No, the storage just needs to have a G 1 1/2 inch connection. Alternatively, many tanks may also have a revision port where a commercially available adapter can be used. When installing the ELWA direct current immersion heater, the length of the heating elements (45 cm) and the area of the heat-free zone (9 cm from the sealing surface) must be taken into account during installation. With the AC ELWA 2 alternating current immersion heater, the length of the heating elements (46 cm) and the area of the heat-free zone (14 cm from the sealing surface) must be taken into account during installation.