We operate in and around Kent and offer a range of services including maintenance and installation facilities in domestic plumbing and heating and a quick response call out system to emergency calls. For reasons of health and safety in the home and the workplace it is recommended that gas appliances, such as boilers, gas fires, cookers and hobs are serviced at least once a year. J.G.M regard Gas safety to be of utmost importance. Carbon monoxide is a silent killer. It is a colorless, odorless, poisonous gas, produced by incomplete burning of carbon-based fuels.