Apparatus and devices for water supply and for heating and warming water, namely, heat pumps, water heaters, water treatment equipment in the nature of water filtration units and water purification units, water distribution units in the nature of electric water dispensers and water purifiers, diffusers for air diffusion into water for use in aquaculture, dewatering units for use in the treatment of liquids including water, and water filters for use in aquaculture; installations for heating an...