Choosing between a gas boiler and an oil boiler isn’t just about what’s available. It’s about long-term efficiency, maintenance needs, installation logistics and how well the system suits your home. At Lonsdale Plumbing & Heating, we install and service both systems, so we know exactly what to look out for and what homeowners should consider. Here’s what separates gas boilers from oil boilers and how to work out what’s right for your property.

1. How Each Boiler Works

Gas Boiler Installation

A gas boiler uses natural gas as fuel. It’s connected to the national grid, meaning no fuel deliveries are required. Gas is burned to heat water, which circulates through your radiators and taps.

Oil Boiler Installation

An oil boiler runs on heating oil stored in a tank on your property. It works similarly by heating water for radiators and taps but requires regular oil deliveries to top up the tank.

2. Fuel Supply & Storage

Gas Boilers

• No storage tank required
• Supplied via mains gas
• Available in most towns and cities

Oil Boilers

• Needs a secure external oil tank
• Fuel delivered by a supplier
• More common in rural areas without gas supply

If your property isn’t connected to the gas network, an oil boiler is likely your best option.

3. Installation Considerations

Gas Boiler Installation

• Quicker to install where gas mains are available
• Less external equipment (no tank)
• Compact combi models available

Oil Boiler Installation

• Requires external tank setup
• May involve more groundwork or pipework
• Suits properties with larger heating demands

We install both types and will advise on what suits your layout and heating needs.

4. Boiler Maintenance Requirements

Regardless of the type, boiler maintenance is essential. Skipping annual servicing can lead to reduced efficiency, higher fuel costs and even safety risks.

Gas Boiler Maintenance

• Annual service required to keep the system efficient
• Check-ups include burner cleaning, flue inspection and safety checks
• Must be carried out by a Gas Safe registered engineer

Oil Boiler Servicing

• Also requires an annual service
• Involves filter replacement, nozzle cleaning, tank inspection and safety testing
• Engineers must be OFTEC registered

At Lonsdale, our engineers are qualified for both gas boiler servicing and oil boiler servicing, so whichever system you use, we’ve got you covered.

5. Running Costs and Efficiency

Gas Boilers

• Typically cheaper to run due to lower gas prices
• Modern condensing gas boilers are highly efficient (90%+)

Oil Boilers

• Slightly higher running costs depending on fuel prices
• High-efficiency models still available (also 90%+ when properly maintained)

Boiler performance also depends on regular servicing and system age. Newer models with smart controls often offer better fuel savings.

6. Environmental Impact

Natural gas is considered a cleaner fossil fuel than oil but both systems have environmental considerations. Newer systems can lower emissions, especially when combined with renewable tech like solar thermal or heat pumps.

The government is phasing out fossil fuel systems in new builds from 2025 but for existing homes, both gas and oil boilers remain legal and widely used.

7. What Happens After Installation?

Regardless of the system, you’ll need:

• An annual boiler service to maintain efficiency and safety
• Pressure and temperature checks
• Regular bleeding of radiators and visual inspections

Lonsdale Plumbing offers boiler service and maintenance packages to help you stay on top of it without the hassle.

Final Word: Which Boiler Should You Choose?

If you’re connected to the gas grid, a gas boiler installation will usually be more convenient and cost-effective. If not, oil boiler installation offers strong performance for off-grid properties. Either way, the right system depends on your home’s layout, heating demands and fuel access.

For honest advice, experienced installation and reliable boiler maintenance, Lonsdale Plumbing & Heating can help. Whether it’s a new system or servicing your current one, our team is here to make sure your boiler works as it should.

Visit Lonsdale Plumbing or give us a call to book your consultation or annual boiler service.