Commercial Boiler (8Kw~30Kw)
Specific to Dry Heating / Large-capacity
Hien Instant Electric Boiler
Based on RAONIS’s Differentiated Technical Prowess
Long-lasting Warmth
TCM heaters can be used semi-permanently without any corrosion.
Hien boilers use the instant heating method without requiring a heat storage tank,
and demonstrates excellent heat resistance and corrosion resistance.
Supply of clean, hygienic
and prompt hot water at all times
The instant heating method operated through
a semi-conductor type transparent glass heating element supplies
clean and hygienic hot water at all times without any rusty water.
A prompt and quiet Hien boiler!
A heating system that enhances financial advantages as it is used more
The PI(proportion) temperature control system promptly reaches the preferred temperature.
This product actualizes pleasant warmth in a small space, and the combination between
the canned pump method and the SSR control(non-contact relay) method prevents
rotation noise and enables quite operation.
electricity cost reduced by up to 40% compared to kerosene and LPG gas
Since the low maintenance cost increases use efficiency and extends heating, it enables fuel saving.
Economic Feasibility of Instant Electric Boiler
* Based on an oil consumption of 20K, on a gas consumption of 20,000kacl/h, on an electricity consumption of 24k, and on the hourly fee rate applied to April 2018(kerosene: 907.48/L, LPG: 1,845.06/kg, based on general-purpose electricity high-pressure C light loading: 53.7won/Wh)
Heating cost reduced by up to 40%
In comparison to heating products that use kerosene and LPG gas, the heating cost can be reduced by 30%~40%.
Multiple safety devices for precious people
Its outstanding safety design consisting of smart auto control,
earth leakage breaker, overheating safety sensor, vibration sensor,
water level sensor, anti-sticking function, anti-freeze function, etc.
protects your precious family’s safety and property.
A temperature controller that is easy
and convenient to use
RAONIS Indoor Temperature Controller RA-10 Series
  • Convenient Use, Easy Controller Design
  • Usable at Night, Backlight Screen
  • 1℃-unit Temperature Control
  • 12-hour Cycle Repeat Setting
  • Outing Function
Because RAONIS has confidence
in its products, RAONIS is capable.
“10-year Warranty on TCM Heater”
Customer Service Taking Responsibility to the Last
RAONIS provides a year-round call-in help service.
[Standard Specifications]
Product Name

Hien Instant Electric Boiler
Division

NX - RHA08

NX - RHA012

NX -RHA015

NX - RHA018

NX -  RHA020

NX - RHA025

Power Consumption ( KW/h)

 8 12 15 18 20

25

Calorie(Kcal)

 6,880 10,320 12,900 15,480 17,200 21,500

Heating area(㎡/PY)

 56/19 82/27 103/33 121/39 135/43 168/53
Inlet Water Temperature

Based on 10℃

Outlet Water Temperature ΔT=35℃

Based on 45℃

Hot Water Supply ( L/min )

 X 4.9 6.1 7.3 8.1 10.2

Hot Water Supply ( L/h )

 X 294 366 438 486 612

No. of Shower Heads Used

 X
Intended Use For Heating Only

For Both Heating and Hot Water

Connected Pipe(A)

Heating : 20(PT3/4)

Heating : 20A(PT3/4)  Hot Water : 15A(PT1/2)
Water Pressure Applied

0.03Mpa ~ 0.6Mpa

Heater Power

3-phase 380V 50Hz ~ 60Hz

Control Power

Single-phase 220V 50Hz ~ 60Hz

Hot Water Maximum Pressure (Kgf/㎠(kPa)

0.3~0.8(29.4 ~ 787.84)
Product Size(mm)

W520 x H730 x D250

Installation Type

Wall-mountable
* The heating area’s standard specifications may vary depending on the country, place of installation and environment.
Recommended Place of Installation


Green living facility
study room, sports center, karaoke room, restaurant, office, etc.


hospital/health care facility
health care hospital, post-natal care center, hospital room, office, etc.


Military unit / night duty room
dormitory, night duty room, barracks room, etc.


Religious/educational facility
Buddhist temple, prayer house, kindergarten, daycare center, nursery facility, nursing home, etc.


Lodging facility
motel, pension, training institute, etc.