(57) A heater in the form of a hot air gun 1 has a heat mass (8,9) capable of storing
heat energy from heat sources (13) and capable oftransfering that heat energy to a
fluid e.g. air to be heated. The air enters the gun 1 through inlet 6 and passes via
conduit 10, in which it is heated by contact with the heat mass (8, 9) to a plenum
chamber (11). A venturi (14) pumps the air from the plenum chamber (11) to an outlet
(5), via a conduit (12) where the air is again heated by contact with the heat mass
(9). The heat mass (8, 9) transfers heat to the air rapidly so that during a pulse
of air, much energy is transferred, but between air pulses the heat mass acts as a
reservoir of heat.
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