The Bosch Tronic 4000 instantaneous water heater type TR4001 15/18/21 EB is an electronically controlled appliance designed for efficient water heating. With its modern design and user-friendly LED display, it offers intuitive operation. The innovative Clickfix plus installation technology enables quick and easy installation, making it a practical choice for various applications. The instantaneous water heater is pressure-tight closed and is suitable for installation above the table. It can be optionally retrofitted with internet capability, which opens up additional control and monitoring options. In combination with a solar thermal system, it can reheat pre-heated water up to 55 °C, which further increases energy efficiency. With a rated output of 21 kW and an energy efficiency class of A, this instantaneous water heater is both powerful and environmentally friendly.