Thermal weed control, or killing weeds with hot water, is based on transferring energy to the plant. Surface water is one of the best energy carriers and is freely available in nature. An additional advantage is that water flows downwards under the influence of gravity and so reaches the plants and the roots. Air is another energy carrier. Hot air rises by nature, with the result that with weed control with hot air, a considerable proportion of the energy does not reach the plant. In addition, air is one of the worst energy carriers in nature.
For that reason, the WAVE method makes use of the positive properties of water (not steam, as that also rises after all). In combination with the sensor technology, this results in an extremely low-energy weed control method. As a result of the effective energy transfer of hot water, low treatment frequency of at most four applications per year is sufficient.