Abstract:
The present invention relates to bathing devices for special therapeutic or hygienic purposes such as e.g. sauna or Finnish baths, and especially to a steam generator element for a sauna electric heater and a sauna electric heater. A sauna electric heater ( 13 ) according to the present invention comprises comprising a frame part ( 14 ), heating resistor elements ( 15 - 17 ), ( 29 ), ( 30 ), ( 54 ), ( 55 ) inside the said frame part ( 14 ), and sauna stones ( 2 ) arranged inside the said frame part ( 14 ) and/or on the top part of the said sauna electric heater (13), which said sauna electric heater ( 13 ) comprises a steam generator element ( 18 ), ( 19 ), ( 26 ), ( 33 ), ( 37 ), ( 45 ), ( 52 ), ( 62 ) placed inside the said frame part ( 14 ) between at least two heating resistor elements ( 15 - 17 ), ( 29 ), ( 30 ), ( 54 ), ( 55 ) and/or said sauna stones ( 2 ), said steam generator element ( 18 ), ( 19 ), ( 26 ), ( 33 ), ( 37 ), ( 45 ), ( 52 ), ( 62 ) comprising a water tank ( 20 ), ( 27 ), ( 38 ), ( 46 ), ( 53 ) fillable with water. The sauna electric heater according to the present invention provides more durable operation and with less generated faults and brake ups when compared to the prior art solutions.

Description:
FIELD OF THE INVENTION 
       [0001]    The present invention relates to bathing devices for special therapeutic or hygienic purposes such as e.g. sauna or Finnish baths, and especially to a steam generator element for a sauna electric heater and a sauna electric heater. 
       BACKGROUND OF THE INVENTION 
       [0002]    Traditional sauna, also referred to as Finnish bath or a steam room, originated in Finland. There are two main types of traditional Finnish saunas, firstly saunas with wood burning sauna heaters and secondly saunas with sauna electric heaters. Both of these sauna heaters provide radiating heat to the sauna room and also heat up sauna stones in the top part of the said heater. A traditional way for generating sudden hot steam in a traditional sauna is to use a dipper to scoop water onto the hot sauna stones. 
         [0003]    The prior art will be described in the following in greater detail with reference to the accompanying figures, in which: 
         [0004]      FIG. 1  shows a perspective view of a sauna electric heater according to prior art; and 
         [0005]      FIG. 2  shows a block diagram of a sauna electric heater with a steam generator according to prior art. 
         [0006]      FIG. 1  shows a perspective view of a sauna electric heater according to prior art. The sauna electric heater according to prior art comprises a frame part  1  and a layer of stones  2  arranged on the top part of the said sauna electric heater. The sauna electric heater according to prior art also comprises heating resistor elements inside the said frame part  1 . The heating resistor elements provide radiating heat which radiating heat heats up the said layer of stones  2  arranged on the top part of the said sauna electric heater. 
         [0007]    The main use of a sauna electric heater is to release heat to direct heated sauna room temperature. When using sauna is typical fashion there is poured water onto the said layer of hot stones  2 . One traditional way is to use a dipper to scoop water onto the said layer of sauna stones  2 . The water evaporates from the said layer of stones  2 , this suddenly releasing a large amount of steam into the sauna room. 
         [0008]      FIG. 2  shows a block diagram of a sauna electric heater with a steam generator according to prior art. The presented sauna electric heater arrangement according to prior art has a sauna electric heater  3  being complemented with a steam generator element  4 , in which the steam generator element  4  is placed adjacent to the sauna electric heater  3 . The sauna electric heater  3  according to prior art comprises a frame part  5  and heating resistor elements  6 - 8  inside the said frame part  5 . The heating resistor elements  6 - 8  provide radiating heat which radiating heat heats up a layer of stones of the said sauna electric heater  3 . 
         [0009]    The steam generator element  4  according to prior art comprises a frame part  9  which frame part  9  is filled with water. The steam generator element  4  according to prior art also comprises a heating resistor element  10  inside the said frame part  9 . The steam generator element  4  according to prior art provides steam to the sauna by heating up the said heating resistor element  10  and thereby warming the water in the water filled frame part  9  of the steam generator element  4 . Consequently, the water evaporates and produces steam to the sauna. The steam generator element  4  complements the soothing heat of a traditional sauna electric heater  3  with an infusion of soft steam provided by the said steam generator element  4 . 
