MrCool DIY 5th Gen 48K Multi-Zone Condenser (6 zones)

Model DIY-MULTI6-48HP230D-O

SCORE6.3 / 10

A whole-house condenser: six heads and 37,000 Btu/h at 5°F. Its 13,000 Btu/h minimum makes it a poor match for a house of small rooms.

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Specs

Spec	MrCool DIY 5th Gen 48K Multi-Zone Condenser (6 zones)
Nominal size	48,000 BTU
Voltage	230V
Rated heat at 47°F	48,000 BTU/h
Heat at 17°F	35,200 BTU/h
Heat at 5°F	37,000 BTU/h
Lowest heating temp	-13°F
Max heat at lowest temp	21,600 BTU/h
SEER2	21.8
HSPF2 (Region IV)	10
Install type	Quick-connect
Line set in box	25 ft
Max line run	75 ft
Warranty covers owner install	Yes
Warranty, parts	5 yr
Warranty, compressor	7 yr
ENERGY STAR Cold Climate	Yes
ENERGY STAR	Yes
Refrigerant	R-454B
Zones	Up to 6 indoor units
Minimum heat output at 47°F	13,000 Btu/h (whole system)
Electrical	208/230V; 40 A MCA, 45 A max breaker
Line limits	75 ft per head, 221 ft total, 33 ft height indoor to outdoor

Sources: NEEP ccASHP list · MRCOOL DIY 5th Gen multi-zone install manual · MRCOOL DIY 5th Gen multi-zone service manual (Apr 20, 2026) · MRCOOL DIY 5th Gen limited warranty (rev. 07.03.25)

Before you buy

The 4th Gen multi-zone (C suffix, R-410A) is a different system; its 18K ran two zones, not three.
On earlier generations owners report idle heads still heating or cooling and rooms overshooting setpoint; there is no long 5th Gen record yet.
Line sets are one-time installs; runs past the standard 24.6 ft per head and ducted (AHU) air handlers call for added refrigerant per the manual.
Sold on Amazon by a third-party seller in small quantities; condenser only, heads and line sets sold separately.

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Where we cover it

MrCool DIY Multi-Zone Review: One Condenser, Many Rooms, Real Catches