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Quick reference

MRCOOL DIY 5th Gen 18K Single-Zone Mini-Split Heat Pump System (DIY-18-HP-C-230D25-O + DIY-18-HP-WMAH-230D25-O)

Model: DIY-18-HP-C-230D25-O + DIY-18-HP-WMAH-230D25-O · SKU: Not documented

Prepared Nov 12, 2026

Common specifications

Cooling capacity
18,000 BTU/hSource [1]
Heating capacity
18,000 BTU/hSource [1]
SEER2
22.5Source [1]
EER2
13.7Source [1]
HSPF2
11.5Source [1]
Refrigerant
R-454BSource [1]
Refrigerant GWPNot documented
Voltage
208 to 230 VSource [1]
Solar input voltageNot documented
Maximum solar inputNot documented
AHRI certificate numberNot documented
Indoor noise
54.5 dBSource [1]
Outdoor noise
58.5 dBSource [1]
Indoor unit model
DIY-18-HP-WMAH-230D25-OSource [1, 2, 3]
Outdoor unit model
DIY-18-HP-C-230D25-OSource [1, 2, 3]
Operating temperatureNot documented
Rated current (as printed)Not documented
Power inputNot documented
DimensionsNot documented
WeightNot documented
CommunicationsNot documented
Certifications (as printed)Not documented
Enclosure volumeNot documented
Warranty term
5 yearsSource [3]

All recorded specifications

Cooling capacity
18,000 BTU/hDocumented claim
Conditions

Printed as "Cooling Capacity Btu/h 18000 24000 36000" (the brochure's second table (DIY-18, DIY-24 and DIY-36 systems); the first figure is the DIY-18-HP-C-230D25-O + DIY-18-HP-WMAH-230D25-O system's).

Location: Brochure SPECIFICATIONS, Capacity & Performance, DIY-18-HP-C-230D25-O + DIY-18-HP-WMAH-230D25-O

Printed as "Cooling Capacity Btu/h 18000 24000 36000" (the brochure's second table (DIY-18, DIY-24 and DIY-36 systems); the first figure is the DIY-18-HP-C-230D25-O + DIY-18-HP-WMAH-230D25-O system's).

Location: Brochure SPECIFICATIONS, Capacity & Performance, DIY-18-HP-C-230D25-O + DIY-18-HP-WMAH-230D25-O

[1]
EER2
13.7Documented claim
Conditions

Printed as "EER2 Btu/hr/w 13.7 12.7 8.5" (the brochure's second table (DIY-18, DIY-24 and DIY-36 systems); the first figure is the DIY-18-HP-C-230D25-O + DIY-18-HP-WMAH-230D25-O system's). Manufacturer claim.

Location: Brochure SPECIFICATIONS, Capacity & Performance, DIY-18-HP-C-230D25-O + DIY-18-HP-WMAH-230D25-O

Printed as "EER2 Btu/hr/w 13.7 12.7 8.5" (the brochure's second table (DIY-18, DIY-24 and DIY-36 systems); the first figure is the DIY-18-HP-C-230D25-O + DIY-18-HP-WMAH-230D25-O system's). Manufacturer claim.

Location: Brochure SPECIFICATIONS, Capacity & Performance, DIY-18-HP-C-230D25-O + DIY-18-HP-WMAH-230D25-O

[1]
Heating capacity
18,000 BTU/hDocumented claim
Conditions

Printed as "Heating Capacity Btu/h 18000 24000 36000" (the brochure's second table (DIY-18, DIY-24 and DIY-36 systems); the first figure is the DIY-18-HP-C-230D25-O + DIY-18-HP-WMAH-230D25-O system's).

Location: Brochure SPECIFICATIONS, Capacity & Performance, DIY-18-HP-C-230D25-O + DIY-18-HP-WMAH-230D25-O

Printed as "Heating Capacity Btu/h 18000 24000 36000" (the brochure's second table (DIY-18, DIY-24 and DIY-36 systems); the first figure is the DIY-18-HP-C-230D25-O + DIY-18-HP-WMAH-230D25-O system's).

Location: Brochure SPECIFICATIONS, Capacity & Performance, DIY-18-HP-C-230D25-O + DIY-18-HP-WMAH-230D25-O

[1]
HSPF2
11.5Documented claim
Conditions

HSPF2 for climate region 4, printed as "HSPF2-4 Btu/hr/w 11.5 9.5 8.5 HSPF2-5 Btu/hr/w 8.5 7.1 6.5" (the brochure's second table (DIY-18, DIY-24 and DIY-36 systems); the first figure is the DIY-18-HP-C-230D25-O + DIY-18-HP-WMAH-230D25-O system's); region 5 is 8.5. Manufacturer claim.

