Both LPG and oil give off-grid homes full central heating and hot water. Oil has typically been the cheaper fuel per unit of heat and lets you buy from any supplier. LPG boilers are more compact and cleaner-burning, and LPG allows combi boilers and gas cooking, but supply is often tied to a contract with the company that owns the tank.
The right choice depends on space for a tank, your existing system, how you like to buy fuel and current prices. Our LPG boiler installation and oil boiler installation pages cover both.
Side-by-side comparison
| Oil | LPG | |
| Fuel storage | Oil tank, often bunded | Tank (above or below ground) or cylinders |
| Tank ownership | Usually owned by the homeowner | Often owned by the supplier |
| Buying fuel | Shop around between suppliers | Often tied to supplier contract |
| Boiler size | Often larger, sometimes floor-standing | Compact, wall-hung options |
| Combi boilers | Available but less common | Widely available |
| Emissions | Higher | Lower |
| Servicing | OFTEC registered technician recommended | Gas Safe engineer qualified for LPG |
| Cooking | No | Gas hob possible |
Running costs
Running costs depend on current fuel prices, boiler efficiency and how the system is set up. Prices for both fuels move, sometimes sharply, so compare up-to-date quotes rather than relying on older figures. With LPG, the price terms in your supply contract matter a great deal.
Space and siting
Both tanks must meet siting rules on distances from buildings, boundaries, drains and ignition sources. Oil tanks may need bunding depending on size and location. LPG tanks have separation distances for safety. An installer will check the options for your property.
When LPG tends to suit
- You want a compact boiler or a combi
- There’s a suitable spot for an LPG tank
- You’d like a gas hob
- You’d rather avoid oil storage and the risk of spills
When oil tends to suit
- You already have a good oil tank and system
- You want to shop around for fuel
- LPG contract terms don’t appeal
- The existing system is designed around a regular or system boiler
Don’t forget heat pumps
For many off-grid homes, an air source heat pump is worth comparing too. It compares more favourably against oil and LPG than against mains gas, and grants may be available. It depends on insulation, radiators and space, so it needs a proper survey.
Off-grid homes in Oxfordshire
Villages around Witney, Thame, Bicester and Princes Risborough include many homes without mains gas. Older stone properties often have oil systems that have been in place for decades. When the boiler needs replacing, it’s a good moment to compare all three options. Our guide to upgrading your heating system explains what’s involved.
Frequently asked questions
Can I switch from oil to LPG?
Yes. It involves removing or decommissioning the oil tank, installing an LPG tank and supply, and fitting an LPG boiler. Radiators and pipework can often stay.
Is LPG safer than oil?
Both are safe when correctly installed and maintained. They have different risks: oil spills for oil, and gas leaks for LPG. Annual servicing and a carbon monoxide alarm are important for both.
Which lasts longer, an oil or LPG boiler?
Lifespan depends more on the boiler quality, installation and servicing than the fuel.
Get advice for your home
Weighing up LPG or oil? Give us a ring on 01865 602 994 or drop us a message and we’ll talk you through the options for your home.
