Continuous fire sauna

A continuous fire stove, instead of stored heat, is a relatively recent invention. There is a firebox, a smokestack and stones placed in a compartment directly above the firebox. It takes one hour, to heat up the sauna, which is less time-consuming than the heat storage-sauna. A fire-heated sauna requires manual labor in the form of maintaining the fire during bathing; the fire can also be seen as a hazard.
Fire-heated saunas are common in cottages, where the extra work of maintaining the fire is not a problem.