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Vacuum hot water boiler Pressureless hot water boiler Once-through steam boiler Flue and smoke tube boiler Electric steam boiler

High efficiency vacuum hot water boiler
Vacuum hot water boiler

KDNV-GVHEX series KDNV-G2X series KDNV-G2HEX series

High efficiency vacuum hot water boiler

KDNV-GVHEX series

Operating principle and features

The KDNV vacuum hot water boiler encloses a fixed amount of heating medium water and keeps it in a vacuum (negative pressure) state in the boiler body. When the medium water is heated, it immediately evaporates into decompressed steam to indirectly heat the heat exchanger to provide hygienic water

Multi-purpose heat exchangers

Heat exchangers can be used for heating, hot water supply and circulation heating in 1~3 circuits depending on the user’s demand. Each heat exchanger is independently installed and provides hygienic water without water mixing.

Low NOx burner attached as default

Fuel saving low NOx burner is attached as default and guarantees 40ppm or less when operating under 4% of O2

Absolutely safe design

Unlike pressure boilers, the KDNV vacuum hot water boiler operates under negative pressure (pressure below atmospheric pressure) and has no risk of explosion. 4-level safety devices (Vacuum pressure, over heat prevention, boiler body thermistor and low water level switches) further ensures the reliability of the product.

Semi-permanent life

As the boiler water (heating medium water) of the vacuum hot water boiler is always kept in a fixed amount under vacuum condition without moving, there are no risks of corrosion or scale accumulation caused by dissolved oxygen. In addition with hygienic high corrosion resistant stainless steel heat exchangers, the boiler body is semi-permanent.

Fuel cost reduction with high efficiency furnace design

The high efficiency body design, which adopts once-through characteristics of the water tube boiler, forms the water cooling wall structure and heat absorbing 3-pass structure, greatly reduces fuel costs.

High efficiency economizer

Condensing economizer can be attached to the flue to drastically reduce fuel cost (Option)

Helium gas leak detector

Check any leakage after processing the boiler body → Check any leakage after assembling the heat exchange r→ Check any leakage after assembling the finished product
To produce vacuum boilers with perfect vacuum condition, a helium gas leak detector is used in 3 steps during production. By using helium detector at near perfect vacuum condition of 10-3 Torr ~ 10-7 Torr, the system automatically detects even the smallest gap or air leak from the welded part, where no fluid can normally leak through.

Standard specifications for low NOx high-efficiency vacuum hot water boiler KDNV- GVHEX series

Category		Unit	KDNV-GVHEX series
			Vertical Type
			KDNV- 10G2VHEX	KDNV- 15G2VHEX	KDNV- 20GVHEX	KDNV- 25GVHEX	KDNV- 30GVHEX	KDNV- 35GVHEX	KDNV- 40GVHEX	KDNV- 45GVHEX	KDNV- 50GVHEX
Boiler specifications	Rated heat output	MW	0.12	0.17	0.23	0.29	0.35	0.41	0.47	0.52	0.58
	Rated heat output	kcal/h	100,000	150,000	200,000	250,000	300,000	350,000	400,000	450,000	500,000
	Efficiency	%	98.3%
	Heating area	㎡	5.43	5.85	8.30	8.60	10.10	10.10	11.20	11.50	12.00
	Burner	-	KLN-200(U)		MAXI 25(LX)	MAXI 32(LX)	P4M (LX)		P5M (LX)
	Burner capacity(MAX)	kcal/h	215,000		295,000	411,000	550,000		650,000
	Control method	-	ON - OFF			HI - LOW - OFF
	Blower motor capacity	kW	0.25		0.37		0.75		1.50
	Total power consumption	kW	0.35		0.47		0.85		1.60
	Power	V	220V x 1ø x 60Hz				380V x 3ø x 60Hz
Fuel consumption	LNG	N㎥/h	10.2	15.3	20.30	25.40	30.50	35.60	40.70	45.80	50.90
Fuel consumption	Propane(LPG)	N㎥/h	-	-	9.1	11.4	13.6	15.9	18.2	20.4	22.7
Diameter	Gas inlet	A	25	25	25	40	40	40	50	50	50
Diameter	Flue	ømm	200	200	200	200	250	250	250	250	300
External size	Width(W)	mm	1160	1160	1,300	1,300	1,400	1,400	1,550	1,550	1,550
	Length(L)		1790	1790	2,030	2,030	2,170	2,170	2,690	2,690	2,740
	Height(H)		1780	1780	2,000	2,000	2,030	2,030	2,120	2,120	2,120
Product weight		kg	620	640	820	850	960	1,100	1,190	1,210	1,250

For heating and hot water circulation (333K → 343K) {60℃ → 70℃}

Category		Unit	KDNV-GVHEX series
Category		Unit	KDNV- 10G2VHEX	KDNV- 15G2VHEX	KDNV- 20GVHEX	KDNV- 25GVHEX	KDNV- 30GVHEX	KDNV- 35GVHEX	KDNV- 40GVHEX	KDNV- 45GVHEX	KDNV- 50GVHEX
For heating and hot water circulation	Rated heat output	MW	0.12	0.17	0.23	0.29	0.35	0.41	0.47	0.52	0.58
	Rated heat output	kcal/h	100,000	150,000	200,000	250,000	300,000	350,000	400,000	450,000	500,000
	Circulation volume	ℓ	10,000	15,000	20,000	25,000	30,000	35,000	40,000	45,000	50,000
	Maximum operating pressure	MPa{kgf/㎠}	1{10}
	Head pressure loss	MPa{mH2O}	0.012{0.12}	0.017{0.17}		0.02{0.2}		0.018{0.18}		0.022{0.22}	0.02{0.2}
	Material	-	Stainless steel pipe
	Connection diameter	A	40	40	50	50	50	50	65	65	65

