The OPX REC thermal oil generator has 3 smoke ways, passing flame combustion chamber conveyed into a heat recovery unit. Is designed for low thermal loads and high oil speeds in order to eliminate any risk of cracking, namely the process of oil thermal decomposition when the oil is subjected to overheating.
In addition, the very low thermal capacity, due to reduced use of refractory cements, involves a high degree of reliability against the risk of overheating even in cases of oil circulation arrest. 

• Diathermic fluid heat generator, horizontal axis coil, spiral warped
• Fe 35 UNI 663/68 carbon steel, “MANNESMANN” quality S. S. tube coils built curved with multiple tangent spirals, various combustion gas revolutions being separated.
• Carbon steel boiler support able to ensure whole group support; a service platform is provided laterally along with the diathermic fluid circulation group
• Bolted front door, easily opened for inspection and cleaning, equipped with cone burner and combustion control light.
• External high density, mineral wool thermal insulation, with aluminium finish sheet mounted on a rectangular frame
• Fumes connection to flange exhaust, housed in the upper fumes chamber, bolted to the boiler and easily removable for cleaning operations.
• Combustion air preheater installed in the rear part of the generator so as to form a single unit consists of:
• AISI 304 stainless steel tube bundle with vertical tubes and expanded tube plates
• Hot fumes collecting chamber and outlet fitting for cold smoke
• Fume collection hood with two cleaning and inspection doors and a wide rear opening for the preheater
• Cold air intake fitting with flow that surrounds the tube bundle and crosses it in counter current
• Hot air conduction duct incorporated into generator structure in order to bring air in front of the combustion.