Let me start by saying this little white box has been a game-changer for my small apartment's hot water needs. The compact size (325*225*90mm) is perfect for tight spaces, and the digital temperature display in Celsius gives it a sleek, modern look.

The INSTANT hot water feature works impressively well for single-point use like kitchen sinks or bathroom faucets. I've used it for washing dishes and hands, and the water gets piping hot within seconds when set to max (55°C). However, as some reviewers noted, it struggles with higher flow rates - you'll need to reduce water pressure to get truly hot temps.

Now the ELEPHANT IN THE ROOM: the wiring instructions are dangerously wrong! The manual mixes up European and North American standards. In reality: red/brown = Hot1, blue/black = Hot2 (both 120V legs), green/yellow = ground. Please have an electrician install this unless you're confident with 240V systems.

The IPX4 waterproof rating gives peace of mind in humid environments. I particularly appreciate the safety features like auto shut-off when inactive - no more worrying about leaving it on accidentally.

For WHOLE HOUSE use? Forget it. As several users confirmed, this works best for single applications. My shower test showed it can't maintain high temps at normal flow rates - you'll get lukewarm water at best unless you trickle it.

The included shower head (3-way with nice hose) is a pleasant surprise bonus that works great when paired with reduced flow.

CUSTOMER SERVICE seems hit-or-miss based on reviews. My unit arrived complete, but others reported missing manuals and unresponsive support - something to consider before purchasing.

At around $100, this represents decent value if your expectations are realistic: compact point-of-use heater for low-flow applications with proper professional installation.