How does the "Aircon Heater" compare to the heat pump water system?

The "Aircon Heater" system produces hot water by transferring condenser heat to water.  In establishments running air conditioning systems during operational hours, hot water can therefore be generated for "free", as a byproduct of air conditioner operation.

The heat pump water heating system transfers heat from the air to water, and releases cooler air.

In theory, both air conditioner and heat pump can be used together to realize most of the same savings as the "Aircon Heater" without its disadvantages.  By ducting the cool air released by the heat pump to the air conditioned rooms, the ambient temperatures of those rooms are lowered, thus lessening the load of the air conditioner.  As energy is neither created nor destroyed, only transformed or transferred, the air conditioner operational cost reduction is approximately proportional to the hot water production of the heat pump.  Unfortunately, this system will require higher initial investment cost.