I wouldn't buy one. If you have an electric or gas tank type water heater that fails, it can be replaced in less than a day by several reputable contractors. But, if you have a hybrid water heater that fails, you may be without hot water for a lot longer time, and you may have trouble finding a contractor and/or parts. I always install standard appliances and other construction materials for that reason.
There was another thread where a guy was waiting 4 months for a special part for his fancy variable speed HVAC system.
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