I commute daily from Cologne-Deutz to Deutz-Mülheim, so roughly 25km in total. I always arrived exhausted on my old Cube, and now I'm thinking about getting an e-bike. Which models are reliable and not too expensive? Good range and robust components are important to me.
For 25km daily, I'd look at a model with at least a 500-600Wh battery so you get there safely even in worse weather or if you want to ride faster. Brands like Decathlon (Stilus), Cube or Canyon have solid e-bikes in that price range - they deliver what they promise and aren't too high-maintenance. What matters is test riding one locally - how the pedal assist feels is very personal, and with a daily commute you don't want to make a mistake on that. Also try to find a local shop in Köln, that way you've just got better service in case something comes up.
For your commute distance, you definitely need a battery with decent capacity - I agree with the previous comment on that. With 25km a day, especially if you're dealing with wind or hills, you should plan for at least 500Wh, ideally 600-700Wh. That gives you a safety buffer and you'll still arrive relaxed even after a tough day, without the battery running on empty.
But here's what hardly anyone pays attention to: check the drivetrain carefully. For daily commuters, hub gears (like 8 or 11-speed) are way more low-maintenance than derailleur systems. No front derailleur going out of alignment, no worn-out chains every three months - that saves you time and money. Models from Decathlon, but also KTM or Riese & Müller (if your budget allows) have solid options there. Diamantrad and similar brands also offer good e-bikes in the under-3000€ range with this kind of setup.
And one more hack: grab a cheap charging station for your office in parallel, or ask your employer if you can charge there. With 25km there and back, you don't need a second battery, but if you can charge mid-week, you always have maximum range. That makes the difference between comfortable and stressful.
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