For hot water supply (298K → 338K) {25℃ → 65℃}

Category		Unit	KDNV-GVHEX series
Category		Unit	KDNV- 10G2VHEX	KDNV- 15G2VHEX	KDNV- 20GVHEX	KDNV- 25GVHEX	KDNV- 30GVHEX	KDNV- 35GVHEX	KDNV- 40GVHEX	KDNV- 45GVHEX	KDNV- 50GVHEX
For hot water supply	Rated heat output	MW	0.12	0.17	0.23	0.29	0.35	0.41	0.47	0.52	0.58
	Rated heat output	kcal/h	100,000	150,000	200,000	250,000	300,000	350,000	400,000	450,000	500,000
	Circulation volume	ℓ	2500	3750	5,000	6,250	7,500	8,750	10,000	11,250	12,500
	Maximum operating pressure	MPa{kgf/㎠}	1{10}
	Head pressure loss	MPa{mH2O}	0.012{0.12}	0.017{0.17}		0.02{0.2}		0.018{0.18}		0.022{0.22}	0.02{0.2}
	Material	-	Stainless steel pipe
	Connection diameter	A	40	40	50	50	50	50	65	65	65

For hot water supply (278K → 338K) {5℃ → 65℃}

Category		Unit	KDNV-GVHEX series
Category		Unit	KDNV- 10G2VHEX	KDNV- 15G2VHEX	KDNV- 20GVHEX	KDNV- 25GVHEX	KDNV- 30GVHEX	KDNV- 35GVHEX	KDNV- 40GVHEX	KDNV- 45GVHEX	KDNV- 50GVHEX
For hot water supply	Rated heat output	MW	0.12	0.17	0.23	0.29	0.35	0.41	0.47	0.52	0.58
	Rated heat output	kcal/h	100,000	150,000	200,000	250,000	300,000	350,000	400,000	450,000	500,000
	Circulation volume	ℓ	1667	2500	3,333	4,167	5,000	5,833	6,667	7,500	8,333
	Maximum operating pressure	MPa{kgf/㎠}	1{10}
	Head pressure loss	MPa{mH2O}	0.006{0.06}	0.015{0.15}		0.018{0.18}		0.015{0.15}		0.02{0.2}	0.018{0.18}
	Material	-	Stainless steel pipe
	Connection diameter	A	40	40	50	50	50	50	65	65	65

The above specification table is indicated as follows.
- The fuel calorific value of fuel consumption is based on the following.
- Fuel: Higher calorific value _ Lower calorific value
- LNG : 11,000_10,000 kcal/N㎥
- Propane : 24,350_22,400 kcal/N㎥
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 output for heating and hot water supply is given for each individual use, and in the case of simultaneous use, the total is the boiler heat output.
The following tolerances are included due to the measurement errors of the measuring instrument or measuring personnel.
- Boiler efficiency measurement error ±1%, fuel amount (heat input) measurement error ±1.5%
The above boiler efficiency is based on the true heat generation (low heat generation).
The above specification table is subject to change without notice.

High efficiency vacuum hot water boiler

KDNV-G2X series

Operating principle and features

The KDNV vacuum hot water boiler encloses a fixed amount of heating medium water and keeps it in a vacuum (negative pressure) state in the boiler body. When the medium water is heated, it immediately evaporates into decompressed steam to indirectly heat the heat exchanger to provide hygienic water

Multi-purpose heat exchangers

Heat exchangers can be used for heating, hot water supply and circulation heating in 1~3 circuits depending on the user’s demand. Each heat exchanger is independently installed and provides hygienic water without water mixing.

Low NOx burner attached as default

Fuel saving low NOx burner is attached as default and guarantees 40ppm or less when operating under 4% of O2

Absolutely safe design

Unlike pressure boilers, the KDNV vacuum hot water boiler operates under negative pressure (pressure below atmospheric pressure) and has no risk of explosion. 4-level safety devices (Vacuum pressure, over heat prevention, boiler body thermistor and low water level switches) further ensures the reliability of the product.

Semi-permanent life

As the boiler water (heating medium water) of the vacuum hot water boiler is always kept in a fixed amount under vacuum condition without moving, there are no risks of corrosion or scale accumulation caused by dissolved oxygen. In addition with hygienic high corrosion resistant stainless steel heat exchangers, the boiler body is semi-permanent.

Fuel cost reduction with high efficiency furnace design

The high efficiency body design, which adopts once-through characteristics of the water tube boiler, forms the water cooling wall structure and heat absorbing 3-pass structure, greatly reduces fuel costs.

High efficiency economizer

Condensing economizer can be attached to the flue to drastically reduce fuel cost (Option)

Helium gas leak detector

Check any leakage after processing the boiler body → Check any leakage after assembling the heat exchanger→ Check any leakage after assembling the finished product
To produce vacuum boilers with perfect vacuum condition, a helium gas leak detector is used in 3 steps during production. By using helium detector at near perfect vacuum condition of 10-3 Torr ~ 10-7 Torr, the system automatically detects even the smallest gap or air leak from the welded part, where no fluid can normally leak through.

