Premium instant boiler KDNV-G2PHEX photo 1

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Premium instant boiler

KDNV-G2PHEX

Among hot water boilers

93.5% Highest efficiency
10 ppm Ultra-low NOx

It stably supplies large volumes of hot water to large-scale facilities while meeting hot water demand without a storage tank. Fully proportional control and Korea’s first modular hot water boiler control system provide efficient operation across the entire load range. This tankless hot water system reduces the installation area by 70% compared with conventional hot water systems and lowers maintenance costs by eliminating hot water storage tanks. The indirect-heating boiler design is exempt from licensing and inspection requirements, reducing incidental costs such as inspection, water treatment, and chemical dosing. Our high-performance heat exchanger is designed for smooth hot water flow, preventing scale and foreign-material buildup and maintaining its initial efficiency for more than 10 years.

Main specifications

Full specification table

Model	KDNV-20G2MHEX ~ KDNV-37G2MHEX · 8 models
Rated heat output	0.23 – 0.43 MW (200,000 – 370,000 kcal/h)
Efficiency	99% or Higher (Based on Lower Heating Value)
Control method	Inverter Proportional Control
Power consumption	1.3 kW
Power	220V x 1ø

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3-NO Product

hot water storage tank No

Korea Energy Agency inspection No

scale buildup No

3-NO

How it works and features

Tankless hot water supply system

(Tankless system)
70% less installation space

Compared with conventional hot water systems
No-license, no-inspection products

reduce incidental costs such as inspection and customs fees
Reduced maintenance costs

By simplifying auxiliary facilities
Korea’s highest efficiency: 93%

(Based on higher heating value)
Specially designed high-performance heat exchanger

provides excellent resistance to scale buildup
Fully proportional control

operation
Hot water at an average temperature of 65℃ to 70℃ the risk of infection

reduces Legionella concentration and the likelihood of exposure, lowering

PREMIX BURNER

Premixed Combustion

1No separate combustion chamber is required due to the surface combustion method.
2Fully proportional control operation (15:1)
3The premixed combustion method eliminates furnace explosions associated with forced-mixing systems.
4Ultra-low NOx emissions across the full load range (20 ppm or less)

Premium instant boiler PREMIX BURNER figure 1

Premium instant boiler PREMIX BURNER figure 2

Premium instant boiler PREMIX BURNER figure 3

D-BRAIN (MODULAR SYSTEM)

Developed from 50 years of hot water boiler manufacturing expertise, Korea’s first D-BRAIN modular control system senses load flow and average flow temperatures and optimally controls the number of boilers in operation, helping reduce energy consumption.

1(For installations of 3 or more boilers // up to 16 boilers)

Premium instant boiler D-BRAIN (MODULAR SYSTEM) figure 1

Premium instant boiler D-BRAIN (MODULAR SYSTEM) figure 2

Standard specifications

KDNV-G2PHEX

STANDARD SPECIFICATIONS

Category	Type	Unit	KDNV- 20G2MHEX	KDNV- 23G2MHEX	KDNV- 24G2MHEX	KDNV- 25G2MHEX	KDNV- 30G2MHEX	KDNV- 31G2MHEX	KDNV- 35G2MHEX	KDNV- 37G2MHEX
Boiler Specifications	Rated Heat Output	MW	0.23	0.28	0.28	0.29	0.35	0.36	0.41	0.43
	Rated Heat Output	kcal/h	200,000	237,000	240,800	250,000	300,000	307,000	350,000	370,000
	Efficiency	%	99% or Higher (Based on Lower Heating Value)
	Heat Transfer Area	m²	7.1	7.1	7.1	7.1	7.1	8.0	8.0	8.0
	Burner	-	DP2	DP3
	Burner Capacity	kcal/h	60,000 ~ 300,000	90,000 ~ 450,000
	Control Method	-	Inverter Proportional Control
	Blower Capacity	kW	1.2
	Total Power Consumption	kW	1.3
	Power Supply	V	220V x 1ø
	Product Weight	kg	1,100	1,110	1,120	1,120	1,130	1,210	1,220	1,230
Fuel Consumption	LNG	N㎥/h	20.2	23.9	24.3	25.3	30.3	31.0	35.4	37.4
Fuel Consumption	Propane (LPG)	N㎥/h	9.0	10.7	10.9	11.3	13.5	13.8	15.8	16.7
Connection Size	Gas Inlet	A	25	40
Connection Size	Flue	ømm	200	200	200	200	250	250	250	250
Overall Dimensions	Width (W)	mm	1,050	1,050	1,050	1,050	1,050	1,050	1,050	1,050
	Length (L)		2,250	2,650	2,650	2,650	2,690	2,870	2,870	2,900
	Height (H)		1,780	1,780	1,780	1,780	1,780	1,780	1,780	1,780

