The Honeywell FSW-505E Frost Watch Heater is a compact electric heater for the heating of small rooms. It MUST be wall mounted and is an ideal protection for facilities with frost risk damage, e.g. toilets, little greenhouses, accomodation for animals and caravans. The direct thermostat regulation controls the unit automatically between the temperatures of -3C to +30C, and a low wattage means you could regulate the temperature in your caravan constantly. The frost watch function is an excellent and useful feature, it kicks in automatically when the room temperature drops below 5C to automatically start the heater operating- keeping the room temperature at a sensible level. An over heating shut off feature also provides additional safety should the heater get too hot. This useful and compact heater also comes with a 3 year warranty.