Indirect fired heater

Indirect heating

— in diesel heaters with indirect heating, the combustion chamber is equipped with a heat exchanger through which the heated air passes; while the combustion products are discharged through a separate flue and do not come into contact with this air. It allows almost without restrictions to use such units indoors (of course, if you organize the removal of exhaust gases to the outside), and in general, models of this type are more comfortable to use. On the other hand, in terms of efficiency, they lose to direct heating devices, and they are more expensive due to their more complex design.