Heating & Hot Water Circulation (333K → 343K) {60℃ → 70℃}

Category	Type	Unit	KDNV- 20G2MHEX	KDNV- 23G2MHEX	KDNV- 24G2MHEX	KDNV- 25G2MHEX	KDNV- 30G2MHEX	KDNV- 31G2MHEX	KDNV- 35G2MHEX	KDNV- 37G2MHEX
Heating and Hot Water Circulation	Rated Heat Output	MW	0.23	0.28	0.28	0.29	0.35	0.36	0.41	0.43
	Rated Heat Output	kcal/h	200,000	237,000	240,800	250,000	300,000	307,000	350,000	370,000
	Circulation Flow Rate	ℓ	20,000	23,700	24,080	25,000	30,000	30,700	35,000	37,000
	Max. Working Pressure	MPa{kgf/cm²}	1{10}
	Head Loss	MPa{mH₂O}	0.015{1.5}	0.021{2.1}	0.021{2.1}	0.023{2.3}	0.02{2.0}	0.021{2.1}	0.027{2.7}	0.03{3.0}
	Material	-	Stainless Steel Pipe
	Connection Size	A	50	50	50	50	65	65	65	65

Heating & Hot Water Circulation (333K → 343K) {50℃ → 70℃}

Category	Type	Unit	KDNV- 20G2MHEX	KDNV- 23G2MHEX	KDNV- 24G2MHEX	KDNV- 25G2MHEX	KDNV- 30G2MHEX	KDNV- 31G2MHEX	KDNV- 35G2MHEX	KDNV- 37G2MHEX
Hot Water Supply	Rated Heat Output	MW	0.23	0.28	0.28	0.29	0.35	0.36	0.41	0.43
	Rated Heat Output	kcal/h	200,000	237,000	240,800	250,000	300,000	307,000	350,000	370,000
	Circulation Flow Rate	ℓ	10,000	11,850	12,040	12,500	15,000	15,350	17,500	18,500
	Max. Working Pressure	MPa{kgf/cm²}	1{10}
	Head Loss	MPa{mH₂O}	0.004{0.4}	0.005{0.5}	0.005{0.5}	0.006{0.6}	0.005{0.5}	0.005{0.5}	0.007{0.7}	0.008{0.8}
	Material	-	Stainless Steel Pipe
	Connection Size	A	50	50	50	50	65	65	65	65

Hot Water Supply (298K → 338K) {25℃ → 65℃}

Category	Type	Unit	KDNV- 20G2MHEX	KDNV- 23G2MHEX	KDNV- 24G2MHEX	KDNV- 25G2MHEX	KDNV- 30G2MHEX	KDNV- 31G2MHEX	KDNV- 35G2MHEX	KDNV- 37G2MHEX
Hot Water Supply	Rated Heat Output	MW	0.23	0.28	0.28	0.29	0.35	0.36	0.41	0.43
	Rated Heat Output	kcal/h	200,000	237,000	240,800	250,000	300,000	307,000	350,000	370,000
	Circulation Flow Rate	ℓ	3,333	5,925	6,020	4,167	5,000	5,117	5,833	6,167
	Max. Working Pressure	MPa{kgf/cm²}	1{10}
	Head Loss	MPa{mH₂O}	0.001{0.1}	0.001{0.1}	0.001{0.1}	0.001{0.1}	0.001{0.1}	0.001{0.1}	0.001{0.1}	0.001{0.1}
	Material	-	Stainless Steel Pipe
	Connection Size	A	40	40	40	40	50	50	50	50

