Finnish Contraflow Masonry Heater
Finnish contra flow has two dawn draft channels and mass that can be up to 2 metres high. Heater can be fitted with an oven or other features like a heated bench. High quality cast iron doors are used. Weight over 3 ton is not unusual, depending on the type of brick used. Heaters can be finished with lime or clay plaster, brick or natural stone or even tiled and painted.
For more information and drawings see Masonry Heater Portfolio in Downloads section.