The channel heater (or a heater) — the device for air heating indoors consisting of pipes on which hot water, steam or hot air circulates.

By the principle of transfer of thermal energy distinguish electric and water (it is connected to system of a central heating) channel heaters. Depending on a configuration and the section of ventilating system use air heaters of a rectangular and round form.

There are channel heaters with utilization of heat (recovery) . In this case cold pritochny air heats up due to heat exchange with the deleted warm air. Air streams at the same time do not mix up.

As prototype of such system it is possible to consider the ammosovsky furnace .