Standard specifications for low NOx high-efficiency vacuum hot water boiler KDNV-G2X series

Category		Unit	KDNV-G2X series
			Horizontal Type
			KDNV- 20G2X	KDNV- 25G2X	KDNV- 30G2X	KDNV- 35G2X	KDNV- 40G2X	KDNV- 45G2X	KDNV- 50G2X	KDNV- 60G2X	KDNV- 80G2X	KDNV- 100G2X
Boiler specifications	Rated heat output	MW	0.23	0.29	0.35	0.41	0.47	0.52	0.58	0.70	0.93	1.16
	Rated heat output	kcal/h	200,000	250,000	300,000	350,000	400,000	450,000	500,000	600,000	800,000	1,000,000
	Efficiency	%	98.3%
	Heating area	㎡	12.12	13.29	15.57	15.69	16.78	17.07	18.85	19.71	22.02	27.96
	Burner	-	MAXI 25(LX)	MAXI 32(LX)	P4M (LX)		P5M (LX)		P60M (LX)		P72M (LX)
	Burner capacity(MAX)	kcal/h	295,000	411,000	550,000		650,000		800,000		1,800,000
	Control method	-	ON - OFF	HI - LOW - OFF
	Blower motor capacity	kW	0.37		0.75		1.50				3.00
	Total power consumption	kW	0.47		0.85		1.60				3.10
	Power	V	220V x 1ø x 60Hz		380V x 3ø x 60Hz
Fuel consumption	LNG	N㎥/h	20.30	25.40	30.50	35.60	40.70	45.80	50.90	61.00	81.40	101.70
Fuel consumption	Propane(LPG)	N㎥/h	9.1	11.4	13.6	15.9	18.2	20.4	22.7	27.2	36.3	45.4
Diameter	Gas inlet	A	25	40	40	40	50	50	50	50	50	50
Diameter	Flue	ømm	200	250	250	250	250	250	300	300	350	400
External size	Width(W)	mm	1,240	1,240	1,240	1,240	1,240	1,240	1,240	1,470	1,610	1,630
	Length(L)		2,500	2,560	2,710	2,760	2,810	3,180	3,500	3,240	3,640	3,920
	Height(H)		1,570	1,570	1,570	1,570	1,570	1,570	1,570	2,340	2,340	2,530
Product weight		kg	1,380	1,450	1,570	1,600	1,650	1,800	2,030	2,580	3,100	3,750

For heating and hot water circulation (333K → 343K) {60℃ → 70℃}

Category		Unit	KDNV-G2X series
Category		Unit	KDNV- 20G2X	KDNV- 25G2X	KDNV- 30G2X	KDNV- 35G2X	KDNV- 40G2X	KDNV- 45G2X	KDNV- 50G2X	KDNV- 60G2X	KDNV- 80G2X	KDNV- 100G2X
For heating and hot water circulation	Rated heat output	MW	0.23	0.29	0.35	0.41	0.47	0.52	0.58	0.70	0.93	1.16
	Rated heat output	kcal/h	200,000	250,000	300,000	350,000	400,000	450,000	500,000	600,000	800,000	1,000,000
	Circulation volume	ℓ	20,000	25,000	30,000	35,000	40,000	45,000	50,000	60,000	80,000	100,000
	Maximum operating pressure	MPa{kgf/㎠}	1{10}
	Head pressure loss	MPa{mH2O}	0.017{0.17}	0.02{0.2}		0.018{0.18}		0.022{0.22}	0.02{0.2}	0.022{0.22}	0.03{0.3}	0.033{0.33}
	Material	-	Stainless steel pipe
	Connection diameter	A	50	65	65	80	80	80	80	100	100	100

For hot water supply (298K → 338K) {25℃ → 65℃}

Category		Unit	KDNV-G2X series
Category		Unit	KDNV- 20G2X	KDNV- 25G2X	KDNV- 30G2X	KDNV- 35G2X	KDNV- 40G2X	KDNV- 45G2X	KDNV- 50G2X	KDNV- 60G2X	KDNV- 80G2X	KDNV- 100G2X
For hot water supply	Rated heat output	MW	0.23	0.29	0.35	0.41	0.47	0.52	0.58	0.70	0.93	1.16
	Rated heat output	kcal/h	200,000	250,000	300,000	350,000	400,000	450,000	500,000	600,000	800,000	1,000,000
	Hot water supply	ℓ	5,000	6,250	7,500	8,750	10,000	11,250	12,500	15,000	20,000	25,000
	Maximum operating pressure	MPa{kgf/㎠}	1{10}
	Head pressure loss	MPa{mH2O}	0.017{0.17}	0.02{0.2}		0.018{0.18}		0.022{0.22}	0.02{0.2}	0.022{0.22}	0.03{0.3}	0.033{0.33}
	Material	-	Stainless steel pipe
	Connection diameter	A	40	40	40	40	40	50	50	50	65	65

