The current contract for Non-electric air heaters or hot air-distributors in Bristol is projected to end on 15/12/2017 and may be available for re-tender.The current contract for Non-electric air heaters or hot air-distributors in Bristol included Non-electric air heaters or hot air-distributors. Air heaters. The Authority has a 4 year requirement for the supply and delivery of Kerosene heaters and spares, to provide tri-service support to UK and overseas operational units. Delivery will be required to UK Army, RAF and Navy Stores, as well as directly to UK units. The Kerosene heater will need to be portable; have a capacity of 2.5-3KW; meet Paraffin class C1 to BS 2689 (Military designation Kero A) UN no. 1223 standard; have a facility for the fuel tank to be removable and include a safety and air quality control system.