The above specification table is presented as follows.
- The fuel heating values used to calculate fuel consumption are based on the following.
- Fuel: Higher Heating Value_Lower Heating Value
- LNG : 11,000_10,000 kcal/Nm³
- Propane: 24,350_22,400 kcal/Nm³
Design flow temperature condition for heating and hot water circulation: 333~343K{60~70℃}
Design flow temperature condition for hot water supply: 298~338K{25~65℃}, 278~338K{5~65℃}
The rated heat outputs for heating and hot water supply apply when each function is used independently. When used simultaneously, their combined output equals the boiler heat output.
The following tolerances account for measurement errors from instruments and operators.
- Boiler efficiency measurement error: ±1%; fuel quantity (heat input) measurement error: ±1.5%
The boiler efficiency stated above is based on the lower heating value.
The specifications above are subject to change without notice.

STANDARD SPECIFICATIONS

Category	Type	Unit	KDNV- 40G2MHEX	KDNV- 42G2MHEX	KDNV- 43G2MHEX	KDNV- 45G2MHEX	KDNV- 50G2MHEX	KDNV- 60G2MHEX
Boiler Specifications	Rated Heat Output	MW	0.47	0.49	0.50	0.52	0.58	0.70
	Rated Heat Output	kcal/h	400,000	420,000	430,000	450,000	500,000	600,000
	Efficiency	%	99% or Higher (Based on Lower Heating Value)
	Heat Transfer Area	m²	8.0	8.0	8.0	8.0	8.0	11.1
	Burner	-	DP5
	Burner Capacity	kcal/h	140,000 ~ 700,000
	Control Method	-	Inverter Proportional Control
	Blower Capacity	kW	1.8
	Total Power Consumption	kW	1.9
	Power Supply	V	220V x 1ø
	Product Weight	kg	1,240	1,250	1,260	1,270	1,280	1,700
Fuel Consumption	LNG	N㎥/h	40.4	42.4	43.4	45.5	50.5	60.6
Fuel Consumption	Propane (LPG)	N㎥/h	18.0	18.9	19.4	20.3	22.5	27.1
Connection Size	Gas Inlet	A	40
Connection Size	Flue	ømm	250	250	250	250	300	300
Overall Dimensions	Width (W)	mm	1,050	1,050	1,050	1,050	1,050	1,050
	Length (L)		2,900	2,900	2,900	2,900	2,960	3,430
	Height (H)		1,780	1,780	1,780	1,780	1,780	1,780

Heating & Hot Water Circulation (333K → 343K) {60℃ → 70℃}

Category	Type	Unit	KDNV- 40G2MHEX	KDNV- 42G2MHEX	KDNV- 43G2MHEX	KDNV- 45G2MHEX	KDNV- 50G2MHEX	KDNV- 60G2MHEX
Heating and Hot Water Circulation	Rated Heat Output	MW	0.47	0.49	0.50	0.52	0.58	0.70
	Rated Heat Output	kcal/h	400,000	420,000	430,000	450,000	500,000	600,000
	Circulation Flow Rate	ℓ	40,000	42,000	43,000	45,000	50,000	60,000
	Max. Working Pressure	MPa{kgf/cm²}	1{10}
	Head Loss	MPa{mH₂O}	0.035{3.5}	0.039{3.9}	0.041{4.1}	0.029{2.9}	0.036{3.6}	0.052{5.2}
	Material	-	Stainless Steel Pipe
	Connection Size	A	65	65	65	80	80	80