For hot water supply (278K → 338K) {5℃ → 65℃}

Category		Unit	KDNV-G2X series
Category		Unit	KDNV- 20G2X	KDNV- 25G2X	KDNV- 30G2X	KDNV- 35G2X	KDNV- 40G2X	KDNV- 45G2X	KDNV- 50G2X	KDNV- 60G2X	KDNV- 80G2X	KDNV- 100G2X
For hot water supply	Rated heat output	MW	0.23	0.29	0.35	0.41	0.47	0.52	0.58	0.70	0.93	1.16
	Rated heat output	kcal/h	200,000	250,000	300,000	350,000	400,000	450,000	500,000	600,000	800,000	1,000,000
	Hot water supply	ℓ	3,333	4,167	5,000	5,833	6,667	7,500	8,333	10,000	13,333	16,667
	Maximum operating pressure	MPa{kgf/㎠}	1{10}
	Head pressure loss	MPa{mH2O}	0.015{0.15}	0.018{0.18}		0.015{0.15}		0.02{0.2}	0.018{0.18}	0.02{0.2}	0.024{0.24}	0.033{0.33}
	Material	-	Stainless steel pipe
	Connection diameter	A	40	40	40	40	40	50	50	50	65	65

The above specification table is indicated as follows.
- The fuel calorific value of fuel consumption is based on the low-level calorific value.
- Fuel: Higher calorific value _ Lower calorific value
- LNG : 11,000_10,000 kcal/N㎥
- Propane : 24,350_22,400 kcal/N㎥
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 output for heating and hot water supply is given for each individual use, and in the case of simultaneous use, the total is the boiler heat output.
The following tolerances are included due to the measurement errors of the measuring instrument or measuring personnel.
- Boiler efficiency measurement error ±1%, fuel amount (heat input) measurement error ±1.5%
The above boiler efficiency is based on the true heat generation (low heat generation).
The above specification table is subject to change without notice.

High efficiency vacuum hot water boiler

KDNV-G2HEX series

Operating principle and features

The KDNV vacuum hot water boiler encloses a fixed amount of heating medium water and keeps it in a vacuum (negative pressure) state in the boiler body. When the medium water is heated, it immediately evaporates into decompressed steam to indirectly heat the heat exchanger to provide hygienic water

Multi-purpose heat exchangers

Heat exchangers can be used for heating, hot water supply and circulation heating in 1~3 circuits depending on the user’s demand. Each heat exchanger is independently installed and provides hygienic water without water mixing.

Low NOx burner attached as default

Fuel saving low NOx burner is attached as default and guarantees 40ppm or less when operating under 4% of O2

Absolutely safe design

Unlike pressure boilers, the KDNV vacuum hot water boiler operates under negative pressure (pressure below atmospheric pressure) and has no risk of explosion. 4-level safety devices (Vacuum pressure, over heat prevention, boiler body thermistor and low water level switches) further ensures the reliability of the product.

Semi-permanent life

As the boiler water (heating medium water) of the vacuum hot water boiler is always kept in a fixed amount under vacuum condition without moving, there are no risks of corrosion or scale accumulation caused by dissolved oxygen. In addition with hygienic high corrosion resistant stainless steel heat exchangers, the boiler body is semi-permanent.

Fuel cost reduction with high efficiency furnace design

The high efficiency body design, which adopts once-through characteristics of the water tube boiler, forms the water cooling wall structure and heat absorbing 3-pass structure, greatly reduces fuel costs.

High efficiency economizer

Condensing economizer can be attached to the flue to drastically reduce fuel cost (Option)

Helium gas leak detector

Check any leakage after processing the boiler body → Check any leakage after assembling the heat exchanger→ Check any leakage after assembling the finished product
To produce vacuum boilers with perfect vacuum condition, a helium gas leak detector is used in 3 steps during production. By using helium detector at near perfect vacuum condition of 10-3 Torr ~ 10-7 Torr, the system automatically detects even the smallest gap or air leak from the welded part, where no fluid can normally leak through.

tandard specifications for low NOx high-efficiency vacuum hot water boiler G2HEX series

