A manipulator having three support legs each extending between the platform and a ground. This configuration is provided in order to enhance the functional beauty of the engine wand to eliminate the need to provide specially shaped parts for cylinder heads, or the need provide a special surface treatment for the cylinder heads. The apparatus further comprises a boiler having a radiant section and a convection section, and other heat transfer units adapted to handle reduced flue gas flow rate and higher temperature flue gases than comparable airfuel combustion boilers, thus allowing a smaller heat transfer surface area, a more compact design and a higher efficiency. The first circuit is capable of pre-charging the data input terminal to a preset potential level.