Heating & Hot Water Circulation (333K → 343K) {50℃ → 70℃}

Category	Type	Unit	KDNV- 40G2MHEX	KDNV- 42G2MHEX	KDNV- 43G2MHEX	KDNV- 45G2MHEX	KDNV- 50G2MHEX	KDNV- 60G2MHEX
Hot Water Supply	Rated Heat Output	MW	0.47	0.49	0.50	0.52	0.58	0.70
	Rated Heat Output	kcal/h	400,000	420,000	430,000	450,000	500,000	600,000
	Circulation Flow Rate	ℓ	20,000	21,000	21,500	22,500	25,000	30,000
	Max. Working Pressure	MPa{kgf/cm²}	1{10}
	Head Loss	MPa{mH₂O}	0.009{0.9}	0.01{1.0}	0.01{1.0}	0.007{0.7}	0.009{0.9}	0.013{1.3}
	Material	-	Stainless Steel Pipe
	Connection Size	A	65	65	65	80	80	80

Hot Water Supply (298K → 338K) {25℃ → 65℃}

Category	Type	Unit	KDNV- 40G2MHEX	KDNV- 42G2MHEX	KDNV- 43G2MHEX	KDNV- 45G2MHEX	KDNV- 50G2MHEX	KDNV- 60G2MHEX
Hot Water Supply	Rated Heat Output	MW	0.47	0.49	0.50	0.52	0.58	0.70
	Rated Heat Output	kcal/h	400,000	420,000	430,000	450,000	500,000	600,000
	Circulation Flow Rate	ℓ	6,667	7,000	7,167	7,500	8,333	10,000
	Max. Working Pressure	MPa{kgf/cm²}	1{10}
	Head Loss	MPa{mH₂O}	0.002{0.2}	0.002{0.2}	0.002{0.2}	0.001{0.1}	0.002{0.2}	0.002{0.2}
	Material	-	Stainless Steel Pipe
	Connection Size	A	50	50	50	65	65	65

STANDARD SPECIFICATIONS

Category	Type	Unit	KDNV- 70G2MHEX	KDNV- 75G2MHEX	KDNV- 80G2MHEXS	KDNV- 80G2MHEX	KDNV- 100G2MHEX
Boiler Specifications	Rated Heat Output	MW	0.81	0.87	0.93	0.93	1.16
	Rated Heat Output	kcal/h	700,000	750,000	800,000	800,000	1,000,000
	Efficiency	%	99% or Higher (Based on Lower Heating Value)
	Heat Transfer Area	m²	11.1	11.1	11.1	16.1	17.4
	Burner	-	DP8				DP10
	Burner Capacity	kcal/h	200,000 ~ 1,000,000				250,000 ~ 1,250,000
	Control Method	-	Inverter Proportional Control
	Blower Capacity	kW	2.9				3.6
	Total Power Consumption	kW	3.0				3.7
	Power Supply	V	380V x 3ø
	Product Weight	kg	1,710	1,720	1,750	1,900	2,050
Fuel Consumption	LNG	N㎥/h	70.7	75.8	80.8	80.8	101.0
Fuel Consumption	Propane (LPG)	N㎥/h	31.6	33.8	36.1	36.1	45.1
Connection Size	Gas Inlet	A	50				50
Connection Size	Flue	ømm	300	300	350	350	350
Overall Dimensions	Width (W)	mm	1,050	950	950	1,240	1,240
	Length (L)		3,480	3,640	3,640	3,640	3,740
	Height (H)		1,780	1,780	1,780	1,590	1,590

Heating & Hot Water Circulation (333K → 343K) {60℃ → 70℃}

Category	Type	Unit	KDNV- 70G2MHEX	KDNV- 75G2MHEX	KDNV- 80G2MHEXS	KDNV- 80G2MHEX	KDNV- 100G2MHEX
Heating and Hot Water Circulation	Rated Heat Output	MW	0.81	0.87	0.93	0.93	1.16
	Rated Heat Output	kcal/h	700,000	750,000	800,000	800,000	1,000,000
	Circulation Flow Rate	ℓ	70,000	75,000	80,000	80,000	100,000
	Max. Working Pressure	MPa{kgf/cm²}	1{10}
	Head Loss	MPa{mH₂O}	0.045{4.5}	0.052{5.2}	0.059{5.9}	0.059{5.9}	0.093{9.3}
	Material	-	Stainless Steel Pipe
	Connection Size	A	100	100	100	100	100

