Ondol is a traditional Korean house heating method. It is also called Banggudeul. Heating method is make a fire at the fuel hole, and heating is done when hot smoke contained heat which was generated at the fuel hole passes through the Gudeuljang(room floor), and the said smoke is gone out into the chimney at the end of the Gudeuljang. A typical device of similar concept with Ondol is Hypocaust which is a Roman era's large bathhouse warm water supply method of primitive type (only comprised of fuel hole and Gorae) that Bulmok(the warmest part of the heated floor) or Gaejari is none. Furthermore we can also take a Gloria which was used for heating device of medieval castle that was derived from Hypocaust.

1. What is Ondol?

2. Ondol is a traditional Korean house heating method. Korean Ondol is also called Banggudeul.Ondol Heating
method is make a fire at the fuel hole, and heating is done when hot smoke contained heat which was
generated at the fuel hole passes through the Gudeuljang(room floor), and the said smoke is gone out into
the chimney at the end of the Gudeuljang. A typical device of similar concept with Ondol is Hypocaust
which is a Roman era's large bathhouse warm water supply method of primitive type (only comprised of
fuel hole and Gorae)that Bulmok(the warmest part of the heated floor) or Gaejari is none. Furthermore we
can also take a Gloria which was used for heating device of medieval castle that was derived from
Hypocaust.
Ondol Summary…

3. Ondol Design Structure
Ondol design structure has a slight difference depending on the era and region. If make Ondol
meeting with the most basic requirement only, its structure is make a fire at the fuel hole and heat
of that fuel hole is gone out into the chimney passing through the Gorae of the Gudeuljang.
Sequence to pass by the smoke which contained the heat of fire is as follows.
 Fuel hole - (Bulmok)
 (Gudeulgaejari) - Gudeulgorae - Goraegaejari
 (chimney gaejari) - chimney

4. Ondol Design Structure

5. Ondol Merits and Demerits
Hearth of West and Irori of Japan and so on are the heating apparatus directly using the heat source,
while Korean Ondol has a feature that use the generated 'indirect radiant heat' warming up the
Gudeuljang and Gorae under the Gudeuljang by the heat. That's why if a certain Gudeuljang was well
made, heat of the Gudeuljang relatively keeps up for long time even if got rid of the direct heat source
from the fuel hole. Condition of the good Gudeuljang depends on how long this 'remaining warmth'
would be lasting.
Demerit is that once Gudeul(room floor) is split or broken, smoke comes up and carbon monoxide
poisoning could be happened. As problem of the heat efficiency can be taken, it tends to heat
excessively beyond necessity to pass overnight with the remaining warmth after making a fire before
sleeping. Another demerit is that temperature difference between the place on the Ondol floor
nearest the fireplace and the upper side of the floor away from the fireplace is occurred under the
structure of Ondol.

6. Features and Benefits
 Surface is even, making it easy to choose from finishing materials
 Can be operated conveniently due to its automatic temperature control
 Heating without pollution and noise.
 Quick heating time
 Permanent durability
 Low maintenance costs
 No need to worry about damage due to a cold weather
 No boiler is required

7. Features and Benefits
 No risks of fires and explosion
 Can be installed at a highly humid area
 No need to worry about electromagnetic waves (Passed the standard for the range of of 2mG/OmG
for developed countries)
 While TOO standard in Sweden stipulates the standard to be within 2mG in the 30cm distance,our
heating cable meets the standard, measurement of 2mG even when measured closely without
distance in between due to the characteristics of the cable.
 Easy to install as the power can be supplied from one side.

8. Follow us:
Ondol/Heat
Ondol is a traditional Korean house heating method. It is also called Banggudeul. Heating method is
make a fire at the fuel hole, and heating is done when hot smoke contained heat which was
generated at the fuel hole passes through the Gudeuljang(room floor), and the said smoke is gone
out into the chimney at the end of the Gudeuljang. A typical device of similar concept with Ondol is
Hypocaust which is a Roman era's large bathhouse warm water supply method of primitive type
(only comprised of fuel hole and Gorae) that Bulmok(the warmest part of the heated floor) or
Gaejari is none. Furthermore we can also take a Gloria which was used for heating device of
medieval castle that was derived from Hypocaust.
For more details, Visit http://www.rexva.co.kr/eng/