I'm thinking of getting a heat pump hybrid water heater (this one maybe); The operating conditions will be technically within the prescribed range but less than optimal.
I'm wondering how I should expect the heater to perform (power consumption and heating performance) under these conditions. I would be interested in the "with ducting" and "without ducting" answers.
This water heater would be in a small room that can get down to around 40 deg F in the winter. The room is probably about 300 cubic feet but with an open doorway leading out into a hallway and into a larger room from there. The ceiling is probably about 7 feet.
Also, in a worst-case scenario, would it eventually be able to heat my tank just using the electric backup?