Hong Kong Misting

Outdoor heater

Conventional outdoor LPG heater:
Heat distribution is less even. Heat distributes from the top of the heater to people around by reflection. Heat distribution tends to be indirect. Most of the heat goes to the air at top of the heater before reaching people around. Heat distribution is less effective.
Modern outdoor LPG heater:
Heat distribution is even. Heat directly distributes from the glass tube at the post of the heater. Heat directly distributes to people around. This saves 40% of LPG for heating. 
(Left: conventional outdoor LPG heater
  Right: modern outdoor LPG heater)