Category		Unit	KDNV-G2HEX series
			Hot water generator mounted type
			KDNV- 20G2HEX	KDNV- 25G2HEX	KDNV- 30G2HEX	KDNV- 35G2HEX	KDNV- 40G2HEX	KDNV- 45G2HEX	KDNV- 50G2HEX	KDNV- 60G2HEX	KDNV- 80G2HEX	KDNV- 100G2HEX	KDNV- 120G2HEX	KDNV- 130G2HEX	KDNV- 150G2HEX	KDNV- 160G2HEX	KDNV- 180G2HEX	KDNV- 200G2HEX
Boiler specifications	Rated heat output	MW	0.23	0.29	0.35	0.41	0.47	0.52	0.58	0.70	0.93	1.16	1.40	1.51	1.74	1.86	2.09	2.33
	Rated heat output	kcal/h	200,000	250,000	300,000	350,000	400,000	450,000	500,000	600,000	800,000	1,000,000	1,200,000	1,300,000	1,500,000	1,600,000	1,800,000	2,000,000
	Efficiency	%	98.3%
	Heating area	㎡	10.1	10.1	10.1	11.0	11.0	12.2	12.2	14.5	18.2	19.9	22.0	22.0	25.0	25.0	28.0	31.0
	Burner	-	MAXI 25(LX)	MAXI 32(LX)	P4M (LX)		P5M (LX)		P60M (LX)		P72M (LX)	P9M(LX)	S-4TG(LX)
	Burner capacity (MAX)	kcal/h	295,000	411,000	550,000		650,000		800,000		1,500,000	2,000,000	3,200,000
	Control method	-	ON - OFF	HI - LOW - OFF									HI - MIDDLE - LOW - OFF
	Blower capacity	kW	0.37	0.37	0.75	0.75	1.50	1.50	1.50	1.50	3.00	4.00	5.50	5.50	7.50	7.50	11.00	11.00
	Total power consumption	kW	0.47	0.47	0.85	0.85	1.60	1.60	1.60	1.60	3.10	4.10	5.60	5.60	7.60	7.60	11.10	11.10
	Power	V	220V x 1ø x 60Hz		380V x 3ø x 60Hz
Fuel consumption	LNG	N㎥/h	20.3	25.4	30.5	35.6	40.7	45.8	50.9	61.0	81.4	101.7	122.1	132.2	152.6	162.8	183.1	203.5
Fuel consumption	Propane(LPG)	N㎥/h	9.1	11.4	13.6	15.9	18.2	20.4	22.7	27.2	36.3	45.4	54.5	59.0	68.1	72.7	81.7	90.8
Diameter	Gas inlet	A	25	40	40	40	50	50	50	50	50	50	65	65	65	65	65	65
Diameter	Flue	ømm	200	250	250	250	250	250	300	300	350	350	400	400	450	450	450	500
External size	Width(W)	mm	1,060	1,060	1,060	1,310	1,310	1,310	1,310	1,310	1,530	1,530	1,660	1,660	1,700	1,700	1,700	1,700
	Length(L)		2,750	2,880	2,980	3,130	3,230	3,360	3,360	3,490	4,120	4,320	3,580	3,580	3,830	3,830	3,960	4,210
	Height(H)		1,810	1,810	1,810	1,900	1,900	1,900	1,900	1,910	2,070	2,190	2,670	2,670	2,740	2,740	2,790	2,790
Product weight		kg	1,600	1,700	1,750	2,070	2,120	2,200	2,250	2,400	3,100	3,300	3,600	3,750	4,200	4,500	4,850	5,100

For heating and hot water circulation (333K → 343K) {60℃ → 70℃}

Category		Unit	KDNV- 20G2HEX	KDNV- 25G2HEX	KDNV- 30G2HEX	KDNV- 35G2HEX	KDNV- 40G2HEX	KDNV- 45G2HEX	KDNV- 50G2HEX	KDNV- 60G2HEX	KDNV- 80G2HEX	KDNV- 100G2HEX	KDNV- 120G2HEX	KDNV- 130G2HEX	KDNV- 150G2HEX	KDNV- 160G2HEX	KDNV- 180G2HEX	KDNV- 200G2HEX
For heating and hot water circulation	Rated heat output	MW	0.23	0.29	0.35	0.41	0.47	0.52	0.58	0.70	0.93	1.16	1.40	1.51	1.74	1.86	2.09	2.33
	Rated heat output	kcal/h	200,000	250,000	300,000	350,000	400,000	450,000	500,000	600,000	800,000	1,000,000	1,200,000	1,300,000	1,500,000	1,600,000	1,800,000	2,000,000
	Circulation volume	ℓ	20,000	25,000	30,000	35,000	40,000	45,000	50,000	60,000	80,000	100,000	120,000	130,000	150,000	160,000	180,000	200,000
	Maximum operating pressure	MPa{kgf/㎠}	1{10}
	Head pressure loss	MPa{mH2O}	0.017{0.17}	0.02{0.2}		0.018{0.18}		0.022{0.22}	0.02{0.2}	0.022{0.22}	0.03{0.3}	0.033{0.33}	0.02{0.2}	0.022{0.22}	0.033{0.33}	0.03{0.3}	0.02{0.2}	0.022{0.22}
	Material	-	Stainless steel pipe
	Connection diameter	A	50	50	65	65	65	80	80	100	100	100	125	125	125	125	150	150

For hot water supply (298K → 338K) {25℃ → 65℃}

Category		Unit	KDNV- 20G2HEX	KDNV- 25G2HEX	KDNV- 30G2HEX	KDNV- 35G2HEX	KDNV- 40G2HEX	KDNV- 45G2HEX	KDNV- 50G2HEX	KDNV- 60G2HEX	KDNV- 80G2HEX	KDNV- 100G2HEX	KDNV- 120G2HEX	KDNV- 130G2HEX	KDNV- 150G2HEX	KDNV- 160G2HEX	KDNV- 180G2HEX	KDNV- 200G2HEX
For hot water supply	Rated heat output	MW	0.23	0.29	0.35	0.41	0.47	0.52	0.58	0.70	0.93	1.16	1.40	1.51	1.74	1.86	2.09	2.33
	Rated heat output	kcal/h	200,000	250,000	300,000	350,000	400,000	450,000	500,000	600,000	800,000	1,000,000	1,200,000	1,300,000	1,500,000	1,600,000	1,800,000	2,000,000
	Circulation volume	ℓ	5,000	6,250	7,500	8,750	10,000	11,250	12,500	15,000	20,000	25,000	30,000	32,500	37,500	40,000	45,000	50,000
	Maximum operating pressure	MPa{kgf/㎠}	1{10}
	Head pressure loss	MPa{mH2O}	0.017{0.17}	0.02{0.2}		0.018{0.18}		0.022{0.22}	0.02{0.2}	0.022{0.22}	0.03{0.3}	0.033{0.33}	0.02{0.2}	0.022{0.22}	0.033{0.33}	0.03{0.3}	0.02{0.2}	0.022{0.22}
	Material	-	Stainless steel pipe
	Connection diameter	A	40	40	50	50	50	50	50	50	65	65	100	100	100	100	100	100

