The difference between duct heaters and pipe heaters

When we talk about heaters in the manufacturing industry, we often think of heating air or liquids. You've undoubtedly heard of duct heaters and pipe heaters, and we've covered them before. But do you know the difference between the two? Let's explain the difference.

Let's first discuss duct heaters. They are primarily used to heat air from an initial temperature to the desired temperature, with temperatures reaching up to 850°C. These powerful electric heaters have found widespread use in many research and production laboratories, including those in the aerospace, weapons, chemical, and university sectors. They are particularly well-suited for testing automated control systems, high-flow, high-temperature complex systems, and accessories.

Next, let's take a look at duct heaters, which differ in design from duct heaters. These heaters focus on heating air in ducts and are available in three specifications: low-temperature, medium-temperature, and high-temperature. There are two common types of electric heaters used to heat air: duct heaters and duct heaters. These two devices have different characteristics, so how can we choose the right one?

The structural similarities between all three types of duct heaters are that they all use steel plates to support the heating tubes to reduce vibration, and they all have over-temperature control devices installed in the junction box. Regarding electric heating control, a coupling device must be added between the fan and the heater to ensure that the heater starts only after the fan.

In addition, a differential pressure device should be added before and after the duct heater to prevent fan failure. The pressure of the gas heated by a duct heater generally does not exceed 0.3 kg/cm². If this pressure exceeds this specification, it is necessary to replace it with a circulation type electric heater.