5 In the case of a heater having a directly-heated heat  exchanger for a bath heater, when an empty-heating prevention  test as specified in the General Rules for JIS Tests 19.2 is  conducted in a JIS Laboratory, the results meet the following  conditions.  (1) Ignition is not possible unless there is water in the heat  exchanger for a bath heater.  (2) When water decreases after it has been supplied into the  heat exchanger for a bath heater, the fire is extinguished within  10 seconds after the water level reaches the lower edge of the  lower circulation tube (the bathtub side). In addition, even if  water is supplied into the bathtub and fire is reignited  immediately after the fire has been extinguished, no flame is  produced outside the water heater nor does the water heater  break.  6 When a vibration test as specified in the General Rules for JIS  Tests 29.1 and 29.3 is conducted in a JIS Laboratory, and the  heater is vibrated at 170 centimeters per second per second with  each of the frequencies of 0.3 seconds, 0.5 seconds, and 0.7  seconds, the fire is extinguished within 10 seconds, and no  abnormal combustion occurs before the fire is extinguished.  7 When a flame failure protection test as specified in the  General Rules for JIS Tests 52. is conducted in a JIS  Laboratory, and the supply of heating oil is resumed, the heater  does not automatically resume combustion.  8 (1) The heater indicates the name of the Notifying Enterprise  in such a manner whereby it does not fade easily; provided,  however, that an abbreviated name or a mark for which the  approval of the Minister of Economy, Trade and Industry has  been obtained or a Registered Trademark which has been  notified to the Minister of Economy, Trade and Industry may be  indicated in lieu of the name of the Notifying Enterprise.  (2) Precautions for use that will be necessary for ensuring safe  use are appropriately indicated in such a manner whereby it  does not fade easily.  8. Oil-fired  Bathtub  Water  Heaters  1 The measurement value taken by the CO/CO2 Measuring  Method for Oil-fired Water Heaters in a JIS Laboratory is no  more than 0.01.  2 When a temperature rise test is conducted for each part as  specified in the General Rules for JIS Tests 6.1 and 6.2 f) and i)  in a JIS Laboratory, the results meet the following conditions.  (1) The difference between the room temperature and the  surface temperature of the wooden stand below and around the  heater is no more than 65 degrees.  (2) The difference between the room temperature and the  surface temperature of the wooden walls above, at the sides  (including at the back), and in front of the heater is no more  than 65 degrees.  (3) The difference between the room temperature and the oil  temperature is no more than 25 degrees.  38 