The Golden Fire

NunnaUuni fireplaces release even heat – cleanly. Thanks to NunnaUuni's unique method of burning wood, the absence of the harmful soot makes the air clear. The method of clean burning we have developed is called the Golden Fire.

This air guiding system patented by NunnaUuni burns the wood in the fireplace in an incredibly hot fire. The high and even heat – with a burning temperature of up to 1,200°C – eliminates the creation of harmful gases. No material remains unburnt, and the chimney doesn't pour out sooty smoke. Therefore, heat-insulating soot doesn't decrease the heat-storing capacity of the fireplace, either, since it doesn't accumulate on the interior walls of the fireplace. 

The Golden Fire wood-burning technique has ensured the clean burning of wood in NunnaUuni Oy’s fireplaces since 2000. The technique was invented in 1998, and it has been granted a European patent (EP 1008808).

The Golden Fire – a new gasification burning method for wood

1. The primary air is led under the wood, through the small holes in the grate, to maintain the gasification burning. This burning, which remains nearly constant, gasifies the wood evenly so that it is not over-gasified.

2. The secondary air is also led under the grate to around the gasification burning, where the air is preheated. The preheated air mixes with the wood gases above the wood, raising the burning temperature of the gases to a steady level (800–1,200ºC). The high and even burning temperature guarantees efficiency in both heat production and the cleanness of the combustion gases.

3. While under the grate, the primary and secondary air flow also cool the grate structures.

Your nose tells you the same thing research has proven

In NunnaUuni fireplaces, the burning is clean, thanks to the unique burning method. When the emissions are minimal, the use of ecological fuel doesn't reduce the air quality. This makes life easier for many asthmatic or allergic people. NunnaUuni fireplaces also consume wood sparingly. They utilise its energy carefully, thus conserving both firewood and nature.