A.O. Smith AHD 290 - Manual (Page 53)

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4.6 Hints for energy savings
Do not set the water temperature higher than necessary.
The best utilization of the heat pump occurs at low water temperatures.
The use of circulation will increase the energy consumption of the heat pump
significantly.
4.7 Hints for fan operation
When using ductwork it may be necessary to run the fan on a higher speed to
compensate for the pressure losses.
4.8 Checking
After completing installation it is advised to check all connections etc. to ensure
they are tight and to check that condensate water can flow to the drain unrestrict-
ed.
For servicing, please refer to user manual.