Chillers require slightly less water circulation than heat pumps. The required water flow rate is higher for heat pumps due to the need to complete a successful defrost cycle in the heating mode.
| Model | Cooling GPM | Heating GPM |
| ANK030 |
7 |
8 |
| ANK045 |
9 |
12 |
| ANK050 |
11 |
13 |