hormiHormiProffa Oy has several decades’ experience of heat recovery from the flue. The company has supplied Energy Chimneys already for hundreds of residential buildings in Finland. The patented HormiProffa Energy Chimney has been subjected to several tests; e.g. pressure and fire safety tests as well as heat recovery tests. HormiProffa Energy Chimney is also one of the most fire safe chimneys available on the market.

As a result of a long product development, the Energy Chimney has achieved its current design and structure. The chimney whole, including the heat recovery unit, is manufactured in a modern factory meeting international criteria. Each heat recovery unit is also tested prior to the delivery. We grant a 10 years’ warranty for the HormiProffa Energy Chimney!

HormiProffa Energy Chimney increases significantly the amount of heat energy recovered from wood, because this heat energy would otherwise be completely lost.

HormiProffa Energy Chimney is an ecological solution, because it saves wood to be burnt, and this way also the environment. Besides this, the other heating characteristics of the fireplace remain unaltered. The Energy Chimney can be combined conveniently to the other heating system used in a residential building.
illusttration of chimney system
With regard to its outward appearance, HormiProffa Energy Chimney does not differ from a regular chimney,
and it is available for various fireplaces such as for ovens, fireplaces, iron stoves or sauna ovens. HormiProffa Energy Chimney can be also installed to a water circulating fireplace – this means that for example the heat energy obtained from a charging water circulating fireplace into water generally approximately doubles. This means that it is easy to install the HormiProffa chimney whole to all fireplaces.

HormiProffa Energy Chimney has been integrated into the steel flue delivered by HormiProffa, forming a heat recovery phase. At the lower end of the recovery phase, there are connection assemblies from where the recovery is connected to a hybrid charger. The recovery phase is always installed as a part of the steel flue whole supplied by HormiProffa.
A heat exchanger has been built ingeniously around the flue, and this way the flue wall functions as a heat exchange surface from the smoke to the water
. Thanks to the patented structure, the water circulation in the flue is optimal with regard to both heat exchange and heat insulation. When a fire is lit in a fireplace, flue gases heat the heat exchanger placed around the flue pipe, and the control unit starts the heat exchange from the flue to the hybrid charger. After the fire has gone out, the temperatures in the flue and in the charger settle on the same level, and the control unit stops the circulation.


  • temperature class: T600
  • flue diameter: 150 or 200 mm
  • max. outside diameter of the flue: 330 mm (200 mm chimney)
  • materials: flue of stainless steel, fire insulation of mineral wool and outer casing of galvanized steel plate (brushed RST casing available for extra charge)
  • connection to a fireplace: from above or from the side. At the maximum two fireplaces using the same fuel, located on the same floor, can be connected to the chimney, when the chimney is dimensioned for the simultaneous use of both fireplaces, and both fireplaces have been equipped with separate dampers. The dampers will have to be ordered from the fireplace supplier.
  • length: 2 m
  • dimensions: integrated into the steel flue phase
  • material: stainless steel/acid-proof steel
  • recovery capacity: approx. 60 – 70 % of the thermal capacity of flue gases (depending on the fireplace and the time of burning, the average capacity 10 – 20 kW)
  • heat connections: all connections at the lower end of the recovery phase (SK 1/2″)
  • venting assembly: at the lower edge of the phase (SK 1/8″)
  • sensor pocket: at the lower edge of the phase (for a 6 mm sensor)
  • sensor cable: 2-fold weak current cable e.g. KLMA 2×0.75 mm²


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