Oil Boilers Explained...

Oil boilers are usually installed in remote areas where the property does not have access to the gas grid.

Frequently asked Questions:

🔄 Replacement & Ban - Check for Current Changes in Legislation.

You can still fit oil boilers but check for current changes in legislation.

Can I replace my oil boiler with an electric boiler?

It’s a feasible and increasingly popular swap, especially for homes off the gas grid. Here's what you need to know:

🔧 How It Works

• The replacement involves removing the old oil boiler, oil tank, and associated pipes, then installing an electric boiler—no flue is needed, and plumbing connections remain largely the same

• You'll need a suitable electrical supply, often requiring a dedicated circuit or even 3-phase power for larger models

💷 Cost Overview

• Installation cost: Roughly the same range as other new boilers—£1,500–£5,000

• Annual running cost:

  • Electric boiler: approx. £1,700/year average

  • Oil boiler: £620–£1,260/year, so electric is around £400–£1,000 more

Alternative Greener Options

• Heat pumps are more energy-efficient (3–5×), have lower running costs, and are supported by grants—but have higher installation costs and space requirements

• Hybrid systems, on-site renewables (like solar PV), or heat batteries can offset costs and improve electric systems economics .

🔧 Maintenance & Replacement Advice

Should I replace my 20-year-old oil boiler?
👉 Yes, modern boilers are more efficient (~90% vs ~60–70%), saving on fuel bills and reducing emissions. 20 years is near or beyond typical lifespan.

How much does it cost to replace an oil boiler with a gas boiler?
👉 Typically £3,000–£5,000, depending on boiler type, gas supply availability, and installation complexity (plus cost of connecting to gas network if needed).

What is the life expectancy of an oil boiler?
👉 Around 15–20 years with good maintenance.

🛠️ Servicing & Tank Maintenance

How often should my oil boiler be serviced?
👉 Annually—to maintain efficiency, safety, and manufacturer warranty.

Should my oil tank be checked?
👉 Yes—annually, or when refilling. Look for signs of rust, cracks, leaks, or water ingress.

What should I do if my oil tank has a leak?
👉 Stop using it immediately. Contact your oil supplier and an OFTEC-registered technician. Notify the Environment Agency if spillage reaches soil or water.

How do I check how much oil is in my tank?
👉 Use a manual dipstick or check the tank's built-in gauge. Many tanks now have digital monitors.

What is a Watchman and how does it work?
👉 Watchman is a wireless oil tank monitor. It uses an ultrasonic sensor in the tank to measure oil level and sends data to a receiver in your home, showing how much oil remains.

🛢️ Oil Usage & Costs

How long should 1000 litres of oil last in winter in the UK?
👉 For an average 3–4 bedroom house, 2–3 months, depending on insulation and usage.

How many litres of oil does a 3-bedroom house use?
👉 Approx. 1,500–2,000 litres/year on average.

Our engineers are here to carry out safety checks, maintenance and installation on oil boiler, tanks and systems. Book a call.