Location: Brochure SPECIFICATIONS, Capacity & Performance, DIY-18-HP-C-230D25-O + DIY-18-HP-WMAH-230D25-O

HSPF2 for climate region 4, printed as "HSPF2-4 Btu/hr/w 11.5 9.5 8.5 HSPF2-5 Btu/hr/w 8.5 7.1 6.5" (the brochure's second table (DIY-18, DIY-24 and DIY-36 systems); the first figure is the DIY-18-HP-C-230D25-O + DIY-18-HP-WMAH-230D25-O system's); region 5 is 8.5. Manufacturer claim.

Location: Brochure SPECIFICATIONS, Capacity & Performance, DIY-18-HP-C-230D25-O + DIY-18-HP-WMAH-230D25-O

[1]
Indoor noise
54.5 dBDocumented claim
Conditions

The Turbo figure of "54.5/44.5/40.5/30.5/19" (Turbo/Hi/Mi/Lo/Si), printed as "Indoor Noise Level (Turbo/Hi/Mi/Lo/Si) dB(A) 54.5/44.5/40.5/30.5/19 54/48/43/33.5/20 55.5/49.5/43.5/38/27.5" (the brochure's second table (DIY-18, DIY-24 and DIY-36 systems); the first figure is the DIY-18-HP-C-230D25-O + DIY-18-HP-WMAH-230D25-O system's); MRCOOL prints no measuring distance.

Location: Brochure SPECIFICATIONS, Indoor Noise Level, DIY-18-HP-C-230D25-O + DIY-18-HP-WMAH-230D25-O

The Turbo figure of "54.5/44.5/40.5/30.5/19" (Turbo/Hi/Mi/Lo/Si), printed as "Indoor Noise Level (Turbo/Hi/Mi/Lo/Si) dB(A) 54.5/44.5/40.5/30.5/19 54/48/43/33.5/20 55.5/49.5/43.5/38/27.5" (the brochure's second table (DIY-18, DIY-24 and DIY-36 systems); the first figure is the DIY-18-HP-C-230D25-O + DIY-18-HP-WMAH-230D25-O system's); MRCOOL prints no measuring distance.

Location: Brochure SPECIFICATIONS, Indoor Noise Level, DIY-18-HP-C-230D25-O + DIY-18-HP-WMAH-230D25-O

[1]
Indoor unit model
DIY-18-HP-WMAH-230D25-ODocumented claim
Conditions

Printed in the brochure's MODEL NO. row, in the manual's unit pairing table as "18K DIY-18-HP-WMAH-230D25-O DIY-18-HP-C-230D25-O" and in the warranty's ductless air handler list. The brochure prints its net dimensions (W x D x H) as 1080 x 226 x 335 mm and its net weight as 16.1 kg (35.49 lb) (the brochure's second table (DIY-18, DIY-24 and DIY-36 systems); the first figure is the DIY-18-HP-C-230D25-O + DIY-18-HP-WMAH-230D25-O system's).

Location: Brochure SPECIFICATIONS, MODEL NO. Indoor Unit row; manual unit pairing table; warranty Ductless Air Handlers list

Printed in the brochure's MODEL NO. row, in the manual's unit pairing table as "18K DIY-18-HP-WMAH-230D25-O DIY-18-HP-C-230D25-O" and in the warranty's ductless air handler list. The brochure prints its net dimensions (W x D x H) as 1080 x 226 x 335 mm and its net weight as 16.1 kg (35.49 lb) (the brochure's second table (DIY-18, DIY-24 and DIY-36 systems); the first figure is the DIY-18-HP-C-230D25-O + DIY-18-HP-WMAH-230D25-O system's).

Location: Brochure SPECIFICATIONS, MODEL NO. Indoor Unit row; manual unit pairing table; warranty Ductless Air Handlers list

[1, 2, 3]
Outdoor noise
58.5 dBDocumented claim
Conditions

Printed as "Outdoor Noise Level dB(A) 58.5 58.5 60.5" (the brochure's second table (DIY-18, DIY-24 and DIY-36 systems); the first figure is the DIY-18-HP-C-230D25-O + DIY-18-HP-WMAH-230D25-O system's); MRCOOL prints no measuring distance.

Location: Brochure SPECIFICATIONS, Outdoor Noise Level, DIY-18-HP-C-230D25-O + DIY-18-HP-WMAH-230D25-O

Printed as "Outdoor Noise Level dB(A) 58.5 58.5 60.5" (the brochure's second table (DIY-18, DIY-24 and DIY-36 systems); the first figure is the DIY-18-HP-C-230D25-O + DIY-18-HP-WMAH-230D25-O system's); MRCOOL prints no measuring distance.

