Polyethylene is a durable and heat-resistant plastic that is used for everything from plastic bags to large plastic containers. Also suitable as a material for making hot tubs from. It is available as solid color or a "marbled" pattern.

FINNTub is our plastic hot tub with an efficient, external (25 kW) wood-burning stove. The wood stove is made of stainless steel double-sheathed marine aluminum which quickly reaches the right working temperature, which is important to minimize coatings on the stove's interior walls. It is also important with regard to the development of smoke and efficient combustion for a cleaner environment. Because the stove is located on the outside, it also does not take up space inside the hot tub, which can then be used entirely for the purpose for which it is intended.