21.   The heating system was by hypocaust in which hot air from furnaces under the building was passed through hollow tiles and bricks in the walls and floor.

22.   Energy Minister S. Krishnakumar said that governments, the public sector, the defence services and the railways, must use solar heating systems.

23.   A quick response heating system may be most satisfactory or indeed radiators backed up with electric convectors.

24.   The work will include cavity wall insulation, roof insulation, double glazing and installation of energy efficient heating systems.

25.   New heating systems will be installed along with double glazing and a major brickwork programme.

26.   An inquest heard that a catalogue of faults and errors were detected in valves, hot water sensors and the heating return system in the new building.

27.   Among companies mentioned was Blue Circle Industries Plc of the U.K. and Atag Holding AV, a Dutch appliance and heating systems maker.

28.   And all eyes, and blue noses, turned to city hall, which controls the Soviet-era, centrally planned heating system.

29.   And heating systems that run relatively cleanly, especially natural gas and propane systems, often have smoke so clean that it can go unnoticed.

30.   And, furnaces and ductwork are cheaper to install than a boiler and a hot-water heating system.