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4 Person Combination Bio Indoor Sauna: Dual Heating for Ultimate Comfort. Relax and rejuvenate in the luxurious 4 Person Combination Bio Indoor Sauna, crafted from premium Canadian Hemlock and designed for maximum comfort. Combining both infrared carbon fibre heating and a sauna stove, this versatile sauna delivers the best of both worlds—gentle, penetrating infrared warmth and the more intense heat of traditional sauna therapy.. The 4 Person Combination Bio Indoor Sauna combines the best in modern technology and traditional sauna experiences, delivering a luxurious and versatile solution for home wellness.