Water heater

Abstract

A water heat includes a case having an airtight chamber therein, a water pipe received in the chamber of the case with a first connection end and a second connection end extended out of the case respectively, a thermal medium, which is liquid in a room temperature, received in the chamber of the case, and a heating device for heating the thermal medium directly or indirectly.

1 . A water heat, comprising:
 a case having an airtight chamber therein;   a water pipe received in the chamber of the case with a first connection end and a second connection end extended out of the case respectively;   a thermal medium, which is liquid in a room temperature, received in the chamber of the case; and   a heating device for heating the thermal medium directly or indirectly.   
   
   
       2 . The water heater as defined in  claim 1 , wherein a pressure in the chamber is lower than one atmospheric pressure. 
   
   
       3 . The water heater as defined in  claim 2 , wherein the chamber of the case is vacuumed. 
   
   
       4 . The water heater as defined in  claim 2 , wherein the pressure in the chamber  30  is less than 10 −2  Torr. 
   
   
       5 . The water heater as defined in  claim 1 , wherein the water pipe has a continuous S shape, and the second connection end is higher than the first connection end. 
   
   
       6 . The water heater as defined in  claim 1 , wherein the heating device is a burner mounted on a bottom of the case. 
   
   
       7 . The water heater as defined in  claim 6 , wherein the heating device is a gas burner. 
   
   
       8 . The water heater as defined in  claim 1 , wherein the heating device is an electric heater mounted on a bottom of the case. 
   
   
       9 . The water heater as defined in  claim 1 , wherein the heating device is an electric heater mounted on a bottom of the chamber. 
   
   
       10 . The water heater as defined in  claim 1 , wherein the thermal medium takes 1.5% to 20% of a volume of the chamber. 
   
   
       11 . The water heater as defined in  claim 1 , wherein the thermal medium is made of a material with a high volatility selected from a group consisting of ether, alcohol, benzene. 
   
   
       12 . The water heater as defined in  claim 1 , further comprising a thermal isolation layer surrounding the case. 
   
   
       13 . The water heater as defined in  claim 1 , further comprising an outer case enclosing the case therein. 
   
   
       14 . The water heater as defined in  claim 13 , wherein a vacuum thermal isolation layer is provided between the out case and the case. 
   
   
       15 . The water heater as defined in  claim 13 , wherein a thermal isolation layer is provided between the out case and the case.