We've had a tankless AquaStar (made in France) water heater for around 20 years now. That was a popular brand when we bought it. We're very happy with it, live in a small ranch house, 2 bedroom and finished basement, and it's served us well over the years. If we had to replace it someday, it would be with another tankless heater. It's gas. Sometimes the water temperature can fluctuate and gets a bit too hot, but my husband makes any necessary adjustments and basically cleans and services it himself. It's really been pretty care-free. Nice to never run out of hot water, even when we have company and numerous people taking showers, doing laundry, etc.