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The Biogreen WM-P5 Warmax Power5 Paraffin Heater is a twin heater. You can decide to switch both of the heaters on or decide to have one running. The capacity is not as large so it will run for some time before needing a refill. The unit can be bolted to the floor to make sure that there are no accidental spills. The accidental fuel spills may be a hazard if left unattended.