Heat storage-sauna

The smoke-sauna stove is also used with a sealed stone compartment and chimney (a heat storage-stove) which eliminates the smoke odor and eye irritation of the smoke sauna. A heat storage stove does not give up much heat in the sauna before bathing since the stone compartment has an insulated lid. When the sauna bath starts and the shutter opens, warmth flows into relatively cold (60 °C [140 °F]) sauna. This heat is soft and clean because, thanks to combustion, the stove stones glow red, even white-hot, and are freed of dust at the same time. When bathing the heat-storage, the sauna will become as hot as a continuous fire type-sauna (80–110 °C [176-212 °F]) but more humid. The stones are usually durable heat proof and heat-retaining peridotite (a type of stone). The upper part of the stove is often insulated with rock wool and firebricks. Heat-storing stoves are also found with electric heating, with similar service but no need to maintain a fire.