Heating & Hot Water Circulation (333K → 343K) {50℃ → 70℃}

Category	Type	Unit	KDNV- 70G2MHEX	KDNV- 75G2MHEX	KDNV- 80G2MHEXS	KDNV- 80G2MHEX	KDNV- 100G2MHEX
Hot Water Supply	Rated Heat Output	MW	0.81	0.87	0.93	0.93	1.16
	Rated Heat Output	kcal/h	700,000	750,000	800,000	800,000	1,000,000
	Circulation Flow Rate	ℓ	35,000	37,500	40,000	40,000	50,000
	Max. Working Pressure	MPa{kgf/cm²}	1{10}
	Head Loss	MPa{mH₂O}	0.011{1.1}	0.013{1.3}	0.015{1.5}	0.015{1.5}	0.023{2.3}
	Material	-	Stainless Steel Pipe
	Connection Size	A	100	100	100	100	100

Hot Water Supply (298K → 338K) {25℃ → 65℃}

Category	Type	Unit	KDNV- 70G2MHEX	KDNV- 75G2MHEX	KDNV- 80G2MHEXS	KDNV- 80G2MHEX	KDNV- 100G2MHEX
Hot Water Supply	Rated Heat Output	MW	0.81	0.87	0.93	0.93	1.16
	Rated Heat Output	kcal/h	700,000	750,000	800,000	800,000	1,000,000
	Circulation Flow Rate	ℓ	11,667	12,500	13,333	13,333	16,667
	Max. Working Pressure	MPa{kgf/cm²}	1{10}
	Head Loss	MPa{mH₂O}	0.002{0.2}	0.002{0.2}	0.003{0.3}	0.003{0.3}	0.004{0.4}
	Material	-	Stainless Steel Pipe
	Connection Size	A	80	80	80	80	80

The above specification table is presented as follows.
- The fuel heating values used to calculate fuel consumption are based on the following.
- Fuel: Higher Heating Value_Lower Heating Value
- LNG : 11,000_10,000 kcal/Nm³
- Propane: 24,350_22,400 kcal/Nm³
Design flow temperature condition for heating and hot water circulation: 333~343K{60~70℃}
Design flow temperature condition for hot water supply: 298~338K{25~65℃}
The rated heat outputs for heating and hot water supply apply when each function is used independently. When used simultaneously, their combined output equals the boiler heat output.
The following tolerances account for measurement errors from instruments and operators.
- Boiler efficiency measurement error: ±1%; fuel quantity (heat input) measurement error: ±1.5%
The boiler efficiency stated above is based on the lower heating value.
The specifications above are subject to change without notice.

Consultation and quotes

Tell us where the boiler will be installed and what it is for.
Our engineers will get back to you.

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KDNV-G2PHEX

Among hot water boilers

Main specifications

3-NO Product

How it works and features

Tankless hot water supply system

70% less installation space

No-license, no-inspection products

Reduced maintenance costs

Korea’s highest efficiency: 93%

Specially designed high-performance heat exchanger

Fully proportional control

Hot water at an average temperature of 65℃ to 70℃ the risk of infection

PREMIX BURNER

D-BRAIN (MODULAR SYSTEM)

Standard specifications

STANDARD SPECIFICATIONS

Heating & Hot Water Circulation (333K → 343K) {60℃ → 70℃}

Heating & Hot Water Circulation (333K → 343K) {50℃ → 70℃}

Hot Water Supply (298K → 338K) {25℃ → 65℃}

STANDARD SPECIFICATIONS

Heating & Hot Water Circulation (333K → 343K) {60℃ → 70℃}

Heating & Hot Water Circulation (333K → 343K) {50℃ → 70℃}

Hot Water Supply (298K → 338K) {25℃ → 65℃}

STANDARD SPECIFICATIONS

Heating & Hot Water Circulation (333K → 343K) {60℃ → 70℃}

Heating & Hot Water Circulation (333K → 343K) {50℃ → 70℃}

Hot Water Supply (298K → 338K) {25℃ → 65℃}

Consultation and quotes