Location: Brochure SPECIFICATIONS, Outdoor Noise Level, DIY-18-HP-C-230D25-O + DIY-18-HP-WMAH-230D25-O

[1]
Outdoor unit model
DIY-18-HP-C-230D25-ODocumented claim
Conditions

Printed in the brochure's MODEL NO. row ("MODEL NO. Outdoor Unit DIY-18-HP-C-230D25-O DIY-24-HP-C-230D25-O DIY-36-HP-C-230D25-O Indoor Unit DIY-18-HP-WMAH-230D25-O DIY-24-HP-WMAH-230D25-O DIY-36-HP-WMAH-230D25-O"), in the manual's unit pairing table as "18K DIY-18-HP-WMAH-230D25-O DIY-18-HP-C-230D25-O" and in the warranty's condenser list. The brochure prints its net dimensions (W x D x H) as 890 x 342 x 673 mm and its net weight as 42.4 kg (93.48 lb) ("Net Dimension (WxDxH) Indoor inch mm 42.52 x 8.90 x 13.19 1080 x 226 x 335 42.52 x 8.90 x 13.19 1080 x 226 x 335 49.57 x 11.10 x 14.25 1259 x 282 x 362 Outdoor inch mm 35.04 x 13.46 x 26.50 890 x 342 x 673 37.24 x 16.14 x 31.89 946 x 410 x 810 37.24 x 16.14 x 31.89 946 x 410 x 810"; "Net/Gross Weight Indoor lbs kg 35.49/49.60 16.1/22.5 35.93/49.82 16.3/22.6 48.72/67.90 22.1/30.8 Outdoor lbs kg 93.48/114.20 42.4/51.8 122.80/155.64 55.7/70.6 152.12/183.42 69/83.2", the brochure's second table (DIY-18, DIY-24 and DIY-36 systems); the first figure is the DIY-18-HP-C-230D25-O + DIY-18-HP-WMAH-230D25-O system's).

Location: Brochure SPECIFICATIONS, MODEL NO. Outdoor Unit row; manual unit pairing table; warranty Condensers list

Printed in the brochure's MODEL NO. row ("MODEL NO. Outdoor Unit DIY-18-HP-C-230D25-O DIY-24-HP-C-230D25-O DIY-36-HP-C-230D25-O Indoor Unit DIY-18-HP-WMAH-230D25-O DIY-24-HP-WMAH-230D25-O DIY-36-HP-WMAH-230D25-O"), in the manual's unit pairing table as "18K DIY-18-HP-WMAH-230D25-O DIY-18-HP-C-230D25-O" and in the warranty's condenser list. The brochure prints its net dimensions (W x D x H) as 890 x 342 x 673 mm and its net weight as 42.4 kg (93.48 lb) ("Net Dimension (WxDxH) Indoor inch mm 42.52 x 8.90 x 13.19 1080 x 226 x 335 42.52 x 8.90 x 13.19 1080 x 226 x 335 49.57 x 11.10 x 14.25 1259 x 282 x 362 Outdoor inch mm 35.04 x 13.46 x 26.50 890 x 342 x 673 37.24 x 16.14 x 31.89 946 x 410 x 810 37.24 x 16.14 x 31.89 946 x 410 x 810"; "Net/Gross Weight Indoor lbs kg 35.49/49.60 16.1/22.5 35.93/49.82 16.3/22.6 48.72/67.90 22.1/30.8 Outdoor lbs kg 93.48/114.20 42.4/51.8 122.80/155.64 55.7/70.6 152.12/183.42 69/83.2", the brochure's second table (DIY-18, DIY-24 and DIY-36 systems); the first figure is the DIY-18-HP-C-230D25-O + DIY-18-HP-WMAH-230D25-O system's).

Location: Brochure SPECIFICATIONS, MODEL NO. Outdoor Unit row; manual unit pairing table; warranty Condensers list

[1, 2, 3]
Refrigerant
R-454BDocumented claim
Conditions

Printed as "Refrigerant R-454B oz 44.80 67.37 109.70" (the brochure's second table (DIY-18, DIY-24 and DIY-36 systems); the first figure is the DIY-18-HP-C-230D25-O + DIY-18-HP-WMAH-230D25-O system's); this system's charge is 44.80 oz.

Location: Brochure SPECIFICATIONS, REFRIGERANT & PIPING, DIY-18-HP-C-230D25-O + DIY-18-HP-WMAH-230D25-O

Printed as "Refrigerant R-454B oz 44.80 67.37 109.70" (the brochure's second table (DIY-18, DIY-24 and DIY-36 systems); the first figure is the DIY-18-HP-C-230D25-O + DIY-18-HP-WMAH-230D25-O system's); this system's charge is 44.80 oz.