         [0010]    The steam generator element  4  of the presented sauna electric heater arrangement according to prior art also comprises a temperature measurement probe  11  in the water filled frame part  9  of the steam generator element  4 . Furthermore, the steam generator element  4  comprises a control block  12  for controlling the steam generation of the steam generator element  4 . The control block  12  of the steam generator element  4  is typically used for controlling the water level of the water filled frame part  9  as well as for emptying the frame part  9  from water. 
         [0011]    There are several problems with the prior art steam generators and with prior art sauna electric heaters having a steam generator. The current steam generator solutions are quite complex and the comprise a lot of electronical solutions in heating the water for providing steam as well as for controlling the water level of the water filled frame part as well as for emptying the frame part from water. 
         [0012]    The current steam generator solutions are easily generating faults and brake up quite easily usually due to lack of cleaning up and maintenance. Therefore, there is a need for a steam generator solution and for a sauna electric heater having a steam generator, which would be a simpler and more straight-forward solution, not prone to generating faults and braking up. 
         [0013]    The problem therefore is to find a design and configuration for a steam generator which can produce soft steam to the sauna and which also is simpler in design and which configuration are not prone to generating faults and braking up. 
         [0014]    There is a demand in the market for a steam generator, which steam generator can produce soft steam to the sauna while still providing more durable operation and with less generated faults and brake ups when compared to the prior art solutions. 
       BRIEF DESCRIPTION OF THE INVENTION 
       [0015]    An object of the present invention is thus to provide a method and an apparatus for implementing the method so as to overcome the above problems and to alleviate the above disadvantages. 
         [0016]    The objects of the invention are achieved by a steam generator element for a sauna electric heater, said sauna electric heater comprising a frame part, heating resistor elements inside the said frame part, and sauna stones arranged inside the said frame part and/or on the top part of the said sauna electric heater, which said steam generator element comprises a water tank fillable with water and being placeable inside the said frame part between at least two heating resistor elements and/or said sauna stones. 
         [0017]    Preferably, said water tank is manufactured from a metal sheet or from a metal alloy sheet with joined form pressed side plates. Preferably, said steam generator element comprises a water tank cover comprising openings. Preferably, said water tank cover is manufactured from a form pressed metal sheet or from a form pressed metal alloy sheet. 
         [0018]    Preferably, said water tank and/or the said water tank cover comprise one or more water level mark. Preferably, said water tank cover comprises a recess for a diffuser of oils or solutions. 
         [0019]    The objects of the invention are also achieved by a sauna electric heater comprising a frame part, heating resistor elements inside the said frame part, and sauna stones arranged inside the said frame part and/or on the top part of the said sauna electric heater, which said sauna electric heater comprises a steam generator element placed inside the said frame part between at least two heating resistor elements and/or said sauna stones, said steam generator element comprising a water tank fillable with water. 
         [0020]    Preferably, in said sauna electric heater said water tank and/or the said water tank cover comprise one or more water level mark. Preferably, said steam generator element comprises: a heat-proof pipe element connected to the bottom part of the said water tank; and/or a heat-proof hose comprising a transparent element and a water level mark. Preferably, said steam generator element comprises a heat-proof syphon pipe. 
         [0021]    Preferably, said sauna electric heater comprises: a control unit for regulating the water level of said water tank of said steam generator element, the said a control unit comprising a water inlet and a control block for controlling the said water inlet; and that it comprises a water inlet pipe/hose arrangement leading the water from the said water inlet to said heat-proof hose and/or said heat-proof pipe element. 
         [0022]    Further preferably, said sauna electric heater comprises at least two water level sensors, each water level sensor of the at least two water level sensors being arranged to detect a level of water in the water tank. Alternatively, said sauna electric heater comprises a movable water level sensor and a sensor pipe connected to one end of said heat-proof hose and/or to one end of said heat-proof pipe element, the movable water level sensor being arranged to move up and down along the said sensor pipe. 
