Best tankless water heater at a resonable price and great customer service. I call at 10 PM when i finaly done with my instalation and i was not sure about a detail. Response was profesional and right on the money. With tankless technology, sizing is paramount. If you buy a point of use unit (the cheapest !) don't expect to cover the entire house needs, regardless of how much you complain, abuse the customer service or write on all the websites wich colect your vomit!
Be nice and you are treated nice. Is now almost 3 years sence instalation and i have no complaints!