external power source not shown in fig1 through 4 may be threaded extending through the circular base 672 at a location near the side of the recessed channel 696 furthest from the recessed channel 692 is a threaded aperture 700 extending through the circular base 672 at a location near the side of the recessed channel 692 furthest from the recessed channel 696 is a threaded aperture 702 extending through the circular base 672 at a location near the edge thereof and adjacent the furthest point of the passageway 686 from the hot water inlet 680 is a threaded aperture 704 which has a cylindrical countersink on the bottom side of the circular base 672 completing the construction of the lower housing member 670 are two threaded apertures 706 and 708 located near the edge of the circular base 672 on opposite sides of the aperture 698 and close to the edge of the circular base 672 referring next to fig5 through 59 a side mount adapter member 720 is illustrated which will be mounted under the lower housing member 670 shown in fig5 through 55 the top side of the side mount adapter member 720 has a configuration which approximately matches the configuration of the mounting pillar 674 of the lower housing member 670 best shown in fig5 the side mount adapter member 720 has a.