The company was formed in 1935, and is one of the UK's largest suppliers of liquefied petroleum gas (LPG). It is currently servicing around 4 million homes and businesses, supplying LPG to power gas appliances from central heating and hot water, as well as cookers, fires and barbecues. The company predominantly supplies LPG to homes in rural areas where there is no mains natural gas supply. In the United Kingdom, Calor is part of the SHV Gas Group a private Dutch company. Calor originally dealt only with cooking and heating appliances, but now covers a wider range of products for home, business, and automotive fuels.