The easiest way to increase self-consumption/use. The 3 kW screw-in heating element was specifically designed for use with the photovoltaic power manager Achtor, while the 9 kW screw-in heating element is intended for use with the photovoltaic power manager Acthor 9s. These screw-in heating elements can be installed in fresh water and buffer storage tanks. Their special design results in very low thermal surface loads on the heating elements, which directly contributes to an increased product lifespan.