Hybrid heat pump water heaters do not operate in freezing outdoor temperatures or in cold garages during winter.
The heat pump water heater will generate a small amount of excess water, which will need to be drained to a nearby location.
For optimal performance, your unit will need adequate air supply. A 12-foot by 12-foot space is ideal, but this can also be achieved by a louvered door or ducting.
The water heater operating will create a manageable amount of noise, similar to that of a human conversation.