Operating principle

First round trip - radiation heat exchange

Gas is fully burned in the corrugated furnace chamber, producing high-temperature flames and flue gas. The furnace chamber is surrounded by water, and the high-temperature flue gas transfers most of the heat to the furnace water through radiative heat transfer.

Second round trip - convective heat transfer

After leaving the furnace, high-temperature flue gas does not enter the third group of flue pipes, but directly enters the large capacity convection flue located in the front or side. Dense heat exchange tubes are arranged inside the flue, and the flue gas undergoes strong convective heat transfer.

Core condensation stage - latent heat recovery

The flue gas that has completed convective heat transfer enters the high-efficiency condensing heat exchanger. The water vapor condenses into water, releasing a large amount of latent heat of vaporization and being recovered. The condensed water is discharged, and the low-temperature flue gas is ultimately drawn out by the induced draft fan.

Low nitrogen combustion throughout the entire process

Starting from ignition, ensure that the combustion temperature is gentle and suppress the generation of nitrogen oxides from the source.

Features and advantages

Simplify the structure and optimize the process
More compact structure, smaller volume, lighter weight, and lower smoke resistance
Focusing on efficient condensation and excellent low load performance
Deep energy-saving potential, quickly achieving optimal efficiency
Retaining all advanced features of modern high-end boilers
Fully automatic intelligent control, multiple safety protections, low nitrogen emissions (NOx<30mg/m ³)

Model	Rated evaporation rate(t/h)	Rated Working Pressure (MPa)	Saturated Steam Temperature (℃)	Thermal Efficiency (%)	Natural gas consumption(m³)	Shipping Weight(t)
NWNS1-1.0-Q	1	1.0/1.25/1.6	184/194/204	103.2	76.2	5.7
NWNS1.5-1.0-Q	1.5	1.0/1.25/1.6	184/194/204	103.2	114.6	6.5
NWNS2-1.0-Q	2	1.0/1.25/1.6	184/194/204	103.1	152.8	8.3
NWNS3-1.25-Q	3	1.0/1.25/1.6	184/194/204	103.2	229.2	9.1
NWNS4-1.25-Q	4	1.0/1.25/1.6	184/194/204	103.2	305.3	12.1
NWNS6-1.25-Q	6	1.0/1.25/1.6	184/194/204	103.2	458.2	15.2
NWNS8-1.25-Q	8	1.0/1.25/1.6	184/194/204	103.2	611	18.6
NWNS10-1.25-Q	10	1.0/1.25/1.6	184/194/204	101.4	762.4	21.3
NWNS15-1.25-Q	15	1.0/1.25/1.6	184/194/204	101.2	1145.5	32.5
NWNS20-1.25-Q	20	1.0/1.25/1.6	184/194/204	101.3	1527.3	38.6

(*For reference only)

Laundry rooms, central kitchens, heated swimming pools, and district heating in large hotels, hospitals, schools, and commercial complexes
Steaming, sterilization, disinfection, and cleaning processes for central kitchens, bread baking factories, dairy factories, and breweries in chain restaurants
Process heating, humidification, and heating in electronic equipment factories, clothing factories, precision instrument workshops, and small industrial parks
Old, inefficient, and substandard coal-fired or ordinary gas boilers need to be replaced, but the original boiler room foundation, space, or lifting channels are limitd

Two way condensing boiler	Three way (WNS) condensing boiler
Simplicity, short flue gas flow, and more concentrated design of convection and condensation sections.	Classic, long flue gas process, furnace radiation+second/third return convection+tail condensation
More compact and lightweight	Relatively larger and heavier.
Especially suitable for projects with limited space and large load changes.	The widest applicability, most mature technology, and fully validated in the market.