The Heat Wave is safe, simple to operate and saves time at the job site. Provides the climate control you need for interior jobs without wasting time refueling, the need for dangerous fuel storage or the threat of poisoning from combustion by-products. Operation is simple. The Heat Wave's fan pushes ambient air over multiple heat coils, recirculating air within the room until it reaches the temperature level set with the units' thermostat. Unlike fuel-fired heaters, the Heat Wave can be left unattended.