You’ll not have to consider your hot water again. Solar hot water isn’t a new concept it has existed in 1 form or another for more than a century now, but the technology has advanced a good deal in the past 20 or so years.
They take longer to get hot water to the fixture, since the water needs to be inside the tankless heater for a certain amount of time to get hot. They consume a fraction of the space consumed by a tank heater. At about the size of a small suitcase, they are a fraction of the size of a traditional storage tank heater. They have been sweeping the nation with a huge growth over the last 10 years or so.