Oil System Boilers

Keep heating systems running smoothly with our range of oil system boilers. Made for off-grid homes with a separate hot water cylinder, a system oil boiler includes key components inside the unit for quicker installs and easier maintenance. Ideal for larger rural properties or households with higher water demand, we stock oil system boilers from trusted brands, built for efficiency, reliability and long-term use. Don’t forget to pick up flue kits, cylinders and controls to get the full oil boiler setup ready to go.

Q: What is an oil system boiler and how does it work?

A: An oil system boiler heats water for both central heating and hot water, using oil as the fuel source. Unlike heat only systems, it doesn’t need a cold water tank - instead, it takes water directly from the mains and stores hot water in a separate cylinder, ready for use. This makes it a space-saving and efficient option for homes with higher hot water demand.

Q: How is a system oil boiler different from an oil combi or heat only boiler?

A: A system oil boiler sits between a heat only and combi boiler setup. It still uses a hot water cylinder like a heat only boiler, but it doesn't require a cold water tank in the loft. Unlike an oil combi boiler, it stores hot water in advance, making it better suited to households with multiple bathrooms or where hot water is needed at the same time in several places.

Q: What type of heating system is an oil system boiler suitable for?

A: Oil system boilers are ideal for homes with multiple bathrooms or larger hot water needs, especially in off-grid areas without a gas supply. They're a good choice for replacing older regular boilers, especially if your property already has a pressurised hot water cylinder in place.

Q: How much does it cost to replace an oil system boiler?

A: The cost of replacing an oil system boiler varies depending on:

• The boiler size and model.

• Whether you're switching from a different boiler type.

• If you're also upgrading your hot water cylinder or controls.

On average, a new oil system boiler can cost between £2,000–£4,000 for the unit, not including the cost of installation. For an accurate price, speak to your installer or local JT Atkinson branch.

Q: How long does 100 litres of heating oil last in winter?

A: Usage depends on the size of your home, insulation, and boiler efficiency. As a rough guide, 100 litres could last around 1–2 weeks in cold weather for a small, well-insulated property, but less in larger homes with high heating demand. Installing a modern, efficient oil system boiler can help reduce oil consumption and running costs over time.

Q: Can I buy an oil system boiler online from JT Atkinson?

A: Yes – you can order oil system boilers online with UK delivery or collection from your local branch. If you're unsure whether a system, combi or heat only boiler is best, we can help you find the right option for your heating setup.