What Mike said. The actual heat transfer depends on a lot, but since you have forced air heating, you're not going to be wasting power. Heat rises, so your forced air will stratify above what comes from the water heater. The cold air from the water heater will drop to the floor and cancel out some of the heat loss through the basement floor. If anything, you will be robbing some energy from the forced air system to heat water. Since this heat came through another heat pump indoors, you're not wasting power.
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