For hot water supply (278K → 338K) {5℃ → 65℃}

Category		Unit	KDNV- 20G2HEX	KDNV- 25G2HEX	KDNV- 30G2HEX	KDNV- 35G2HEX	KDNV- 40G2HEX	KDNV- 45G2HEX	KDNV- 50G2HEX	KDNV- 60G2HEX	KDNV- 80G2HEX	KDNV- 100G2HEX	KDNV- 120G2HEX	KDNV- 130G2HEX	KDNV- 150G2HEX	KDNV- 160G2HEX	KDNV- 180G2HEX	KDNV- 200G2HEX
For hot water supply	Rated heat output	MW	0.23	0.29	0.35	0.41	0.47	0.52	0.58	0.70	0.93	1.16	1.40	1.51	1.74	1.86	2.09	2.33
	Rated heat output	kcal/h	200,000	250,000	300,000	350,000	400,000	450,000	500,000	600,000	800,000	1,000,000	1,200,000	1,300,000	1,500,000	1,600,000	1,800,000	2,000,000
	Circulation volume	ℓ	3,333	4,167	5,000	5,833	6,667	7,500	8,333	10,000	13,333	16,667	20,000	21,667	25,000	26,667	30,000	33,333
	Maximum operating pressure	MPa{kgf/㎠}	1{10}
	Head pressure loss	MPa{mH2O}	0.015{0.15}	0.018{0.18}		0.015{0.15}		0.02{0.2}	0.018{0.18}	0.02{0.2}	0.024{0.24}	0.033{0.33}	0.02{0.2}	0.022{0.22}	0.033{0.33}	0.03{0.3}	0.02{0.2}	0.022{0.22}
	Material	-	Stainless steel pipe
	Connection diameter	A	40	40	40	40	40	50	50	50	65	65	100	100	100	100	100	100

The above specification table is indicated as follows.
- The fuel calorific value of fuel consumption is based on the following.
- Fuel: Higher calorific value _ Lower calorific value
- LNG : 11,000_10,000 kcal/N㎥
- Propane : 24,350_22,400 kcal/N㎥
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 output for heating and hot water supply is given for each individual use, and in the case of simultaneous use, the total is the boiler heat output.
The following tolerances are included due to the measurement errors of the measuring instrument or measuring personnel.
- Boiler efficiency measurement error ±1%, fuel amount (heat input) measurement error ±1.5%
The above boiler efficiency is based on the true heat generation (low heat generation).
The above specification table is subject to change without notice.

Vacuum hot water boiler

KDNV series in the small capacity type, KDNV series in the large capacity type

KDNV series in the small capacity type

KDNV series in the large capacity type

Operating principle and features

The KDNV vacuum hot water boiler encloses a fixed amount of heating medium water and keeps it in a vacuum (negative pressure) state in the boiler body. When the medium water is heated, it immediately evaporates into decompressed steam to indirectly heat the heat exchanger to provide hygienic water

Fuel cost reduction with high efficiency furnace design

The high efficiency body design, which adopts once-through characteristics of the water tube boiler, forms the water cooling wall structure and heat absorbing 3-pass structure, greatly reduces fuel costs.

Easy handling, no license and inspection required

Anyone can operate The KDNV vacuum hot water boiler as it is exempt from all laws and regulations in Korea (By law, the boiler is viewed as explosion-free boiler as it operates below atmospheric pressure). No license or inspection are required for operation.

Easy maintenance

Attaching the artificial intelligence D-Brain enables the easier operation and management. (Option)

Absolutely safe design

Unlike pressure boilers, the KDNV vacuum hot water boiler operates under negative pressure (pressure below atmospheric pressure) and has no risk of explosion. 4-level safety devices (Vacuum pressure, over heat prevention, boiler body thermistor and low water level switches) further ensures the reliability of the product.

Semi-permanent life

As the boiler water (heating medium water) of the vacuum hot water boiler is always kept in a fixed amount under vacuum condition without moving, there are no risks of corrosion or scale accumulation caused by dissolved oxygen. In addition with hygienic high corrosion resistant stainless steel heat exchangers, the boiler body is semi-permanent.

Multi-purpose heat exchangers

Heat exchangers can be used for heating, hot water supply and circulation heating in 1~3 circuits depending on the user’s demand. Each heat exchanger is independently installed and provides hygienic water without water mixing.

Low NOx Burner

Fuel cost can be saved by attaching a low NOx burner and 40ppm or less of NOx is guaranteed when operating under 4% of O2

Helium gas leak detector

Check any leakage after processing the boiler body → Check any leakage after assembling the heat exchanger→ Check any leakage after assembling the finished product
To produce vacuum boilers with perfect vacuum condition, a helium gas leak detector is used in 3 steps during production. By using helium detector at near perfect vacuum condition of 10-3 Torr ~ 10-7 Torr, the system automatically detects even the smallest gap or air leak from the welded part, where no fluid can normally leak through.

