MrCool Olympus E Star 4th Gen 9,000 BTU

Model O-ES-09-HP-C-230C-O1 · O-09-HP-WMAH-230C-O

SCORE7.4 / 10

A 9k that heats like a 12k: 11,500 BTU/h at 5°F and 27.4 SEER2. Contractor install only, sold through HVAC retailers.

Specs

Spec	MrCool Olympus E Star 4th Gen 9,000 BTU
Nominal size	9,000 BTU
Voltage	230V
Rated heat at 47°F	12,000 BTU/h
Heat at 17°F	12,000 BTU/h
Heat at 5°F	11,500 BTU/h
Lowest heating temp	-22°F
Max heat at lowest temp	5,100 BTU/h
SEER2	27.4
HSPF2 (Region IV)	12.5
Install type	Flare
Max line run	82 ft
Warranty covers owner install	No
Warranty, parts	5 yr
Warranty, compressor	7 yr
ENERGY STAR Cold Climate	Yes
ENERGY STAR	Yes
Refrigerant	R-454B
Heat at 17°F per MrCool submittal	9,800 BTU/h (NEEP lists more)
Pre-charge	24.6 ft of line

Sources: NEEP ccASHP list · MrCool Olympus E Star submittal · MrCool Olympus install manual · MrCool Olympus 4th Gen warranty

"E Star" and the O-ES prefix also appear on an older R-410A Olympus (-230B condensers); confirm R-454B and an outdoor model ending -230C-O1.
The Olympus listings on Amazon are the legacy R-410A Hyper Heat, not this unit.
MrCool's FAQ says an HVAC professional must install it; the warranty's softer "may be necessary" wording doesn't change that.