         [0023]    Further preferably, said movable water level sensor detects when the water has risen to the level of a first water level mark showing the filling level of water in the water tank or to the level of a second water level mark showing the draining level of water in the water tank. Further preferably, said movable water level sensor detects when the water level is at a desirable level for regulating the amount of steam generated by the said steam generator element. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0024]      FIG. 1  shows a perspective view of a sauna electric heater according to prior art; 
           [0025]      FIG. 2  shows a block diagram of a sauna electric heater with a steam generator according to prior art; 
           [0026]      FIG. 3  shows a block diagram of a sauna electric heater with a steam generator according to the present invention; 
           [0027]      FIG. 4  shows a perspective view of one embodiment of a steam generator element for a sauna electric heater according to the present invention; 
           [0028]      FIG. 5  shows a top view of one embodiment of a water tank cover of a steam generator element according to the present invention; 
           [0029]      FIG. 6  shows one embodiment for filling up a water tank of a steam generator element for a sauna electric heater according to the present invention; 
           [0030]      FIG. 7  shows a perspective view of another embodiment of a steam generator element for a sauna electric heater according to the present invention; 
           [0031]      FIG. 8  shows a top view of another embodiment of a water tank cover of a steam generator element according to the present invention; 
           [0032]      FIG. 9  shows a perspective view of one embodiment of a sauna is electric heater according to the present invention; 
           [0033]      FIG. 10  shows a perspective view of another embodiment of a sauna electric heater according to the present invention without sauna stones; 
           [0034]      FIG. 11  shows another embodiment for filling up and emptying a water tank of a steam generator element for a sauna electric heater according to the present invention; 
           [0035]      FIG. 12  shows a perspective view of a third embodiment of a steam generator element for a sauna electric heater according to the present invention; 
           [0036]      FIG. 13  shows a perspective cut open view of a third embodiment of a steam generator element for a sauna electric heater according to the present invention; 
           [0037]      FIG. 14  shows a third embodiment for filling up and emptying a water tank of a steam generator element for a sauna electric heater according to the present invention; 
           [0038]      FIG. 15  shows an embodiment for regulating the water level of a water tank of a steam generator element for a sauna electric heater according to the present invention; 
           [0039]      FIG. 16  shows another embodiment for regulating the water level of a water tank of a steam generator element for a sauna electric heater according to the present invention. 
       
    
    
       [0040]      FIGS. 1 to 2  are presented above. Some embodiments of the invention will now be described in greater detail by means of some preferred embodiments, with reference to  FIGS. 3 to 16 . 
       DETAILED DESCRIPTION OF THE INVENTION 
       [0041]      FIG. 3  shows a block diagram of a sauna electric heater according to the present invention. The sauna electric heater  13  according to the present invention comprises a frame part  14  and heating resistor elements  15 - 17  inside the said frame part  14  and sauna stones arranged inside the said frame part  14  and/or on the top part of the said sauna electric heater. The sauna electric heater  13  according to the present invention also comprises a steam generator element  18 , which steam generator element  18  is placeable inside the said frame part  14  between at least two of the said heating resistor elements  15 - 17  and/or said sauna stones. The steam generator element  18  according to the present invention utilizes the heat generated and radiated by the heating resistor elements  15 - 17  of the sauna electric heater  13  in generating steam to the sauna. Consequently, the water evaporates and produces steam to the sauna. The steam generator element  18  complements the soothing heat of a sauna electric heater  13  with an infusion of soft steam provided by the said steam generator element  18 . 
         [0042]      FIG. 4  shows a perspective view of one embodiment of a steam generator element for a sauna electric heater according to the present invention. The steam generator element  19  according to the present invention comprises a water tank  20  Tillable with water. Said water tank  20  of the said steam generator element  19  is placeable inside the sauna electric heater frame part between at least two of the heating resistor elements and/or sauna stones of the said sauna electric heater. The steam generator element  19  according to the present invention utilizes the heat generated and radiated by the heating resistor elements of the sauna electric heater in generating steam from said water tank  20  to the sauna. Said water tank  20  may be manufactured from a metal sheet or from a metal alloy sheet with joined form pressed side plates. As presented in  FIG. 4  said water tank  20  may be manufactured from a bended metal sheet or from a bended metal alloy sheet with joined side plates, said bended metal sheet or said bended metal alloy sheet forming a front face and a back face of said water tank  20 . As presented in  FIG. 4  said bended metal sheet or said bended metal alloy sheet may be bended to a U-form. Said water tank  20  may have a holding capacity or 1.0 to 3.0 liters, preferably a holding capacity or 1.5 to 2.0 liters. The steam generator element  19  according to the present embodiment also comprises a water tank cover  21 . 
