Press release #Bosch Home Comfort Group

More than 100 Bosch boilers for clean air in Beijing

Below the limit value: 22 mg/m³ NOx emissions

Annemarie Wittmann


For replacing existing heating boilers in Beijing, Bosch Thermotechnology received three large orders for the delivery of 138 Uni Condens 6000 F heating boiler systems in total. Clean and energy-efficient heating technology in China's metropolises is now more important than ever. Particularly stringent emission standards have been introduced in order to reduce pollutant emissions. In Beijing the nitric oxide limit value for heat generation systems and power plants is just 30 milligramme per cubic metre. With 22 milligramme per cubic metre the optimised and natural gas-fired Uni Condens 6000 F heating systems produce even lower emissions than the stipulated limit values, and use condensing technology to offer maximum efficiency.

Beijing Huaying Tianrun Energy Technology Co. Ltd. operates several heating plants in Beijing and approached Bosch Thermotechnology for the first time in 2016. The objective was to use new heating systems to significantly reduce nitric oxide emissions and improve energy efficiency. Special factors had to be taken into account during the early technical design phase, above all the high levels of air pollution in Beijing. Not all burner technologies are capable of reliably reducing nitric oxide emissions. Bosch Thermotechnology worked with a reputable burner manufacturer to develop an innovative solution. In addition to an optimised combustion chamber and modified control system, the Uni Condens 6000 F boilers also use the recirculation technology, which is commonly used for industrial boilers. They are characterised by their robust design, are resistant to contamination and guarantee extremely low nitric oxide values in the exhaust gas with a relatively low excess oxygen level of less than 3.5 per cent: Depending on the set burner output, nitric oxide emissions are between 22 and 29 milligramme per cubic metre – and therefore below the limit value for Beijing of 30 milligramme per cubic metre.

The 1.2 megawatt Uni Condens boilers also use sophisticated condensing technology, which further reduces the amount of energy used as well as nitric oxide emissions. In comparison to their predecessors, the boilers use up to 15 per cent less fuel. The low nitric oxide values and excellent efficiency were also confirmed in March 2018 by the “China Special Equipment Inspection and Research Institute (CSEI)”, who carried out measurements on site. With its further-developed boilers, Bosch Thermotechnology successfully implemented a solution for a special market requirement in just a few months. Since the delivery of the first 20 boilers in 2016, Beijing Huaying Tianrun Energy Technology Co. Ltd. commissioned a further 118 low-emission Uni Condens 6000 F boilers in 2017 and 2018. They are all contributing to reducing climate-damaging greenhouse gases – for better air quality in Beijing.

Contact person for press inquiries:
Annemarie Wittmann
+49 9831 56-218

Bosch Thermotechnology is a leading European manufacturer of energy-efficient heating products and hot water solutions. In fiscal 2017, the company generated sales of about 3.4 billion euros (67 percent outside Germany) and employed approx. 14 400 people. Bosch Thermo¬technology has strong international and regional brands and manufactures a diversified product range in Europe, America and Asia.

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The Bosch Group is a leading global supplier of technology and services. It employs roughly 429,000 associates worldwide (as of December 31, 2023). The company generated sales of 91.6 billion euros in 2023. Its operations are divided into four business sectors: Mobility, Industrial Technology, Consumer Goods, and Energy and Building Technology. With its business activities, the company aims to use technology to help shape universal trends such as automation, electrification, digitalization, connectivity, and an orientation to sustainability. In this context, Bosch’s broad diversification across regions and industries strengthens its innovativeness and robustness. Bosch uses its proven expertise in sensor technology, software, and services to offer customers cross-domain solutions from a single source. It also applies its expertise in connectivity and artificial intelligence in order to develop and manufacture user-friendly, sustainable products. With technology that is “Invented for life,” Bosch wants to help improve quality of life and conserve natural resources. The Bosch Group comprises Robert Bosch GmbH and its roughly 470 subsidiary and regional companies in over 60 countries. Including sales and service partners, Bosch’s global manufacturing, engineering, and sales network covers nearly every country in the world. Bosch’s innovative strength is key to the company’s further development. At 136 locations across the globe, Bosch employs some 90,000 associates in research and development, of which nearly 48,000 are software engineers.

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