Location: Brochure SPECIFICATIONS, REFRIGERANT & PIPING, DIY-18-HP-C-230D25-O + DIY-18-HP-WMAH-230D25-O

[1]
SEER2
22.5Documented claim
Conditions

Printed as "SEER2 Btu/hr/w 22.5 22.7 18" (the brochure's second table (DIY-18, DIY-24 and DIY-36 systems); the first figure is the DIY-18-HP-C-230D25-O + DIY-18-HP-WMAH-230D25-O system's); the brochure marks its data "*Data provided by AHRI". Manufacturer claim.

Location: Brochure SPECIFICATIONS, Capacity & Performance, DIY-18-HP-C-230D25-O + DIY-18-HP-WMAH-230D25-O

Printed as "SEER2 Btu/hr/w 22.5 22.7 18" (the brochure's second table (DIY-18, DIY-24 and DIY-36 systems); the first figure is the DIY-18-HP-C-230D25-O + DIY-18-HP-WMAH-230D25-O system's); the brochure marks its data "*Data provided by AHRI". Manufacturer claim.

Location: Brochure SPECIFICATIONS, Capacity & Performance, DIY-18-HP-C-230D25-O + DIY-18-HP-WMAH-230D25-O

[1]
Voltage
208 to 230 VDocumented claim
Conditions

Printed as "Power Supply V ~ Hz.Ph 208-230V, 60Hz, 1Ph 208-230V, 60Hz, 1Ph 208-230V, 60Hz, 1Ph" (the brochure's second table (DIY-18, DIY-24 and DIY-36 systems); the first figure is the DIY-18-HP-C-230D25-O + DIY-18-HP-WMAH-230D25-O system's): 208-230 V AC, 60 Hz, single phase. The same table prints a minimum circuit ampacity of 18 A and a maximum fuse of 20 A for the outdoor unit ("Minimum Circuit Ampacity (Outdoor) A 18 24 33 Maximum Fuse (Outdoor) A 20 25 35").

Location: Brochure SPECIFICATIONS, ELECTRICAL PARTS, DIY-18-HP-C-230D25-O + DIY-18-HP-WMAH-230D25-O

Printed as "Power Supply V ~ Hz.Ph 208-230V, 60Hz, 1Ph 208-230V, 60Hz, 1Ph 208-230V, 60Hz, 1Ph" (the brochure's second table (DIY-18, DIY-24 and DIY-36 systems); the first figure is the DIY-18-HP-C-230D25-O + DIY-18-HP-WMAH-230D25-O system's): 208-230 V AC, 60 Hz, single phase. The same table prints a minimum circuit ampacity of 18 A and a maximum fuse of 20 A for the outdoor unit ("Minimum Circuit Ampacity (Outdoor) A 18 24 33 Maximum Fuse (Outdoor) A 20 25 35").

Location: Brochure SPECIFICATIONS, ELECTRICAL PARTS, DIY-18-HP-C-230D25-O + DIY-18-HP-WMAH-230D25-O

[1]

Warranty

Warranty term
5 yearsDocumented claim
Conditions

Printed as "The unit comes standard with a 5 year parts and 7 year compressor warranty."; the five years are the parts term and the compressor term is seven years. Conditions and exclusions are in MRCOOL's warranty document.

Location: Warranty, STANDARD LIMITED WARRANTY COVERAGE

Printed as "The unit comes standard with a 5 year parts and 7 year compressor warranty."; the five years are the parts term and the compressor term is seven years. Conditions and exclusions are in MRCOOL's warranty document.

Location: Warranty, STANDARD LIMITED WARRANTY COVERAGE

[3]

Certificate records

No records documented.

Sources and revisions

  1. MRCOOL 5th Gen DIY Single Zone Series brochure, V: 06.24.26 (systems DIY-09 to DIY-36, outdoor DIY-xx-HP-C and indoor DIY-xx-HP-WMAH units)Official document · Checked https://doxrepo.mrcool.com/mc-diy-5-br-en-01.pdf
  2. MRCOOL DIY Series Single-Zone Mini-Split System installation and owner's manual (version date August 5, 2026)Official installation manual · Checked https://doxrepo.mrcool.com/mc-diy-5-sz-im-um-en-01.pdf
  3. MRCOOL DIY 5th Generation limited warrantyOfficial warranty · Checked https://doxrepo.mrcool.com/mc-diy-5-wr-en-01.pdf