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Hot water boiler

A hot-water boiler is a thermal‑power device that uses the heat released by fuel combustion to raise ordinary ambient‑temperature water to a specified temperature, providing heat for space heating, domestic hot water, or industrial processes. Its defining feature is that the water inside the boiler is heated and its temperature raised without undergoing a phase change to produce steam; the output is a hot‑water medium at a specific temperature and pressure.

Our company primarily manufactures WNS low-NOx gas (or oil)-fired hot-water boilers and vacuum hot-water boilers.

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Product Overview

A hot-water boiler is a thermal‑power device that uses the heat released by fuel combustion to raise ordinary ambient‑temperature water to a specified temperature, providing heat for space heating, domestic hot water, or industrial processes. Its defining feature is that the water inside the boiler is heated but does not undergo a phase change to produce steam; instead, it delivers a hot‑water medium at a controlled temperature and pressure.

Our company primarily manufactures WNS low-NOx gas (oil)-fired hot-water boilers and vacuum hot-water boilers.

1. WNS Low-Nitrogen Gas (Oil)-Fired Hot Water Boiler

(1) Schematic Diagram of the External Dimensions of the WNS Low-Nitrogen Hot-Water Boiler

(2) WNS Low-Nitrogen Gas-Fired Hot Water Boiler Parameter Table

Parameter Category\Boiler Model		WNS0.7-1.0/95/70-Q	WNS1.4-1.0/95/70-Q	WNS2.1-1.0/95/70-Q	WNS2.8-1.0/95/70-Q	WNS3.5-1.0/95/70-Q	WNS4.2-1.0/95/70-Q	WNS5.6-1.0/95/70-Q	WNS7-1.0/95/70-Q	WNS10.5-1.25/115/70-QWNS10.5-1.25/130/70-Q	WNS14-1.25/115/70-QWNS14-1.25/130/70-Q
Rated thermal power (MW)		0.7	1.4	2.1	2.8	3.5	4.2	5.6	7	10.5	14
Rated working pressure (MPa)		1	1	1	1	1	1	1	1	1.25	1.25
Rated outlet water temperature (°C)		95	95	95	95	95	95	95	95	115/130	115/130
Rated Return Water Temperature (°C)		70	70	70	70	70	70	70	70	70	70
Full water capacity (m³)		2	2.8	4.1	5.9	6.1	8	10.9	12.6	18.7	25.1
Design thermal efficiency (%)		≥95	≥95	≥95	≥95	≥96	≥96	≥96	≥96	≥96	≥96
Flue gas temperature (°C)		≤100	≤100	≤100	≤100	≤100	≤100	≤100	≤100	≤100	≤100
Design fuel		Natural gas, town gas, coal gas, coke oven gas, No. 0 light diesel oil, etc.
Maximum transport weight (t)		3.2	4.3	5.3	8.2	9	11.3	13.9	16.5	25.2	34.9
Overall dimensions – L1 × W1 × H1 (mm)		3805×1400×1730	4100×1600×1930	4705×1800×2130	5200×2050×2385	5305×2100×2440	5735×2300×2640	6315×2505×2840	7025×2605×2940	7835×2960×3285	8265×3265×3585
Overall dimensions after installation – L2 × W2 × H2 (mm)		5240×1400×2600	6030×1600×2800	6800×1800×3120	7190×2300×3550	7325×2245×3605	7750×2505×3830	8420×2705×4010	9145×2755×4010	9995×3110×4450	10900×3415×4760
Interface diameter (mm)	Drain valve	DN80	DN100	DN125	DN150	DN200	DN200	DN200	DN200	DN250	DN250
	Return valve	DN80	DN100	DN125	DN150	DN200	DN200	DN200	DN200	DN250	DN250
	Safety valve	DN40	DN50	DN80	2×DN50	DN80, DN50	DN80, DN50	2×DN80	2×DN80	2×DN100	DN150+DN50/2×DN100
	Drain valve	DN50	DN50	DN50	DN50	DN50	DN50	DN50	DN50	DN50	DN50

(3) Example images of installations at the production site

2. Vacuum Hot-Water Boiler

A vacuum hot-water boiler is a high-efficiency hot-water boiler that creates a negative-pressure vacuum within its sealed furnace and uses the principle of phase-change heat transfer to heat circulating water. Its operating principle involves injecting a small amount of heat-transfer fluid into the furnace; under vacuum, this fluid boils at a low temperature, generating steam. The steam then contacts condensing heat-exchange tubes, where it condenses and releases heat to warm the circulating water inside the tubes. The condensed heat-transfer fluid returns to the furnace to be reheated, and the cycle repeats continuously, ensuring the hot water in the furnace’s coil is steadily heated. Conventional vacuum hot-water boilers achieve an efficiency of ≥94%; with the addition of a condenser, efficiency can reach 96%–102%.

