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How much ventilation for heat pump water heater? – GreenBuildingAdvisor
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Expert Member BILL WICHERS | | #1
Ideally you want to allow for convection airflow. That means you want a vent at the top of the door, and another at the bottom. The one large vent you have might end up being enough. I’d stick a cheap electronic thermometer in there that can record high and low temperatures and just see how cold it gets in there. If the room stays warm enough for the water heater to operate efficiently, then you don’t need to worry about increasing the ventilation for the room.
Bill