Abstract: A heat exchanger is provided, comprising a housing defining a cavity therein, the housing having an inlet and outlet for feeding fluid into, and removing fluid from, the cavity of the housing, a pair of fixed spaced head plates fixed to the housing at either end of the cavity to preclude passage of fluid past the plates between the housing and plates, a pair of second head plates, one for each fixed head plate and secured to the side of the fixed head plate remote the other fixed spaced head plate, at least one of which second plates being removably secured to the fixed head plates, a gasket positioned between the fixed head plates and second plates, the housing further comprising covers for covering the head plates and providing a space between the head plates and cover, a pair of spacer plates secured to the housing between the fixed head plates, each spacer plate positioned adjacent each fixed head plate, the spacer plates permitting fluid within the cavity to flow therethrough, each of the fixed and secur

Abstract: A heating system is provided, for heating liquid in a truck mounted hot line pavement striping system, including a paint storage tank and spray guns, the heating system including a conduit from the internal combustion engine of the truck leading to a series of smaller conduits passing through the thermal oil bath, as the sole heat source for heating the oil bath, and thereafter being exhausted to the atmosphere, the inner walls of the tubes having sufficient heat exchanging surface, and of sufficient number to conduct sufficient heat from the exhaust gases through the conduit wall to the oil bath to heat the thermal oil, the oil surrounding tubes within the bath, containing the paint to be sprayed "hot" from the paint guns, and a heat by-pass from the engine to by-pass the heat past the heating system.