US EQUIPMENT REFERENCE

Willis

35 equipment models and 71 source-listed options. Brand names follow the published records; a shared manufacturer does not imply interchangeable equipment.

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35 models · Source-backed US equipment index

A model may have several rated combinations.
WillisAir-source heat pump

Multiple source series

AUHW09KR32-O

6 published source records

22.3–30SEER2 range
9.5–11.2HSPF2 range

Open a configuration for heating capacity at 47°F, 17°F and 5°F, COP and EER2.

WillisAir-source heat pump

Multiple source series

AUHW12KR32-O

6 published source records

20–29.5SEER2 range
8.5–10HSPF2 range

Open a configuration for heating capacity at 47°F, 17°F and 5°F, COP and EER2.

WillisAir-source heat pump

ULTIMA

AUHW18KR32-O

1 published source record

27.5SEER2 range
10HSPF2 range

Open a configuration for heating capacity at 47°F, 17°F and 5°F, COP and EER2.

WillisAir-source heat pump

ULTIMA

AUHW24KR32-O

1 published source record

27SEER2 range
10HSPF2 range

Open a configuration for heating capacity at 47°F, 17°F and 5°F, COP and EER2.

WillisAir-source heat pump

Charmo

CHW09KAR32-O

1 published source record

20.5SEER2 range
8.8HSPF2 range

Open a configuration for heating capacity at 47°F, 17°F and 5°F, COP and EER2.

WillisAir-source heat pump

Charmo

CHW12KCH18S2-O

1 published source record

17.5SEER2 range
8.5HSPF2 range

Open a configuration for heating capacity at 47°F, 17°F and 5°F, COP and EER2.

WillisAir-source heat pump

Charmo

CHW12KR32-O

1 published source record

19SEER2 range
8.5HSPF2 range

Open a configuration for heating capacity at 47°F, 17°F and 5°F, COP and EER2.

WillisAir-source heat pump

Charmo

CHW18KR32-O

1 published source record

20SEER2 range
8.5HSPF2 range

Open a configuration for heating capacity at 47°F, 17°F and 5°F, COP and EER2.

WillisAir-source heat pump

Charmo

CHW24KR32-O

1 published source record

19SEER2 range
8.5HSPF2 range

Open a configuration for heating capacity at 47°F, 17°F and 5°F, COP and EER2.

WillisAir-source heat pump

Charmo

CHW30KR32-O

1 published source record

22SEER2 range
9HSPF2 range

Open a configuration for heating capacity at 47°F, 17°F and 5°F, COP and EER2.

WillisAir-source heat pump

Charmo

CHW36KR32-O

1 published source record

21SEER2 range
8.5HSPF2 range

Open a configuration for heating capacity at 47°F, 17°F and 5°F, COP and EER2.

WillisAir-source heat pump

FLEXX High-efficiency Series

FLEX24/36KUH

1 published source record

16SEER2 range
9HSPF2 range

Open a configuration for heating capacity at 47°F, 17°F and 5°F, COP and EER2.

WillisAir-source heat pump

FLEXX R32

FLEX24KUHR32

1 published source record

18SEER2 range
10HSPF2 range

Open a configuration for heating capacity at 47°F, 17°F and 5°F, COP and EER2.

WillisAir-source heat pump

Multiple source series

FLEX36KUHR32

4 published source records

16–18SEER2 range
8.5–10HSPF2 range

Open a configuration for heating capacity at 47°F, 17°F and 5°F, COP and EER2.

WillisAir-source heat pump

FLEXX High-efficiency Series

FLEX48/60KUH

1 published source record

16SEER2 range
9HSPF2 range

Open a configuration for heating capacity at 47°F, 17°F and 5°F, COP and EER2.

WillisAir-source heat pump

FLEXX R32

FLEX48KUHR32

1 published source record

19SEER2 range
10HSPF2 range

Open a configuration for heating capacity at 47°F, 17°F and 5°F, COP and EER2.

WillisAir-source heat pump

Multiple source series

FLEX60KUHR32

4 published source records

16–19SEER2 range
9–10.5HSPF2 range

Open a configuration for heating capacity at 47°F, 17°F and 5°F, COP and EER2.

WillisAir-source heat pump

MultiHeat

MZUHW18KCH21S2-O

1 published source record

21SEER2 range
10HSPF2 range

1 EPA outdoor-model records do not list an indoor configuration. Open the ratings to check their scope.

WillisAir-source heat pump

MULTI HEAT

MZUHW18KR32-O

3 published source records

18–21SEER2 range
8.1–10HSPF2 range

3 EPA outdoor-model records do not list an indoor configuration. Open the ratings to check their scope.

WillisAir-source heat pump

MultiHeat

MZUHW24KCH21S2-O

1 published source record

21SEER2 range
10HSPF2 range

1 EPA outdoor-model records do not list an indoor configuration. Open the ratings to check their scope.

WillisAir-source heat pump

MULTI HEAT

MZUHW24KR32-O

3 published source records

18–21SEER2 range
8.1–10HSPF2 range

3 EPA outdoor-model records do not list an indoor configuration. Open the ratings to check their scope.

WillisAir-source heat pump

MultiHeat

MZUHW30KCH21S2-O

1 published source record

21SEER2 range
10HSPF2 range

1 EPA outdoor-model records do not list an indoor configuration. Open the ratings to check their scope.

WillisAir-source heat pump

MULTI HEAT

MZUHW30KR32-O

3 published source records

18–21SEER2 range
8.1–10HSPF2 range

3 EPA outdoor-model records do not list an indoor configuration. Open the ratings to check their scope.

WillisAir-source heat pump

MultiHeat

MZUHW36KCH21S2-O

1 published source record

21SEER2 range
10HSPF2 range

1 EPA outdoor-model records do not list an indoor configuration. Open the ratings to check their scope.