Let me start by saying this: the Stiebel Eltron Tempra 29 Plus is a BEAST when it comes to delivering hot water on demand. I installed it in my two-story home, and the difference from my old tank heater was night and day. No more 'shower roulette' where the last person gets a cold surprise!

The GOOD stuff first: The unlimited hot water is REAL. I've run two showers simultaneously while washing dishes, and it didn't flinch. The temperature control is surgical - you can set it to your exact preference (I love the memory presets for my extra-hot bath soaks). And space-saving? This slim white box tucks neatly into a closet, freeing up precious square footage.

Now the REAL TALK: Installation isn't DIY-friendly. You'll need an electrician to handle those three 40-amp breakers (my upgrade cost nearly as much as the unit itself). During a week-long power outage, I missed my old gas heater that worked without electricity - something to consider if you live in storm-prone areas.

Pro tip from experience: Pair it with a whole-house water filter. The manual recommends this, and after seeing some mineral buildup during my first descaling, I understood why. Also, while it handles multiple showers fine, running EVERY hot water appliance at once (looking at you, laundry-loving spouse) might test its limits.

Final verdict? If you've got the electrical capacity and want to never worry about hot water again (while saving space and energy), this German-engineered unit delivers. Just budget for professional installation and maybe a water softener if you've got hard water. After six months of steamy bliss, I'd buy it again in a heartbeat.