Liquefied Petroleum Gas (LPG) is normally either Propane or Butane, both of which can easily be stored as liquids under moderately high pressure. The liquid gas will, typically, be stored in pressurised cylinders outside, but close to, the home and used to fuel the home’s boiler/radiator system. Following use, the cylinders will either be replaced by the LPG supplier, or the customer’s LPG storage tank will be replenished by a visit from the retailer’s road tanker. The running cost of an LPG heating system is high – around 45% higher than the mains gas equivalent. Another consideration is the limited number of LPG suppliers in certain parts of the country; sometimes the company that installs the tank will be the only supplier that can refill the gas, preventing customers from shopping around. LPG prices can be volatile and tend to be seasonal.
Pros: Flexible to use. Re-ordering can be automated, with a supplier fitting a level sensor and telemetry to their supply depot.
Cons: Could be expensive to install – particularly if central heating is not already fitted. Limited choice of suppliers. A LPG tank requires space in the garden and annual servicing. Running costs can rise further if the householder does not, or cannot, plan LPG purchases to avoid the more expensive periods (typically in the winter).
Indicative annual running cost: with an older boiler – £1,495; with a new condensing boiler – £1,235