Nature provided the inspiration for the HT-3000: The hydrosun® irradiators have a patented, sealed liquid filter that enables them to replicate the combination of the sun and the moisture in the Earth‘s atmosphere. A water filter absorbs infrared light of those wavelengths that would otherwise present a thermal burden to the skin.

An important feature of water-filtered infrared-A (wIRA) is its ability to penetrate into deeper-lying tissues while at the same time being gentle to the skin, thus allowing the application of wIRA at higher intensities resulting in increased effectiveness. The rise in the body‘s core temperature is correspondingly rapid and well-tolerated. In the leg and foot regions, further infrared emitters create a comfortable temperature in the interior of the tent so that the minimising heat loss.