Pressureless hot water boiler
KDNH series in the small capacity type, KDNH series in the large capacity type
KDNH series in the small capacity type
KDNH series in the large capacity type
Operating principle and features
- The boiler body structure is designed with a 3-pass inverted combustion method that adopts a special spiral flue and operates at 95℃ or less in a pressure-free condition where the expansion tank is directly attached. It is a boiler where no license and/or inspection are required as the boiler body pressure never exceeds atmospheric pressure and is absolutely safe from explosion. 4-level safety devices of temperature control switch, water level controller, overheat prevention switch and overflow line further ensures the safety of the boiler.
Features
- Indirectly heated stainless heat exchanger provides hygienic hot water without any scale and rust accumulation.
- Up to 3 circuits of heat exchangers for heating, hot water supply and heating can be installed in one boiler body.
- As the heat exchanger, hot water heater, water pump, and condensate tank required for steam boiler installation can be omitted, installation space, initial investment, electricity and labor costs can be greatly saved.
- As the boiler water is dissolved oxygen free soft water and is heated at a low temperature of 95℃ or less, the heat exchanger do not experience scale adherence and exhibit high efficiency
- It is a high-performance, high-efficiency boiler that combines the latest European technology and Dongkwang's know-how with the technology provided by Naval, Italy.
- The artificial intelligence D-Brain control enables easier operation and management. (Option)
- Attaching a low-NOx burner ensures fuel cost saving, and NOx of 40 ppm or less is guaranteed for operation under 4% of O₂. (Option)
- You can drastically reduce fuel costs by attaching a condensing economizer to the flue. (Option)
Standard specifications for pressure-free pipe water type of hot water boiler KDNH series
| Category | Unit | KDNH-10 | KDNH-15 | KDNH-20 | KDNH-25 | KDNH-30 | KDNH-35 | KDNH-40 | KDNH-45 | KDNH-50 | KDNH-60 | KDNH-80 | KDNH-100 | KDNH-120 | KDNH-130 | KDNH-150 | KDNH-160 | KDNH-200 | KDNH-250 | KDNH-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 |
| 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 | 12 | 13 | 15.1 | 16.9 | 18 | 21.7 | 21.7 | 25.3 | 25.3 | 29.6 | 38 | 42 | |
| Control method | - | ON - OFF | HI - LOW - OFF | ||||||||||||||||||
| Total power consumption | kW | (0.29) | (0.34) | 0.51(0.51) | 0.51(0.69) | 0.88(0.69) | 0.88(0.88) | 1.5(1.5) | 2.7(3.5) | 4.5(3.5) | 4.5(8.0) | 6.0(8.0) | 6.0(11.5) | ||||||||
| Blower power consumption | kW | (0.15) | (0.20) | 0.37(0.51) | 0.37(0.55) | 0.74(0.55) | 0.74(0.74) | 1.1(1.1) | 2.2(3.0) | 4.0(3.0) | 4.0(7.5) | 5.5(7.5) | 5.5(11.0) | ||||||||
| Circulation pump power consumption | kW | 0.04 | 0.4 | ||||||||||||||||||
| Power | V | 220V x 1ø x 60Hz | 380V x 3ø x 60Hz | ||||||||||||||||||
| Fuel consumption | LNG | N㎥/h | - | - | 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) | .- | - | 9.8 | 12.3 | 14.7 | 17.2 | 19.6 | 22.1 | 24.5 | 27.6 | 36.9 | 46.1 | 57.0 | 61.8 | 71.3 | 76.1 | 95.1 | 118.8 | 142.6 | ||
| Butane | - | - | 7.5 | 9.3 | 11.2 | 13.0 | 14.9 | 16.8 | 18.6 | 21.0 | 28.0 | 34.9 | 41.9 | 45.4 | 52.4 | 55.9 | 69.9 | 87.4 | 104.8 | ||
| Diesel | kg/h | 10.6 | 16 | 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 | - | - | 25 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 50 | 50 | 50 | 65 | 65 | ||
| Flue | ø | 200 | 200 | 200 | 200 | 250 | 250 | 250 | 250 | 300 | 300 | 350 | 350 | 400 | 400 | 400 | 400 | 450 | 550 | 600 | |
| Base size | Width(W) | mm | 1,060 | 1,060 | 1,200 | 1,200 | 1,300 | 1,300 | 1,450 | 1,450 | 1,410 | 1,410 | 1,570 | 1,570 | 1,610 | 1,610 | 1,610 | 1,610 | 1,650 | 1,700 | 1,900 |
| Length(L) | 1,060 | 1,060 | 1,200 | 1,200 | 1,300 | 1,300 | 1,450 | 1,450 | 2,530 | 2,670 | 2,810 | 2,970 | 3,110 | 3,110 | 3,270 | 3,270 | 3,560 | 3,560 | 4,200 | ||
| Height(H) | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | ||
| External size | Width(W) | mm | 1,060 | 1,060 | 1,000 | 1,000 | 1,100 | 1,100 | 1,250 | 1,250 | 1,510 | 1,510 | 1,670 | 1,670 | 1,710 | 1,710 | 1,710 | 1,710 | 1,750 | 2,000 | 2,200 |
| Length(L) | 1,450 | 1,450 | 1,740 | 1,740 | 1,870 | 1,870 | 2,110 | 2,110 | 3,530 | 3,670 | 4,140 | 4,300 | 4,490 | 4,490 | 4,650 | 4,650 | 4,980 | 4,980 | 5,200 | ||
| Height(H) | 2,340 | 2,340 | 2,500 | 2,500 | 2,550 | 2,550 | 2,560 | 2,560 | 2,130 | 2,130 | 2,340 | 2,340 | 2,440 | 2,440 | 2,440 | 2,440 | 2,540 | 2,750 | 3,250 | ||
| Product weight | kg | 550 | 570 | 750 | 770 | 920 | 950 | 1,150 | 1,200 | 13,500 | 2,000 | 2,850 | 3,420 | 3,600 | 3,900 | 4,350 | 4,600 | 5,300 | 5,750 | 6,950 | |
- 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 {60℃ → 70℃}
| Category | Unit | KDNH -10 |
KDNH -15 |
KDNH -20 |
KDNH -25 |
KDNH -30 |
KDNH -35 |
KDNH -40 |
KDNH -45 |
KDNH -50 |
KDNH -60 |
KDNH -80 |
KDNH -100 |
KDNH -120 |
KDNH -130 |
KDNH -150 |
KDNH -160 |
KDNH -200 |
KDNH -250 |
KDNH -300 |
|
| 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 | 0.7 | 0.93 | 1.16 | 1.40 | 1.51 | 1.74 | 1.86 | 2.33 | 2.01 | 3.49 |
| 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} | 0.03{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 | 65 | 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 heating and 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 |
| 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 | 7,500 | 8,750 | 10,000 | 11,250 | 12,500 | 15,000 | 20,000 | 25,000 | 30,000 | 32,500 | 37,500 | 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 | KDNH -10 |
KDNH -15 |
KDNH -20 |
KDNH -25 |
KDNH -30 |
KDNH -35 |
KDNH -40 |
KDNH -45 |
KDNH -50 |
KDNH -60 |
KDNH -80 |
KDNH -100 |
KDNH -120 |
KDNH -130 |
KDNH -150 |
KDNH -160 |
KDNH -200 |
KDNH -250 |
KDNH -300 |
|
| 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 | 0.7 | 0.93 | 1.16 | 1.40 | 1.51 | 1.74 | 1.86 | 2.33 | 2.01 | 3.49 |
| 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} | 0.006{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} | 0.035{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㎥
- 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.