This product has saved me $k! The majority of uk homes rely on gas central heating, but a small selection are not connected to the mains supply, and so rely on oil-powered boilers (if this applies to you, skip to 'oil boilers' below). Please drop us a line below and we'll get in touch with you shortly! This promise exceeds your legal rights under the consumer contracts regulations. The staff at monkey wrench is a friendly bunch that are here to make.