Sudden frosts can harm delicate plants and cause water pipes to freeze causing untold damage if they burst our frost watcher a freestandingwall mounted heater can help prevent such problems with a 500w output the unit has a variable thermostat with frost protection making it suitable for greenhouses sheds caravans loft spaces and more with an ipx4 rating most models are ipx2 it is far superior to similar products on the market and is totally safe to use in damp and wet environments