Depending on the living styles, the types of energy consumed by households have changed, and the consumption has increased rapidly.
Consequently, those have led to environmental issues, such as exhaustion of energy and the climate changes. As one of solutions to such issues, energy efficiency can be approached. Therefore, in this study, the gas water heater(115S type Rheem products) that made in Germany and obtain hot water using gas as a heat source is selected. a 1.0㎥ water tank with a 6kW electronic heater is installed and a water temperature and pressure is maintain constantly also thermometer is injected. Two of gas meter, one of pressure regulator and three of time measurement devices are installed in a combustion facility and fuelling facility with a magnet valve so it can observe and record combustion reactions. Quantity of hot water that heated by boiler is recorded using a quantity measurement tank, and have been heated by the boiler have been to record and measure the amount and utilized the data acquired through measurement of all factors that are applied to acquire hot water in order to calculate the use rate of final energy. In conclusion, this researcher drew the economic strong points of the hot water generated by gas.Key

Abstract
 1. 서 론
 2. 연구대상 및 방법
  2.1 연구대상
  2.2 연구방법
 3. 결과 및 고찰
 4. 결 론
 ５. References

• 김성중(인천대학교 안전공학과) | Seong Jung Kim Corresponding Author
• 우인성(인천대학교 안전공학과) | In sung Woo