proof your home. If you are at a crossroads, perhaps considering if you can switch from oil heating to gas or electric, we can provide a balanced view on the costs and practicalities involved.

At South West Gas Services, we pride ourselves on being a local team you can trust. We are not here to sell you a solution you do not need; we are here to help you keep your home warm, safe, and efficient. If you want to chat through your options or book an engineer to look at your existing setup, please do get in touch with us. Whether it is a simple service or a major conversation about the future of your heating, we are here to provide honest, straightforward advice for our Somerset neighbours.