Standard specifications for vacuum hot water boiler KDNV series

Category		Unit	KDNV- 10	KDNV- 15	KDNV- 20	KDNV- 25	KDNV -30	KDNV- 35	KDNV- 40	KDNV- 45	KDNV- 50	KDNV- 60	KDNV- 80	KDNV-100	KDNV-120	KDNV-130	KDNV-150	KDNV-160	KDNV-200	KDNV-250	KDNV-300
Boiler specifications	Rated heat output	MW	0.12	0.17	0.23	0.29	0.35	0.41	0.47	0.52	0.58	0.70	0.93	1.16	1.40	1.51	1.74	1.86	2.33	2.91	3.49
	Rated heat output	kcal/h	100,000	150,000	200,000	250,000	300,000	350,000	400,000	450,000	500,000	600,000	800,000	1,000,000	1,200,000	1,300,000	1,500,000	1,600,000	2,000,000	2,500,000	3,000,000
	Efficiency	%	91% or more
	Heating area	㎡	5.43	5.85	8.28	8.28	10.09	10.09	12.04	12.04	18	18	20	22	22	24	28	28	36	38	42
	Control method	-	ON - OFF					HI - LOW - OFF
	Total power consumption	kW	0.3(0.25)	0.3(0.35)	0.47(0.47)	0.47(0.47)		0.84(0.84)			1.2(1.2)	1.6(1.2)	2.3(1.9)	2.3(3.1)			4.1(3.1)	4.1(7.6)	11(7.6)	15(7.6)	18.5(11.1)
	Power	V	220V x 1ø x 60Hz				380V x 3ø x 60Hz
	Retained heating medium water volume	L	200	220	300	330	390	400	470	480	500	550	650	700	750	790	830	900	1,300	1,600	1,900
Fuel consumption	LNG	N㎥/h	11.0	16.5	22.0	27.5	33.0	38.5	44.0	49.5	54.9	65.9	87.9	109.9	131.9	142.9	164.8	175.8	219.8	274.7	329.7
	Propane(LPG)		4.9	7.4	9.8	12.3	14.7	17.2	19.6	22.1	24.5	29.4	39.2	49.1	58.9	63.8	73.6	78.5	98.1	122.6	147.2
	Butane		3.7	5.6	7.5	9.3	11.2	13.0	14.9	16.8	18.6	22.4	29.8	37.3	44.7	48.4	55.9	59.6	74.5	93.1	111.8
	Diesel	kg/h	10.7	16.0	21.3	26.7	32.0	37.3	42.7	48.0	53.3	64.0	85.4	106.7	128.0	138.7	160.0	170.7	213.4	266.7	320.1
Connection diameter	Oil inlet	A	15	15	15	15	15	15	15	15	15	15	25	25	25	25	25	25	25	25	25
	Gas inlet	A	25	25	25	40	40	40	40	40	40	40	40	40	40	40	50	50	50	65	65
	Flue	ømm	200	200	200	200	250	250	250	250	300	300	350	350	350	400	400	400	500	550	600
Base size	Width(W)	mm	1,060	1,060	1,200	1,200	1,300	1,300	1,450	1,450	1,140	1,140	1,440	1,510	1,510	1,510	1,530	1,530	1,790	2,100	3,100
	Length(L)		1,060	1,060	1,200	1,200	1,300	1,300	1,450	1,450	2,500	2,730	2,260	2,260	2,260	2,260	2,560	2,560	2,870	3,400	3,800
	Height(H)		100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100
External size (Gas)	Width(W)	mm	860	860	1,000	1,000	1,100	1,100	1,250	1,250	1,140	1,140	1,440	1,510	1,510	1,510	1,530	1,530	1,890	2,000	2,180
	Length(L)		1,370	1,370	1,640	1,640	1,740	1,810	2,000	2,000	3,270	3,570	3,610	3,640	3,640	3,690	3,960	3,960	4,730	5,120	5,280
	Height(H)		1,640	1,640	1,870	1,870	1,900	1,900	1,920	1,920	1,570	1,570	2,170	2,340	2,340	2,340	2,530	2,530	2,580	2,720	2,860
External size (Diesel)	Width(W)	mm	860	860	1,000	1,000	1,100	1,100	1,250	1,250	1,140	1,140	1,440	1,510	1,510	1,510	1,530	1,530	1,890
	Length(L)		1,350	1,350	1,530	1,530	1,630	1,730	1,940	1,940	3,150	3,390	3,230	3,370	3,370	3,420	3,710	3,710	4,510
	Height(H)		1,640	1,640	1,870	1,870	1,900	1,900	1,920	1,920	1,570	1,570	2,170	2,340	2,340	2,340	2,530	2,530	2,580
Product weight		kg	500	520	700	720	870	900	1,100	1,150	1,250	1,900	2,750	3,320	3,500	3,820	4,250	4,500	5,200	5,650	6,800

The external size may vary depending on the control panel and burner specifications.
Specifications in ( ) are diesel boiler specifications.

