Abstract: A Microwave Hot Water Boiler Heating System includes a water tank with a water boiler circulator and a water refill valve and a water drain valve and a cooled water pipe that comes from the steam cooling chamber. A vacuum pump is employed to depressurize the boiler tank and vacuum pump the steam that is produced by the heated water that was heated by the microwaves coming directly from the magnetron maser. Vacuum pumping the steam from the microwave boiler heating area prevents the pressurization of steam that would damage the machine's magnetron maser. The vacuum pump also will, by its force, draw in air from the boiler tank's air inlet/overflow valve and by its force contain and compress the steam inside of the machine's steam chamber. Both, the water boiler tank and the steam chamber shall have a closed loop of coiled piping that will transfer heat to a room radiator heat exchanger. The closed loop of piping shall be filled with circulating water that is circulated by a circulator pump.