Home heating systems LPG central heating

LPG Tank

LPG tanks can be bought or rented from your LPG supplier

How LPG central heating works

Although most households in the UK have mains gas central heating, around 4 million households are not connected to the mains gas network.

In parts of the UK with no mains gas, some homes use liquid petroleum gas (LPG) instead. This is normally used in a ‘wet’ heating system where an LPG-fired boiler heats water, which provides central heating through radiators and hot water through the taps in your home.

The main difference between mains gas and LPG is that the latter is delivered by road and stored in a tank, which you may have to buy or rent from your supplier. Some boilers designed for mains gas can be converted to use LPG.

Annual cost of LPG

The average annual cost for heating and hot water using LPG in the UK is £1,125 when consuming around 13,500 kWh a year.

This annual fuel cost is not based on actual fuel bills. It's derived from using the average cost of different types of fuel across the UK, sourced by Sutherland Tables, which collects domestic fuel pricing data. These costs (per kWh in pence) are then multiplied by the amount of kWh a medium energy user consumes on average in a year (13,500 kWh), as calculated by Ofgem.

Remember, this cost is just a guide to help you compare costs of different types of fuel. There are a number of factors that affect energy bills, including the age of a house and insulation, the efficiency of a hot water and heating system, and where you are in the UK.

Our guide to cutting your energy costs will help you to see where and how you can make changes to save money, no matter what type of heating system you have. 

You can also use our free energy switching service, Which? Switch, to see how much you could save on our energy bills.

Pros of LPG central heating

LPG is a highly efficient fuel, so you get a good return on every unit of energy. Modern condensing boilers, which use hot flue gases that are wasted in a standard boiler, now achieve efficiencies of 90% and more.

Replacing a standard LPG boiler with a highly-efficient modern condensing boiler is a relatively straightforward job. See our boiler reviews area for models from Which? Best Buy brands. It's also worth making sure you have good home heating controls - take a look at our heating control money-saving tips.

Which? members can find details of plumbers in their local area that have been recommended by other Which? members at Which Local

Cons of LPG central heating

LPG prices are likely to remain high as the UK competes with growing demand from other countries. The Office of Fair Trading investigated the off-grid energy market following sharp price rises in winter 2010 but concluded that the market did not need price regulation. You can read more about the market probe in our story: Heating oil homes to face another hard winter?.

As LPG is delivered by road there is a possibility that you could run out while you wait for your next delivery. However, systems that monitor the amount in your tank and automatically notify your supplier when it needs topping up are available.

Installing an LPG central heating system from scratch can be expensive and disruptive. The storage tank can also be unsightly (although this can be resolved by choosing an underground tank).

LPG boilers need servicing annually to ensure they run efficiently and last as long as they should do.

As a fossil fuel, LPG produces carbon dioxide when it’s burned and so isn't considered a clean source of energy.

LPG alternatives

You could consider installing a renewable heating system, such as water-heating solar thermal panels or a heat pump. An incentive scheme called the Renewable Heat Incentive, launched in 2013, pays householders for generating their own heat.

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