         [0043]      FIG. 5  shows a top view of one embodiment of a water tank cover of a steam generator element according to the present invention. The water tank cover  21  according to the present embodiment comprises openings  22 ,  23  for steam generated from the from the water tank to the sauna. The openings  22 ,  23  may be e.g. slot type openings  22 ,  23 . The water tank cover  21  according to the present embodiment also comprises one or more water level mark  24  for marking the level of water in the water tank. Furthermore, the water tank cover  21  according to the present embodiment comprises a recess  25  for a diffuser of oils or solutions such as e.g. essential oils, ethereal oils, aromatic oils or fragrances. Said water tank cover  21  may be manufactured from a form pressed metal sheet or from a form pressed metal alloy sheet. 
         [0044]      FIG. 6  shows one embodiment for filling up a water tank of a steam generator element for a sauna electric heater according to the present invention. The steam generator element  26  according to the present embodiment comprises a water tank  27  fillable with water and a water tank cover  28 . Said water tank  27  of the said steam generator element  26  is placeable inside the sauna electric heater frame part between at least two of the heating resistor elements  29 ,  30  of the said sauna electric heater. Said water tank  27  of the said steam generator element  26  is filled with water e.g. with a water jug  31 . 
         [0045]    The water tank cover  28  according to the present embodiment also comprises a water level mark  32  for marking the filling level of water in the water tank  27 . The steam generator element  26  according to the present embodiment utilizes the heat generated and radiated by the heating resistor elements  29 ,  30  of the sauna electric heater in generating steam from said water tank  27  to the sauna. The steam generator element  26  complements the soothing heat of a sauna electric heater with an infusion of soft steam provided by the said steam generator element  26 . 
         [0046]      FIG. 7  shows a perspective view of another embodiment of a steam generator element for a sauna electric heater according to the present invention. The steam generator element  33  according to the present another embodiment comprises a water tank  20  fillable with water. Said water tank  20  of the said steam generator element  33  is placeable inside the sauna electric heater frame part between at least two of the heating resistor elements and/or sauna stones of the said sauna electric heater. The steam generator element  33  according to the present another invention utilizes the heat generated and radiated by the heating resistor elements of the sauna electric heater in generating steam from said water tank  20  to the sauna. Said water tank  20  may be manufactured from a metal sheet or from a metal alloy sheet with joined form pressed side plates. The steam generator element  33  according to the present another embodiment also comprises a water tank cover  34 . 
         [0047]      FIG. 8  shows a top view of another embodiment of a water tank cover of a steam generator element according to the present invention. The water tank cover  34  according to the present another embodiment comprises openings  35 ,  36  for steam generated from the from the water tank  20  to the sauna. The openings  35 ,  36  may be e.g. hole type openings  35 ,  36 . Said water tank cover  34  may be manufactured from a form pressed metal sheet or from a form pressed metal alloy sheet, 
         [0048]      FIG. 9  shows a perspective view of one embodiment of a sauna electric heater according to the present invention. The sauna electric heater according to present embodiment comprises a frame part  14  and heating resistor elements inside the said frame part  14  and sauna stones  2  arranged inside the said frame part  14  and/or on the top part of the said sauna electric heater. 
         [0049]    The sauna electric heater according to the present embodiment also comprises a steam generator element  19 , which steam generator element  19  is placed inside the said frame part  14  between at least two of the said heating resistor elements and/or said sauna stones  2 . The said sauna stones  2  arranged on the top part of the said sauna electric heater may leave the steam generator element  19  visible. Alternatively, the said sauna stones  2  arranged on the top part of the said sauna electric heater cover the steam generator element  19  wholly or partially. The heating resistor elements provide radiating heat which radiating heat heats up the said sauna stones  2  arranged inside the said frame part  14  and/or on the top part of the said sauna electric heater. 
         [0050]    The main use of a sauna electric heater is to release heat to direct heated sauna room temperature. When using sauna is typical fashion there is poured water onto the said layer of hot stones  2 . One traditional way is to use a dipper to scoop water onto the said layer of sauna stones  2 . The water evaporates from the said layer of stones  2 , this suddenly releasing a large amount of steam into the sauna room. The steam generator element  19  according to the present invention utilizes the heat generated and radiated by the heating resistor elements of the sauna electric heater in generating steam to the sauna, Consequently, the water evaporates and produces steam to the sauna. The steam generator element  19  complements the soothing heat of a sauna electric heater with an infusion of soft steam provided by the said steam generator element  19 . 
