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Kerosene is also called Class C2 oil gasoline, or 28 sec oil gas. Where flue pipes are fitted to a heater, they have to be rated for 250 deg C (T250 rating). Diesel for heating is also called Class D oil fuel, Gas Oil, 35 sec oil gasoline, or Red Diesel. Where flue pipes are fitted to a official Alpha Heater site, they must be rated for four hundred deg C (T400 ranking). These fashionable garage heaters use diesel to heat up a large metal plate until it glows orange, radiating heat just like the sun. Small portable diesel heaters usually have gasoline tanks, whilst large heaters often must be connected to a seperate fuel tank. Direct or Indirect Heaters ? Most portable diesel heaters are direct fired, i.e. the fan blows heat straight from the flame. Indirect fired heaters are more expensive as they have a heat exchanger and a flue. The heated air is fume free, while exhaust gases go up the flue. Axial or Radial Fan ? Most portable space heaters have axial followers. For big air flows, and especially alongside long ducts, radial fans (centrifugal fans) are really helpful. For fans with massive air flow, three-part (400V) electricity is required. |
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