(1) Schematic diagram of the external dimensions of a vacuum hot-water boiler

(2) Parameter Table for Vacuum Hot-Water Boilers

ZKL0.350–ZKL7.000 (94% standard type)

Parameter\Model		Unit	ZKL0.350	ZKL0.465	ZKL0.580	ZKL0.700	ZKL0.930	ZKL1.160	ZKL1.400	ZKL1.510	ZKL1.860	ZKL2.100	ZKL2.300	ZKL2.800	ZKL5.600	ZKL7.000
Rated heating capacity		10⁴ kcal/h	30	40	50	60	80	100	120	130	160	180	200	240	480	600
Rated heating capacity		kW	350	465	580	700	930	1160	1400	1510	1860	2100	2300	2800	5600	7000
Heat exchanger	△t=10	°C	60/50
	△t=20	°C	80/60
	△t=25	°C	75/50
	△t=40	°C	60/20
Applicable Fuel			Natural gas
Fuel consumption		Nm³/h	36.7	48.9	61.1	73.4	98	122.3	146.7	159.0	195.6	220.1	244.6	293.5	586.9	733.7
Thermal efficiency		%	94
Pressure-bearing heat exchanger		MPa	1.0 (2.0)
Power supply	Use power supply	—	380V × 3-phase (50Hz)
Power supply	Electrical power	kw	1.5	4	4	4	4	5.5	5.5	5.5	5.5	5.5	5.5	7.5	18.5	22
Heat transfer area	ontology	m²	14.96	24.41	24.41	24.41	29.53	52.30	52.30	52.30	80.60	80.60	80.60	83.90	177.94	254.20
Hot medium water capacity		L	254.30	403.43	403.43	403.43	495.25	430.00	430.00	430.00	950.00	950.00	950.00	980.00	2443.00	3490.00
Net weight		kilogram	1230	1765	1765	1765	1910	2230	2230	2230	3750	3750	3750	3910	9500	11020
wide	W	mm	1200	1350	1350	1350	1450	1250	1250	1250	1600	1600	1600	1650	2210	2600
long	L	mm	2550	2760	2760	2760	2820	3410	3410	3410	4050	4050	4050	4120	4780	4410
High	H	mm	1600	2010	2010	2010	2010	2260	2260	2260	2600	2600	2600	2600	3300	3310
Basic dimensions	L × W	mm	2350×1400	2550×1550	2550×1550	2550×1550	2550×1650	3000×1450	3000×1450	3000×1450	3550×1800	3550×1800	3550×1800	3550×1850	4880×2310	4450×2700
Connection	Gas supply diameter	DN(mm)	50	50	50	50	50	50	50	50	50	50	50	50	65	80
Connection	Chimney diameter	Φ (mm)	220	260	260	260	300	400	400	400	500	500	500	550	650	800

ZKL0.350-ZKL2.800 (96% high-efficiency type)

Parameter\Model		Unit	ZKL0.350	ZKL0.465	ZKL0.580	ZKL0.700	ZKL0.930	ZKL1.400	ZKL1.510	ZKL1.860	ZKL2.100	ZKL2.300	ZKL2.800
Rated heating capacity		10⁴ kcal/h	30	40	50	60	80	120	130	160	180	200	240
Rated heating capacity		kW	350	465	580	700	930	1400	1510	1860	2100	2300	2800
Heat exchanger	△t=10	°C	60/50
	△t=20	°C	80/60
	△t=25	°C	75/50
	△t=40	°C	60/20
Applicable Fuel			Natural gas
Fuel consumption		Nm³/h	36.9	47.9	59.9	71.8	95.8	143.7	155.7	191.6	215.5	239.5	287.4
Thermal efficiency		%	96
Pressure-bearing heat exchanger		MPa	1.0 (2.0)
Power supply	Use power supply	—	380V × 3-phase (50Hz)
Power supply	Electrical power	kw	1.5	4	4	4	4	5.5	5.5	5.5	5.5	5.5	7.5
Heat transfer area	ontology	m²	14.96	24.41	24.41	24.41	29.53	52.3	52.3	80.6	80.6	80.6	83.9
Heat transfer area	Economizer	m²	3.7	4.1	4.1	4.1	4.6	7.5	7.5	18.2	18.2	18.2	18.2
Hot medium water capacity		L	266.85	428.46	428.46	428.46	512.16	460	460	950	950	950	980
Net weight		kilogram	1390	1920	1920	1920	2070	2490	2490	4250	4250	4250	4480
wide	W	mm	1250	1400	1400	1400	1500	1300	1300	1640	1640	1640	1650
long	L	mm	2920	3160	3160	3160	3210	3780	3780	4560	4560	4560	4660
High	H	mm	1600	2010	2010	2010	2010	2260	2260	2600	2600	2600	2600
Basic dimensions	L × W	mm	2750*1400	2950*1550	2950*1550	2950*1550	2950*1650	3450*1450	3450*1450	4070*1800	4070*1800	4070*1800	4090*1850
Connection	Gas supply diameter	DN(mm)	50	50	50	50	50	50	50	50	50	50	50
Connection	Flue diameter	Φ (mm)	220	260	260	260	300	400	400	500	500	500	550