         [0051]      FIG. 10  shows a perspective view of another embodiment of a sauna electric heater according to the present invention without sauna stones. The sauna electric heater according to present another embodiment comprises a frame part  14  and heating resistor elements inside the said frame part  14  and sauna stones arranged inside the said frame part  14  and/or on the top part of the said sauna electric heater. 
         [0052]    The sauna electric heater according to the present another embodiment also comprises a steam generator element  33 , which steam generator element  33  is placed inside the said frame part  14  between at least two of the said heating resistor elements and/or said sauna stones. In the  FIG. 10  sauna stones are not shown. The said sauna stones arranged on the top part of the said sauna electric heater may leave the steam generator element  33  visible. Alternatively, the said sauna stones arranged on the top part of the said sauna electric heater cover the steam generator element  33  wholly or partially. The heating resistor elements provide radiating heat which radiating heat heats up the said sauna stones arranged inside the said frame part  14  and/or on the top part of the said sauna electric heater. 
         [0053]      FIG. 11  shows another embodiment for filling up and emptying a water tank of a steam generator element for a sauna electric heater according to the present invention. The steam generator element  37  according to the present embodiment comprises a water tank  38  fillable with water. Said water tank  38  of the said steam generator element  37  is placeable inside the sauna electric heater frame part between at least two of the heating resistor elements of the said sauna electric heater. 
         [0054]    Said water tank  38  of the said steam generator element  37  according to the present another embodiment comprises a heat-proof pipe element  39 . In the present another embodiment the heat-proof pipe element  39  is connected from one end to the bottom part of the water tank  38  and has in the other end a heat-proof hose  40 . The said heat-proof hose  40  may also have a funnel  41  which said funnel facilitates the filling of the said water tank  38  of the said steam generator element  37  e.g. by pouring water into the said funnel  41  with a water jug  42 . The said heat-proof hose  40  may be attached to a mounting position next to said sauna electric heater. Furthermore, said heat-proof hose  40  may also comprise a transparent element  43  and a water level mark  44  for marking the filling level of water in the water tank  38 . Said water tank  38  of the said steam generator element  37  is filled with water e.g. with a water jug  42  as illustrated in the first part of  FIG. 11 . 
         [0055]    Said water tank  38  of the said steam generator element  37  according to the present another embodiment is emptied by detaching the said heatproof hose  40  from its mounting position and turning the said heat-proof hose  40  towards the floor to have the said water tank  38  drained empty as illustrated in the second part of  FIG. 11 . 
         [0056]      FIG. 12  shows a perspective view of a third embodiment of a steam generator element for a sauna electric heater according to the present invention. The steam generator element  45  according to the present invention comprises a water tank  46  fillable with water. Said water tank  46  of the said steam generator element  45  is placeable inside the sauna electric heater frame part between at least two of the heating resistor elements and/or sauna stones of the said sauna electric heater. The steam generator element  45  according to the present invention utilizes the heat generated and radiated by the heating resistor elements of the sauna electric heater in generating steam from said water tank  46  to the sauna. The steam generator element  45  according to the present embodiment also comprises a water tank cover  47 . The steam generator element  45  according to the present invention also comprises a heat-proof syphon pipe  48  which said syphon pipe  48  facilitates the emptying of the said water tank  46  of the said steam generator element  45 . 
         [0057]      FIG. 13  shows a perspective cut open view of a third embodiment of a steam generator element for a sauna electric heater according to the present invention. The steam generator element  45  according to the present invention comprises a water tank  46  fillable with water. Said water tank  46  of the said steam generator element  45  is placeable inside the sauna electric heater frame part between at least two of the heating resistor elements and/or sauna stones of the said sauna electric heater. The steam generator element  45  according to the present invention utilizes the heat generated and radiated by the heating resistor elements of the sauna electric heater in generating steam from said water tank  46  to the sauna. The steam generator element  45  according to the present embodiment also comprises a water tank cover  47 . The steam generator element  45  according to the present invention also comprises a heat-proof syphon pipe  48  which said syphon pipe  48  facilitates the emptying of the said water tank  46  of the said steam generator element  45 . 
         [0058]    The water tank  46  and/or the water tank cover  47  of the said steam generator element  45  according to the present embodiment also comprises one or more water level mark  49 ,  50  for marking the level of water in the water tank  46 . In the cut open view of a third embodiment as presented in the  FIG. 13  there is shown a first water level mark  49  showing the filling level of water in the water tank  46 . Respectively, in the cut open view of a third embodiment as presented in the  FIG. 13  there is shown a second water level mark  50  showing the emptying level of water in the water tank  46 . 
