The RE.GUARD for monitoring water circuits in single and multi-family homes is primarily installed in basement rooms to prevent damage caused by uncontrolled water leakage. The development objective has been to achieve a simple and self-explanatory design that allows quick response and proper actions in the event of a leakage. The softly flowing, cubic form tapers towards the top and focuses attention on the control element as well as the integrated LED light bar, which lights up in red in the event of a leakage.