The SaunaLife SOAK-Series Model S4N represents the very best in wood-burning hot tub quality, efficiency, and luxury. The Model S4N wood-fired hot tub arrives completely assembled and is easy to set up. Its ergonomically shaped fiberglass tub is a comfortable place for up to 6 people. The interior surface is easy to clean, and the exterior is crafted from thermally enhanced spruce for superior weather resistance and durability. Engineered for efficiency and performance Engineered and crafted in the Northers Europe, this super-efficient hot tub heats in 1/3 of the time as traditional wood-fired hot tubs. No electrical connection is required. At the heart of the Model S4 is its ingenious self-cleaning corrugated stove with a secondary chamber that transfers heat from the smoke - reducing wood consumption up to 50% compared with other hot tubs. Brilliantly, the air between the fiberglass lining and the wood exterior is super-heated to accelerate the heating process. The stove is cleverly engineered to draw cooler water through a lower channel and redistribute it though an upper channel to equalize the temperature. This incredibly efficient wood stove will heat 304 gallons of water from 40 degrees F (5 degrees C) to 95 degrees F (35 degrees C) in 1.5 to 2 hours - the fastest-heating wood-burning hot tub available. Relax with friends and family the luxury of your Model S4 backyard wood-burning hot tub from SaunaLife. Model S4N Outdoor Wood-Burning Hot Tub 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) 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) Model S4N Outdoor Wood-Burning Hot Tub Polished stainless steel chimney