         [0059]      FIG. 14  shows a third embodiment for filling up and emptying a water tank of a steam generator element for a sauna electric heater according to the present invention. The steam generator element  45  according to the present third embodiment comprises a water tank  46  fillable with water. Said water tank  46  of the said steam generator element  45  is placeable inside the sauna electric heater frame part between at least two of the heating resistor elements of the said sauna electric heater. Said water tank  46  of the said steam generator element  45  according to the present third embodiment comprises a heat-proof syphon pipe  48 . 
         [0060]    The said steam generator element  45  according to the present embodiment also comprises one or more water level mark  49 ,  50  for marking the level of water in the water tank  46 . As illustrated in the first part of  FIG. 14  the said water tank  46  of the said steam generator element  45  may be filled with water e.g., with a water jug  51 . In the  FIG. 14  a first water level mark  49  shows the filling level of water in the water tank  46 . 
         [0061]    Respectively, as illustrated in the second part of  FIG. 14  the emptying of the said water tank  46  of the said steam generator element  45  is initiated by filling the said water tank  46  to the draining level e.g. with a water jug  51 . In the  FIG. 14  a second water level mark  50  shows the draining level of water in the water tank  46 . 
         [0062]    When the water is filled to the draining level marked by said second water level mark  50  the said syphon pipe  48  starts the process of emptying of the said water tank  46 . The syphon emptying process of the water tank  46  is illustrated in the third part of  FIG. 14 . 
         [0063]      FIG. 15  shows an embodiment for regulating the water level of a water tank of a steam generator element for a sauna electric heater according to the present invention. The steam generator element  52  according to the present embodiment comprises a water tank  53  fillable with water. Said water tank  53  of the said steam generator element  52  is placeable inside the sauna electric heater frame part between at least two of the heating resistor elements  54 ,  55  of the said sauna electric heater. Said water tank  53  of the said steam generator element  52  according to the present embodiment comprises a heatproof pipe element  39  and/or a heat-proof hose  40 . The said heat-proof hose  40  may also have a funnel  41 . The steam generator element  52  according to the present embodiment also comprises a heat-proof syphon pipe  48  which said syphon pipe  48  facilitates the emptying of the said water tank  53  of the said steam generator element  52 . 
         [0064]    Furthermore, the sauna electric heater according to the present embodiment comprises a control unit  56  for regulating the water level of said water tank  53  of said steam generator element  52 . The said a control unit  56  may comprise a water inlet  57  to said the sauna electric heater and a control block  58  for controlling the said water inlet  57 . The sauna electric heater according to the present embodiment also comprises a water inlet pipe/hose arrangement  59  leading the water from the said water inlet  57  to said heat-proof hose  40  and/or said heat-proof pipe element  39 . 
         [0065]    Furthermore, the sauna electric heater according to the present embodiment comprises at least two water level sensors  60 ,  61 , each water level sensor  60 ,  61  of the at least two water level sensors  60 ,  61  being arranged to detect a level of water in the water tank  53 . The said at least two water level sensors  60 ,  61  may e.g. be a capacitive sensors  60 ,  61 . 
         [0066]    When the water tank  53  is filled a first water level sensor  60  of the at least two water level sensors  60 ,  61  is activated. The said control block  58  of the said a control unit  56  controls the said water inlet  57  until the said first water level sensor  60  detects that the water has risen to a desirable level i.e. to the filling level. 
         [0067]    Respectively, when the emptying of the said water tank  53  is initiated a second water level sensor  61  of the at least two water level sensors  60 ,  61  is activated. The said control block  58  of the said a control unit  56  controls the said water inlet  57  until the said second water level sensor  61  detects that the water has risen to a desirable level i.e. to the draining level. When the water is filled to the draining level marked by said second water level mark  50  the said syphon pipe  48  starts the process of emptying of the said water tank  53 , 
         [0068]      FIG. 16  shows another embodiment for regulating the water level of a water tank of a steam generator element for a sauna electric heater according to the present invention. The steam generator element  62  according to the present another embodiment comprises a water tank  53  fillable with water. Said water tank  53  of the said steam generator element  62  is placeable inside the sauna electric heater frame part between at least two of the heating resistor elements  54 ,  55  of the said sauna electric heater. Said water tank  53  of the said steam generator element  62  according to the present another embodiment comprises a heat-proof pipe element  39  and/or a heat-proof hose  40 . The said heat-proof hose  40  may also have a funnel  41 . The steam generator element  62  according to the present another embodiment also comprises a heat-proof syphon pipe  48  which said syphon pipe  48  facilitates the emptying of the said water tank  53  of the said steam generator element  62 . 
