according to the present invention there is provided a compact heat pump using water as refrigerant , comprising an evaporator located at a first end section of the heat pump casing , adapted to allow evaporation of water therefrom , one or more compressors located at a second end section of the heat pump casing adapted to induce said evaporation by maintaining vacuum , provided with an intake conduit extending from the evaporator to the compressor leading vapor thereto . a condenser is located in the intermediate section of the casing wherein the intake conduit passes therethrough , adapted for condensing the vapor . the heat pump also comprises vacuum means allowing creating and maintaining vacuum in the casing . there is also provided a snow dome allowing skiing and snow related activities in above zero conditions using the heat pump for creation of snow or ice slurry .