With the start of each heating season, the public and the media in Bulgaria pay close attention to the problems of atmospheric air pollution and sources of dust and fine particulate emissions. A large part of the population in cities, mountainous and semi-mountainous regions of the country massively uses for heating damp firewood and high-sulfur coal, burned in low-efficiency stoves, fireplaces and solid fuel boilers. The lack of automated household heat sources to regulate and manage fuel supply in the form of wood biomass and the combustion process leads to fuel surplus and environmental pollution. The use of automated fuel heaters in the form of wood pellets with an efficiency> 85% would generate twice as much energy for heating, and dust emissions and PM10 and PM2.5 would be drastically reduced.
Ekoterm Proekt EAD is a company that develops and offers comprehensive solutions for reducing emissions generated from domestic heating in the ambient air by using clean and efficient heating technologies. The water heaters Viadrus U22 Bisolid, Bisolid New K and Bisolid New N, supplied by Ekoterm Proekt, have been certified by TÜV NORD for compliance with BDS EN 303-5: 2012.
TÜV NORD product certification of boilers in pellet burning mode using pelletized pellet burner GP xx R tsc demonstrated full compliance with:
- Requirements, methods and processes of production;
- Quality management system;
- Safety test;
- Quality of the combustion process;
- Work and emission characteristics;
- Marking and maintenance of heating boilers.
The test tests of Viadrus U22 Bisolid, Bisolid New K and Bisolid New N with the innovative pellet burner GP xx R tsc with rotary cleaning showed that the boilers are classified as class 5 boilers according to BDS EN 303-5: 2012 . Measured emissions of CO, organic carbon (OGC) and dust released into the atmospheric air at rated thermal input and minimum continuous thermal power fall within the norms defined in the standard.
Viadrus U22 Bisolid heating boilers are designed for burning solid fuels (coal, bitumen, wood) and serve for heating of small and medium objects, with a maximum working pressure of up to 0.4 MPa. The possibility of switching to wood pellet heating by means of a suitable conversion kit creates a fully automated system that provides maximum comfort when heating one- or two-storey single-family houses and reduces harmful emissions in the ambient air.
The kit for conversion of the boiler contains the following components:
Tube pellet burner, complete with fuel auger; / Factory-cut door, with Viadrus boiler flange for pellet burner; The respective number makes cast-iron slabs; One curved cast iron plate; / Safety thermostat, manual reset, 100 oC; Contact thermostat 30 – 90 oC.
Bisolid New K boilers are designed as cast-iron three-way boilers suitable for burning solid fuels (wood and coal). The boilers are designed to heat buildings with thermal losses from 14kW to 70kW, depending on fuel characteristics and number of sections. By means of easy dismantling of the bottom of the boiler flange and installation of a pellet pellet burner with a suitable conversion kit, Bisolid New K boilers can provide thermal comfort to consumers through highly efficient combustion of wood pellets, such as CO2 emissions, organic bound carbon and dust are drastically reduced.
Bisolid New N Steel Heaters are heat sources suitable for heating homes, single-family and multifamily houses, public buildings and premises, production workshops and other similar sites with thermal losses in the range of 20-80 kW. Consumers can provide thermal comfort through highly efficient combustion of wood pellets. The pellet pellet burner GP xx R tsc can be easily installed on the lower door of the boiler by means of a universal conversion and isolation. Thus, based on the automated burning of clean fuel such as wood pellets, greenhouse gas emissions are reduced.
According to the company policy of Ekoterm Proekt, all refurbishment of solid fuel boilers and setting of automatic wood pellet burning modes are performed only by authorized and trained installers and service specialists. The certification of heating boilers Viadrus U22 Bisolid, Bisolid New K and Bisolid New N will enable consumers to use their heat sources in environmentally friendly fuel pellets. This is a very suitable and highly efficient solution for the domestic consumers, which will ensure the use of affordable fuel – wood pellets and will reduce the emissions of dust, PM10 and PM2.5 released into the ambient air.

Due to the long experience of the experts and engineers from the research and development of the company in the field of utilization of wood biomass and its own know-how, Ekoterm Proekt has the opportunity to offer on the Bulgarian and European market quality and ecological products with trade mark Bisolid with the the best price-quality ratio.
The proposed heating boilers from Ekoterm Proekt, certified in class 5, according to the high requirements of BDS EN 303-5: 2012, will help to support the efforts of the Republic of Bulgaria in achieving the goals related to the reduction of the emissions of harmful substances released into the air , in the context of the European Union’s policy package.
Ekoterm Proekt is a dynamically developing company with a clear mission and business strategy and a long-term commitment to its customers. Following its long-term business ideology, the management of Ekoterm Proekt is convinced that the proposed Bisolid heating equipments will satisfy the most stringent requirements of the market users.
More information about Ekoterm Proekt and the range of products, systems and solutions available can be obtained from the distribution network throughout the country or on the company’s Facebook page.
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