Solar water heater

Abstract

A solar water heater including an outer housing and a heat absorbing water tank fixed onto the interior surface of the outer housing. The heat absorbing water tank may have a water entrance and a water exit. A heat insulating layer may be filled underneath the heat absorbing water tank between the heat absorbing water tank and the outer housing, and a transparent heat insulating board may be placed on top of the heat absorbing water tank. The heat absorbing water tank may have web system formed by tubules, or may be in a rectangular shape with reinforced concaves. The heat absorbing water tank may be manufactured by using plastic materials.

1 . A solar water heater, comprising:
 an outer housing; and   a heat absorbing water tank fixed onto the interior surface of the outer housing, wherein the heat absorbing water tank has a water entrance and a water exit;   wherein:   a heat insulating layer is filled underneath the heat absorbing water tank between the heat absorbing water tank and the outer housing; and   a transparent heat insulating board is placed on top of the heat absorbing water tank.   
     
     
         2 . The solar water heater of  claim 1 , wherein:
 the heating absorbing water tank has a plurality of transverse tubules placed in parallel with each other; and   a plurality of longitudinal tubules placed in parallel with each other;   wherein the heating absorbing water tank, wherein:
 the plurality of transverse tubules and the plurality of longitudinal tubules are placed coplanarly and are inter-connected; and 
 there are ribs connecting outer walls of adjacent plurality of transverse tubules or outer walls of adjacent plurality of longitudinal tubules. 
   
     
     
         3 . The solar water heater of  claim 1 , wherein:
 the heat absorbing water tank is a rectangular heat absorbing water tank, wherein the rectangular heat absorbing water tank, wherein:   a top surface of the rectangular heat absorbing water tank has a plurality of rectangular pyramid shape convexes;   a bottom surface of the rectangular heat absorbing water tank has a plurality of conical concaves; and   an apexes of the conical concaves reach and become part of the top surface of the rectangular heat absorbing water tank.   
     
     
         4 . The solar water heater of  claim 2 , wherein:
 the plurality of transverse tubules and the plurality of longitudinal tubules are circular tubules having circular shape cross sections;   at least either the plurality of transverse tubules or the plurality of longitudinal tubules have a wave axis line; and   the plurality of transverse tubules and the plurality of longitudinal tubules intersect at a wave crest or a wave trough of the wave axis line.   
     
     
         5 . The solar water heater of  claim 2 , wherein:
 the plurality of transverse tubules and the plurality of longitudinal tubules are circular tubules having circular shape cross sections; and   the plurality of transverse tubules and the plurality of longitudinal tubules are both straight tubules.   
     
     
         6 . The solar water heater of  claim 1 , wherein:
 a water storing water tank is placed on top of the heat absorbing water tank;   the water exit of the heat absorbing water tank is connected to the water storing water tank;   the water entrance of the heat absorbing water tank is connected to the water storing water tank via a return water pipe; and   two valves are placed at the water entrance of the heat absorbing water tank.   
     
     
         7 . The solar water heater of  claim 1 , wherein:
 a water storing water tank and an electric heating chamber are embedded in the heat insulating layer filled underneath the heat absorbing water tank, where the two ends of the water storing water tank are connected to the water entrance and water exit of the hear absorbing water tank via connecting tubes; and   the electric heating chamber is placed in series between the water storing water tank and the connecting tubes connecting to the water entrance, wherein the electric heating chamber has an electric heater inside of it.   
     
     
         8 . The solar water heater of  claim 1 , wherein:
 the heat absorbing water tank has a caecal tube wherein the caecal tube has a closed top, and the bottom of the caecal tube is connected to a core space within the heat absorbing water tank via a connector.   
     
     
         9 . The solar water heater of  claim 7 , wherein:
 the water storing water tank has a caecal tube, wherein the caecal tube has a closed top, and the bottom of the caecal tube is connected to a core space within the water storing water tank via a connector.