         [0069]    Furthermore, the sauna electric heater according to the present another embodiment comprises a control unit  56  for regulating the water level of said water tank  53  of said steam generator element  62 . The said a control unit  56  may comprise a water inlet  57  to said the sauna electric heater and a control block  58  for controlling the said water inlet  57 . The sauna electric heater according to the present another embodiment also comprises a water inlet pipe/hose arrangement  59  leading the water from the said water inlet  57  to said heat-proof hose  40  and/or said heat-proof pipe element  39 . 
         [0070]    Furthermore, the sauna electric heater according to the present another embodiment comprises a movable water level sensor  63  and a sensor pipe  64 . The said sensor pipe  64  is connected to one end of said heat-proof hose  40  and/or to one end of said heat-proof pipe element  39 . The movable water level sensor  63  is arranged to move up and down along the said sensor pipe  64 . The said movable water level sensor  63  may e.g. be a capacitive sensor  63 . 
         [0071]    When the water tank  53  is filled the said movable water level sensor  63  is moved to the level of a first water level mark  49  showing the filling level of water in the water tank  53 . The said control block  58  of the said a control unit  56  controls the said water inlet  57  until the said movable water level sensor  63  detects that the water has risen to a desirable level i.e. to the filling level. 
         [0072]    Respectively, when the emptying of the said water tank  53  is initiated the said movable water level sensor  63  is moved to the level of a second water level mark  50  shows the draining level of water in the water tank  53 . The said control block  58  of the said a control unit  56  controls the said water inlet  57  until the said movable water level sensor  63  detects that the water has risen to a desirable level i.e. to the draining level. When the water is filled to the draining level marked by said second water level mark  50  the said syphon pipe  48  starts the process of emptying of the said water tank  53 . 
         [0073]    Furthermore, the said control unit  56  of the sauna electric heater according to the present another embodiment may be used to regulate the amount of steam generated by the said steam generator element  62  by regulating the water level of the said water tank  53  of the said steam generator element  62 . When regulating the water level of the said water tank  53 , the said movable water level sensor  63  is moved to a desired level lower than said first water level mark  49  showing the filling level of water in the water tank  53 . The less steam is desired the lower the water level sensor  63  is moved. The said control block  58  of the said a control unit  56  controls the said water inlet  57  until the said movable water level sensor  63  detects that the water level is at a desirable level. The said control unit  56  may utilize sensors, e.g. temperature sensors and humidity sensors in regulating the amount of steam generated by the said steam generator element  62 . 
         [0074]    The current steam generator solution according to the present invention can produce soft steam to the sauna and also is simpler in design and has a configuration which is not prone to generating faults and braking up. The current steam generator solution according to the present invention provides more durable operation and with less generated faults and brake ups when compared to the prior art solutions. The water tank according to the present invention may have a holding capacity or  1 . 0  to  3 . 0  liters, preferably a holding capacity or  1 , 5  to  2 . 0  liters. The steam generator solution according to the present invention can produce steam  12  to  15  minutes from the start. The steam generator solution according to the present invention can produce steam to the sauna up to  75 % RH (RH, Relative Humidity) after the first  30  minutes. The steam generator solution according to the present invention can produce steam for  60  to  90  minutes without a need for a refill of water. 
         [0075]    Also the sauna electric heater according to the present invention has a steam generator which can produce soft steam to the sauna and also is simpler in design and has a configuration which is not prone to generating faults and braking up. The sauna electric heater according to the present invention provides more durable operation and with less generated faults and brake ups when compared to the prior art solutions. 
         [0076]    The solution according to the present invention may be utilized in any kind of sauna solutions having a sauna electric heater. The solution according to the present invention may even be installed to old sauna premises and also even to sauna premises having an old sauna electric heater. 
         [0077]    It will be obvious to a person skilled in the art that, as the technology advances, the inventive concept can be implemented in various ways. The invention and its embodiments are not limited to the examples described above but may vary within the scope of the claims.