Dear reader, imagine the speed of light and that heat is transferred at that speed. This is how the sun warms. This is also how SBC and SBT gas infrared heaters manufactured by us heat up. Infrared radiation is the transmission of energy. Why is it economical? Now imagine a cloudy day in winter and the air temperature is -5C, it is quite cold. When the sun comes out from behind the clouds in the afternoon hours, it will become much warmer. The air temperature will not rise quickly, it will still be -5C, while our feeling of warmth, i.e. thermal comfort, will significantly improve. This is how gas heaters work, they allow for thermal comfort at a much lower air temperature, which means much lower gas consumption, especially in tall buildings.