At present, centralized heating is the preferred method of heating in most cities and regions. Compared with decentralized heating, it is more convenient and better controlled. The hot water boiler is the main heat energy equipment for central heating. Zhengzhou Fangkui Boiler Factory will come to briefly talk about this type of hot water boiler.
In central heating, if a gas-fired hot water boiler is used, how to select and quote?
In central heating, if a gas-fired hot water boiler is used, the type selection mainly depends on the heating area, and the specific type and specifications of the boiler are determined by the size of the heating area, so that the wrong selection can also be avoided. The quotation of this type of boiler is based on the tonnage of the boiler.
What is the 5 tons of 5 tons hot water boiler? And can the sewage outlet on the hot water boiler be omitted?
For a 5 ton hot water boiler, 5 ton refers to the thermal power of the boiler. If converted, it is equivalent to 3.5 MW. The sewage outlet on the hot water boiler must be connected, and there must be no omissions. Moreover, the location of the sewage is also different and cannot be treated uniformly.
The boiler model, which is expressed as WNS4.2-1.0/115/70-Q, what does it say?
If the boiler model is expressed as WNS4.2-1.0/115/70-Q, it means that this is a horizontal hot water boiler, because W refers to horizontal, N refers to internal combustion, and S refers to the room Burning. In addition, it can also be known that the heating capacity of the boiler is 4.2MW per hour, which is equivalent to 6 tons, and its rated pressure is 1MPa. In addition, the outlet and return water temperatures are 115°C and 70°C, respectively. Fuel is natural gas, liquefied gas, city gas and other gas fuels.
We, Zhengzhou Fangkuai Boiler Co., Ltd. (Fangkuai), are excited to announce our participation in the Indonesia International Heating Technology Exhibition 2025. We will be showcasing our advanced boiler systems engineered for higher efficiency, lower emissions, and sustainable energy performance. Join us at Booth No. B1-08 from November 5–7, 2025 at the Jakarta Convention Center.
The event brings together EXPO BOILER, EXPO BIOMASS, EXPO PUMPS & VALVES, and EXPO CRANE — creating a comprehensive platform for technology exchange and business collaboration across the industrial heating and energy sectors in Southeast Asia.
At the exhibition, we will present our integrated solutions including biomass boilers, industrial steam systems, and full power plant EPC services. Our products emphasize:
Event Details
Date: November 5–7, 2025
Venue: Jakarta Convention Center, Indonesia
Booth: B1-08
We welcome industry partners, plant owners, EPC clients, and technology scouts to visit our booth and explore collaboration opportunities. Whether you are planning a biomass retrofit, a new power plant EPC project, or seeking high-efficiency boiler equipment, our engineers will be available for technical discussions and project consultations.
Visit our booth / Contact us












Wins Another Invention Patent
Brilliant Glory, Continuing to Write a Brilliant Chapter
Striving for "Innovation" and "Quality"
Focusing on Cutting-Edge Technologies
Creating New Momentum and New Advantages
Promoting the Continuous "Innovation" of New-Quality Productivity
On June 17th, our company was awarded another national invention patent. To date, the company has secured 162 national patents and 13 invention patents, and has been deeply involved in the formulation of eight national and industry standards. We continue to lead industry development with technological breakthroughs.

Overcoming challenges and achieving remarkable results
Attaching great importance to technological innovation
While pursuing superior quality, Fangkuai also attaches great importance to technological innovation.
Developing product diversity
To better meet the diverse needs of consumers, Fangkuai develops diverse product images during R&D and production.
Fangkuai family portrait

Gloriously writing a new journey
The company has always adhered to the philosophy of
"Building Character, Creating Quality Products"
Using technological R&D as the core driving force
Also promoting application
Effectively promoting technological advancement in the industry and engineering products
Future

Continued
Scientific and technological R&D and technological achievement transformation
Generate more core independent intellectual property rights
Solidly promote the company's high-quality development