For heating and hot water circulation (333K → 343K) {60℃ → 70℃}

Category		Unit	KDNV -10	KDNV -15	KDNV -20	KDNV -25	KDNV -30	KDNV -35	KDNV -40	KDNV -45	KDNV -50	KDNV -60	KDNV -80	KDNV -100	KDNV -120	KDNV -130	KDNV -150	KDNV -160	KDNV -200	KDNV -250	KDNV -300
For heating and hot water circulation	Rated heat output	MW	0.12	0.17	0.23	0.28	0.35	0.41	0.47	0.52	0.58	0.7	0.93	1.16	1.40	1.51	1.74	1.86	2.33	2.01	3.49
	Rated heat output	kcal/h	100,000	150,000	200,000	250,000	300,000	350,000	400,000	450,000	500,000	600,000	800,000	1,000,000	1,200,000	1,300,000	1,500,000	1,600,000	2,000,000	2,500,000	3,000,000
	Circulation volume	ℓ	10,000	15,000	20,000	25,000	30,000	35,000	40,000	45,000	50,000	60,000	80,000	100,000	120,000	130,000	150,000	160,000	200,000	250,000	300,000
	Maximum operating pressure	MPa{kgf/㎠}	1{10}
	Pressure loss	MPa{mH2O}	0.012{0.12}	0.017{0.17}		0.02{0.2}		0.018{0.18}		0.022{0.22}			0.03{0.3}	0.033{0.33}		0.022{0.22}	0.03{0.3}		0.033{0.33}	0.035{0.35}	0.04{0.4}
	Material	-	Stainless steel pipe
	Connection diameter	A	40	40	50	50	50	50	65	65	80	80	80	100	100	100	100	100	150	150	150

For hot water supply (298K → 338K) {25℃ → 65℃}

Category		Unit	KDNV -10	KDNV -15	KDNV -20	KDNV -25	KDNV -30	KDNV -35	KDNV -40	KDNV -45	KDNV -50	KDNV -60	KDNV -80	KDNV -100	KDNV -120	KDNV -130	KDNV -150	KDNV -160	KDNV -200	KDNV -250	KDNV -300
For hot water supply	Rated heat output	MW	0.12	0.17	0.23	0.28	0.35	0.41	0.47	0.52	0.58	0.7	0.93	1.16	1.40	1.51	1.74	1.86	2.33	2.01	3.49
	Rated heat output	kcal/h	100,000	150,000	200,000	250,000	300,000	350,000	400,000	450,000	500,000	600,000	800,000	1,000,000	1,200,000	1,300,000	1,500,000	1,600,000	2,000,000	2,500,000	3,000,000
	Circulation volume	ℓ	2,500	3,750	5,000	6,250	7,500	8,750	10,000	11,250	12,500	15,000	20,000	25,000	30,000	32,500	40,000	40,000	40,000	62,500	75,000
	Maximum operating pressure	MPa{kgf/㎠}	1{10}
	Pressure loss	MPa{mH2O}	0.06{0.06}	0.015{0.15}		0.018{0.18}		0.015{0.15}		0.02{0.2}			0.024{0.24}	0.033{0.33}		0.022{0.22}	0.03{0.3}		0.022{0.22}	0.035{0.35}	0.04{0.4}
	Material	-	Stainless steel pipe
	Connection diameter	A	40	40	40	40	40	40	50	50	50	50	65	65	65	65	80	80	80	100	100

For hot water supply (278K → 338K) {5℃ → 65℃}

Category		Unit	KDNV -10	KDNV -15	KDNV -20	KDNV -25	KDNV -30	KDNV -35	KDNV -40	KDNV -45	KDNV -50	KDNV -60	KDNV -80	KDNV -100	KDNV -120	KDNV -130	KDNV -150	KDNV -160	KDNV -200	KDNV -250	KDNV -300
For hot water supply	Rated heat output	MW	0.12	0.17	0.23	0.28	0.35	0.41	0.47	0.52	0.58	0.7	0.93	1.16	1.40	1.51	1.74	1.86	2.33	2.01	3.49
	Rated heat output	kcal/h	100,000	150,000	200,000	250,000	300,000	350,000	400,000	450,000	500,000	600,000	800,000	1,000,000	1,200,000	1,300,000	1,500,000	1,600,000	2,000,000	2,500,000	3,000,000
	Circulation volume	ℓ	1,667	2,500	3,333	4,167	5,000	5,833	6,667	7,500	8,333	10,000	13,333	16,667	20,000	21,667	25,000	26,667	33,333	41,667	50,000
	Maximum operating pressure	MPa{kgf/㎠}	1{10}
	Pressure loss	MPa{mH2O}	0.06{0.06}	0.015{0.15}		0.018{0.18}		0.015{0.15}		0.02{0.2}			0.024{0.24}	0.033{0.33}		0.022{0.22}	0.03{0.3}		0.022{0.22}	0.035{0.35}	0.04{0.4}
	Material	-	Stainless steel pipe
	Connection diameter	A	40	40	40	40	40	40	50	50	50	50	65	65	65	65	80	80	80	100	100

The above specification table is indicated as follows.
- The fuel calorific value of fuel consumption is based on the low-level calorific value.
- LNG : 10,000 kcal/N㎥
- LPG(Propane) : 22,400 kcal/N㎥
- LPG(Butane) : 29,500 kcal/N㎥
- Diesel:10,300 kcal/kg(gravity:0.836)
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 output for heating and hot water supply is given for each individual use, and in the case of simultaneous use, the total is the boiler heat output.
The following tolerances are included due to the measurement errors of the measuring instrument or measuring personnel.
- Boiler efficiency measurement error ±1%
The above boiler efficiency is based on the true heat generation (low heat generation).
The above specification table is subject to change without notice.
This specification is based on a gas boiler. For detailed specifications, refer to the specification table.