Radiation recuperators were especially engineered as heat exchangers for the glass and ceramics industries. Recuperators absorb waste heat from production and return it to the process in the circuit. The especially-developed radiation recuperators generate optimal combustion air temperatures and reduce fuel consumption significantly. The recuperator consists of an inner pipe, which is flown through by hot exhaust gas. The cold air flows in a circumferential gap between the inner pipe and a concentrically arranged air jacket. This type of design guarantees optimum heat transfer as well as maximum safety (protection) against thermal and mechanical overload. KREISEL recuperators are used in many companies of both the glass and ceramics industries and industries characterised by energy-intensive heating.