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== Solar Water heating ==
 * 2018 Option to use PV directly connected to Geyser.
   * '''1.16Wh to heat one litre of water by one-degree celsius'''
   * liters x deltaT 4/3412 = kWh,  
     * e.g.1. 120l * (70-20) * 4/3412 = 1406.8kWh
     * e.g.2. 200l x 1C      x 4/3412 = 0.2345kWh
     * or  1kWh/(4/3412), heats 853l 1C
     * or  1kWh/(60c*4/3412), heats 14l 60C
 * Two main types, flat-pannel or vacuum tube, both can be gravity or forced.
      * Comparison between the two [[attach6ent:ITS-SOLAR-flat-plate-vs-evacuated-tube1.pdf]]
      * Explanation of how the vacuum tube works [[attachment:ITS-SOLAR-how-does-an-ethp-solar-collector-work4.pdf]]
      * [[attachment:RoboHeat(LST).pdf]] - !RoboHeat - Heat pump


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