1 has front wheels 3 3 and rear wheels 4 4 which are disposed beneath a main frame like body 2 of the apparatus in the same manner as in the case of an ordinary automobile it also has an engine 5 which is loaded on the main body 2 and a hydraulic pump 6 which is driven by the engine 5 it is driven while a working fluid for operating the hydraulic pump 6 is used as a power generating source the front wheels 3 3 and the rear wheels 4 4 are steerable by operation of a steering wheel 8 at an operator 39 s seat 7 provided on the main body 2 on the main body 2 the operator 39 s seat 7 is disposed at the front left side thereof various meters 9a for automatically and manually operating their corresponding devices involved are caused to appear or exposed in front of the operator 39 s seat 7 an operating board 9 in which a microcomputer is contained also is disposed in front of the operator 39 s seat 7 at the right side of the operator 39 s seat 7 as viewed from a rear side of the main body 2 a gas storage section 10 is provided in which gas cylinders 10a are loaded the gas cylinders 10a each having received therein a fuel for heating a heating panel 76 as later described on a substantially central portion of the main body 2 there is disposed an additive heater 11 at the back of which there is disposed an additive tank 12.