Put in a boat's engine bay to keep it above freezing over the winter. UL-1500 ignition protected and built to USCG guidelines, which is the whole point - an engine compartment has fuel vapor in it and a regular shop heater does not belong anywhere near one. Keeps up to an 80 cubic foot engine compartment above freezing down to -4F outside. Comes with a 20 ft heater-grade cord and the quick-mount bracket. Thermostat controlled, so it cycles itself.