ZKL0.350-ZKL2.800 (99% high-efficiency type)

Parameter\Model		Unit	ZKL0.350	ZKL0.465	ZKL0.580	ZKL0.700	ZKL0.930	ZKL1.400	ZKL1.510	ZKL1.860	ZKL2.100	ZKL2.300	ZKL2.800
Rated heating capacity		10⁴ kcal/h	30	40	50	60	80	120	130	160	180	200	240
Rated heating capacity		kW	350	465	580	700	930	1400	1510	1860	2100	2300	2800
Heat exchanger	△t=10	°C	60/50
	△t=20	°C	80/60
	△t=25	°C	75/50
	△t=40	°C	60/20
Applicable Fuel			Natural gas
Fuel consumption		Nm³/h	34.8	46.4	58.1	69.7	92.9	139.3	150.9	185.8	209.0	232.2	278.6
Thermal efficiency		%	99
Pressure-bearing heat exchanger		MPa	1.0 (2.0)
Power supply	Use power supply	—	380V × 3-phase (50Hz)
Power supply	Electrical power	kw	1.5	4	4	4	4	5.5	5.5	5.5	5.5	5.5	7.5
Heat transfer area	ontology	m²	14.96	24.41	24.41	24.41	29.53	52.3	52.3	80.6	80.6	80.6	83.9
Heat transfer area	Economizer	m²	8.4	13.9	13.9	13.9	21.1	53	53	51.2	51.2	51.2	61.5
Hot medium water capacity		L	278.17	429.12	429.12	429.12	530.51	480	480	950	950	950	980
Net weight		kilogram	1480	2090	2090	2090	2310	2720	2720	4310	4310	4310	4550
wide	W	mm	1250	1500	1500	1500	1550	1400	1400	1600	1600	1600	1650
long	L	mm	2930	3100	3100	3100	3230	3810	3810	4510	4510	4510	4630
High	H	mm	1600	2010	2010	2010	2040	2260	2260	2600	2600	2600	2600
Basic dimensions	L × W	mm	3000*1400	3200*1550	3200*1550	3200*1550	3300*1650	4000*1450	4000*1450	4710*1800	4710*1800	4710*1800	4830*1850
Connection	Gas supply diameter	DN(mm)	50	50	50	50	50	50	50	50	50	50	50
Connection	Flue diameter	Φ (mm)	220	260	260	260	300	400	400	500	500	500	550

ZKL0.350-ZKL2.800 (102% condensing type)

Parameter\Model		Unit	ZKL0.350	ZKL0.465	ZKL0.580	ZKL0.700	ZKL0.930
Rated heating capacity		10⁴ kcal/h	30	40	50	60	80
Rated heating capacity		kW	350	465	580	700	930
Applicable Fuel			Natural gas
Fuel consumption		Nm³/h	33.8	45.1	56.3	67.6	90.2
Thermal efficiency		%	102
Pressure-bearing heat exchanger		MPa	1.0 (2.0)
Power supply	Use power supply	—	380V × 3-phase (50Hz)
Power supply	Electrical power	kw	1.5	4	4	4	4
Heat transfer area	ontology	m²	14.96	24.41	24.41	24.41	29.53
Heat transfer area	Condenser	m²	11.8	19.5	19.5	19.5	29.5
Hot medium water capacity		L	278.17	429.12	429.12	429.12	530.51
Net weight		kilogram	1530	2145	2145	2145	2390
wide	W	mm	1250	1500	1500	1500	1550
long	L	mm	2930	3130	3130	3130	3230
High	H	mm	1600	2010	2010	2010	2010
Basic dimensions	L × W	mm	3000*1400	3200*1550	3200*1550	3200*1550	3300*1650
Connection	Gas supply diameter	DN(mm)	50	50	50	50	50
Connection	Flue diameter	Φ (mm)	220	260	260	260	300

(3) Example images of installations at the production site

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