Radiant heat is similar to the warmth felt by the sun on a cool winter's day. It’s the heat that warms people and objects, not the air.

The ‘radiant efficiency’ or ‘radiant factor’of a gas radiant overhead heater is determined by the percentage of fuel energy transformed into radiant energy from the combustion process. More simply put, the radiant factor is the measure of the radiant component of the total heat output.

Radiant Energy 

Radiant energy is emitted by any 'body' that is warmer than its surroundings. Radiant energy is a function of three factors:

  • the surface temperature of the emitting body
  • the surface area of the emitting body
  • the 'emissivity' factor of the emitting body.
A perfect example of a product with a high radiant factor is the Schwank Gas Radiant Overhead Tube Heaters.

Schwank gas radiant overhead tube heaters are designed and manufactured based on the science of radiant heat. Radiant factor certificates are offered on a number of models and are backed by independent laboratory testing.

The calorSchwank is an example of an overhead gas radiant tube heating system with a very high radiant factor of up to 72.2%, followed by the infraSchwank - up to 60.2% and the novoSchwank - up to 52%.