Constructed of heavy duty stainless steel, the NordicStove Rustic is a convection heater available in model sizes: Rustic 250 (25,000 BTU), and Rustic 400 (40,000 BTU). This unique heating versatility works for a wide range of heating requirements. The Rustic features a viewing window. NordicStove heaters require no electricity. Ideal for heating your boat, cabin, or home. Heavy stovetop is perfect for cooking.