Golden Fire burns wood cleanly and efficiently

Users of the NunnaUuni have no need to worry about emissions. Our heat-storing fireplaces are designed to fulfil standards set for urban environments. Choose the NunnaUuni, a sustainable choice for the environment. You can enjoy the cosy atmosphere of a real fire every day.

NunnaUuni’s Golden Fire was developed to burn wood cleanly at a high energy level of around 20-30 kW. This means that a large amount of heat is generated in a short period of 2-3 hours, with the minimum of emissions. Mammutti type of soapstone, which conducts heat rapidly, enables the storage of large amounts of energy, and a pleasant energy release (maximum 2-3kW) through the heat storage structure for up to 48 hours.

NunnaUuni’s Golden Fire burning method generates an extremely high heat level, in which wood burns evenly and well. The clean burning of the NunnaUuni fireplace is based on precise airflow management, which provides just the right amount of air for combustion at different stages. Combined with Mammutti soapstone, the Golden Fire method makes NunnaUuni fireplaces energy efficient without harmful emissions.

The Golden Fire gasification burning method

The Golden Fire burning method developed and patented by NunnaUuni is based on the precise direction of air, which ensures that exactly the right amount of air is used in the different phases of burning. This is possible, because the grate we use in our fireplaces is specially constructed with holes and equipped with a controller that ensures that the amount of oxygen remains exactly right during the different phases of heating, from lighting the fire down to the embers.

  1. The Golden Fire gasification burning methodCombustion air is conducted into the space under the Golden Fire grate, either from the surrounding room or straight from outside the house. When conducted in from under the grate, the air cools the grate down and simultaneously preheats.
  2. A small portion of the combustion air is conducted under the embers through holes found in the Golden Fire grate to ensure that the gasification burning process continues smoothly and evenly.
  3. Most of the preheated combustion air is conducted from the sides of the Golden Fire grate to the space around and above the logs where it serves as secondary air and ensures that the gases released evenly from the said logs burn at a high temperature of 800–1 200°C.

Genuine NunnaUuni fireplaces, tested in accordance with heat storing fireplace test method, are built to adhere the emission limits of the future EU EcoDesign standards. In this strictest test method only for heat storing fireplaces the smoke gases are measured during the entire burning phase, starting from the moment the fire is lit.

European Standards for measuring the emissions of space heaters

Harmonised European standards categorise biomass room heating appliances based on various technologies. This generally includes room heaters (wood burning stoves), insets or slow heat release fireplaces.

The official test methods for room heaters (EN 13240) and insets appliances (EN 13229) only measure emissions at nominal load and after the operating temperature has been reached. The ignition of the first batch of wood and the heating-up of the stove are not factored in to the emission results.

In the European test method for slow heat release fireplaces (EN 15250), emissions are measured upon ignition and heating-up of the fireplace in accordance with manufacturer instructions regarding the complete combustion of the amount of wood specified. All exhaust emissions during the burning are included in the test results.