The SaunaLife SOAK-Series Model S4B represents the very best in wood-burning hot tub quality, efficiency, and luxury. Thermo-Spruce materials (lasts up to 2X longer than Cedar) Luxury outdoor wood-burning hot tub Designed for outdoor ergonomic hot tub bathing experiences Arrives fully assembled and no electricity required (eco-friendly) Spacious interior holds over 304 gallons of pure water bathing pleasure Thick dark grey contoured fiberglass lining provides enhanced bather comfort Stainless steel wood-burning heater utilizes dual heat compartments for unmatched efficiency Rapid response heat-up time prepares water to ideal temperatures in under 2-hours Wood-burning heater constructed of 304 stainless steel Polished stainless steel chimney with protection Durable Thermo-Spruce tub surround (1.65" thick), painted black Superior thermal resistance (R-value) to retain heat Matching Thermo-Spruce wood steps for easy access Extra thick steel reinforced foam cover, folds for ease of removal and storage Dark grey marine grade vinyl cover exterior Integrated hot tub drainage tap Exterior dimensions - 79" diameter and 37" high Interior dimensions - 71" diameter and 33" deep Designed by SaunaLife and handcrafted in Northern Europe Thermo-Spruce Material Advantages Lasts up to 2X longer than Cedar Superior thermal resistance (R-value) Polished stainless steel chimney