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Maybe ground thaw is not what you need on your construction site. The 'Polar Guard' can be used to provide space heating to single level or multi-level buildings. This can be done by utilizing the HEATWAVE construction heater.

Construction workers can breathe easy knowing they have a comfortable safe environment to work in. The HEATWAVE provides clean comfortable heat inside while keeping the toxic fumes and the fire risk outside. This is done by pumping a propylene glycol heat transfer fluid from the 'Polar Guard' through the 200,000 btu/hr heating coil. The HEATWAVE Features a 6000 cfm fan for superior heat distribution and more comfortable heat. Add to that the portability, and heating a construction site becomes quick and easy.