LOW-NOx CONDENSING GAS BOILER
YDLB Fully Premixed Condensing Gas Boiler
A commercial fully premixed condensing gas-boiler family covering 1,400–4,200 kW with low-NOx combustion and high return-water heat recovery.
- Rated Output
- 1,400–4,200 kW
- Maximum Outlet
- 90°C
- Listed NOx
- <30 mg/m³
- Turndown
- 15–100%
PRODUCT OVERVIEW
Four Commercial Condensing Models for Large Heating Circuits.
YDLB uses fully premixed combustion, variable-frequency modulation and condensing heat recovery in a compact commercial package. The listed range includes 1,400, 2,100, 2,800 and 4,200 kW models.
Condensing performance depends on return-water temperature, load, gas quality, combustion setup and the agreed test boundary. The complete circuit must manage flow, pressure, condensate and water quality.
WORKING PRINCIPLE
Premixed Combustion and Low Return Temperature Recover More Heat.
Gas and combustion air are mixed and modulated before entering the burner. Heat transfers to the circulating water through the main exchanger.
When return-water temperature is low enough, water vapor in the flue gas condenses and releases additional heat. Condensate drainage, corrosion-resistant materials and correct hydraulic design are therefore essential.
TECHNICAL DATA
Verified Listed Models and Operating Data.
The table keeps model identities and values separate. Final dimensions, interfaces, components and site performance follow the approved technical proposal and drawings.
| Model | Rated Output | Max Gas Use | Hot-Water Supply Δt=20°C | Max Water Flow | System Pressure | Efficiency 80/60°C | Efficiency 50/30°C |
|---|---|---|---|---|---|---|---|
| YD-LB1400 | 1,400 kW | 140 m³/h | 60 m³/h | 120 m³/h | 0.2–6 bar | 98% | 103% |
| YD-LB2100 | 2,100 kW | 210 m³/h | 90 m³/h | 180 m³/h | 0.2–6 bar | 98% | 103% |
| YD-LB2800 | 2,800 kW | 280 m³/h | 120 m³/h | 240 m³/h | 0.2–6 bar | 98% | 103% |
| YD-LB4200 | 4,200 kW | 420 m³/h | 180 m³/h | 360 m³/h | 0.2–6 bar | 98% | 103% |
Selection: Confirm the real heat or steam load, operating profile, utility conditions and destination requirements before selecting a model.
Performance: Actual consumption and efficiency depend on delivered energy quality, load, temperatures, tuning, system losses, maintenance and the agreed test boundary.
PROJECT ENGINEERING
Return Temperature, Gas Supply and Hydraulics Control Real Performance.
A reliable proposal starts with measured or calculated project data rather than only a nominal model name.
Send project data- 01Heat Load
Provide design, normal and minimum load.
- 02Water Temperatures
Confirm supply/return targets and condensing operating time.
- 03System Flow
Provide circuit pressure, flow, zoning and pump arrangement.
- 04Gas Supply
Confirm composition, dynamic pressure and available maximum flow.
- 05Condensate
Define neutralization, drainage and freeze protection.
- 06Emissions
Confirm local NOx, CO, chimney and commissioning requirements.
SYSTEM ROUTE
Coordinate the Equipment, Utilities, Controls and User Load.
The primary equipment is one part of a complete system. Final pipe sizes, pump duties, valves, instruments and site interfaces follow the approved design.
PROJECT SCOPE
Define Every Included Item and Site Responsibility.
The formal proposal identifies the exact model, controls, auxiliaries, instruments, documentation and customer interfaces. Items are included only when stated in the agreed scope.
Civil works, site piping, electrical cabling, utility connections, installation, destination approvals, registration, inspection and testing are included only when explicitly stated.
APPLICATIONS
Match the Equipment to the Real Process and Operating Pattern.
Final suitability depends on load, temperatures or pressure, operating hours, utilities, water quality, emissions and destination requirements.
District Heating
Commercial and institutional heating networks.
Hotels & Resorts
Space heating and indirect domestic-hot-water preparation.
Hospitals
Zoned heating systems with appropriate redundancy.
Schools & Campuses
Multiple-building and seasonal heating duties.
Industrial Buildings
Large workshops and process-support hot water.
Public Facilities
Stadiums, transport hubs and municipal buildings.
FREQUENTLY ASKED QUESTIONS
YDLB Fully Premixed Condensing Gas Boiler FAQ.
Why can condensing efficiency exceed 100%?
Values above 100% use a lower-heating-value basis and include latent heat recovered from flue-gas condensation.
What return temperature supports condensation?
Lower return temperature increases condensation potential; the actual result depends on load, flow and system design.
Is the listed NOx value guaranteed everywhere?
It is a listed value under stated operating conditions. Final compliance follows gas quality, commissioning, altitude, chimney design and the agreed test method.
Can YDLB produce domestic hot water directly?
Use an approved indirect heat exchanger or storage-water system selected for hygienic and pressure requirements.
What gas pressure is listed?
The listed dynamic gas-supply range is 5–8 kPa. Final gas train and regulator design must be confirmed.
What data is needed for selection?
Send heat load, temperatures, flow, system pressure, gas data, emissions target, power supply, altitude and destination.
TECHNICAL SELECTION
Send the Load, Utilities, Operating Conditions and Destination.
JINHONG will match the model, auxiliaries, controls and system boundary to the actual project data.