Gas Boiler Classification Guide: Four Dimensions for Accurate Selection

Gas boilers are the core of modern heating systems, offering diverse types and functions. Scientific classification not only helps users choose the right model but also maximizes system efficiency. This guide analyzes gas boiler classifications from four key perspectives.

1. Classification by Structural Design

This is the most common method. Boilers are categorized into horizontal and vertical types. Horizontal boilers feature larger capacity and higher efficiency, making them ideal for industrial and commercial applications. Vertical boilers save floor space and are suitable for residential projects with limited room.

Based on combustion design, boilers can also be divided into atmospheric pressure and pressurized types. Atmospheric boilers offer higher safety and do not require inspection and approval, while pressurized models handle greater demands.

2. Classification by Function and Application

Heating Boilers: Designed for space heating, featuring simple structure and lower cost.
Hot Water Boilers: Provide domestic hot water with precise temperature control.
Steam Boilers: Used in industrial applications with working pressures exceeding 10 MPa.
Combined Heat and Power (CHP) Boilers: Enable energy cascade utilization with overall efficiency above 90%.

3. Classification by Technology Level

Standard Boilers: Thermal efficiency ranges from 85% to 90%.
Condensing Boilers: Utilize low-temperature flue gas condensation technology for 102%–108% efficiency.
Low-NOx Boilers: Apply FGR or full premix technology, keeping NOx emissions below 30 mg/m³ to meet strict environmental regulations.

4. Classification by Capacity and Pressure

Small Boilers: Less than 1 t/h, suitable for residential use.
Medium Boilers: 1–20 t/h, ideal for commercial facilities.
Large Boilers: Over 20 t/h, commonly used in industrial sectors.

Pressure levels include low pressure (<1.6 MPa), medium pressure (1.6–10 MPa), and high pressure (>10 MPa) boilers.

Conclusion

Selecting the right gas boiler requires careful consideration of application scenarios, energy costs, and environmental standards. For expert guidance, the technical team at Jiangsu Quanxin Boiler Co., Ltd. is always ready to provide professional consultation.