Panasonic / EXTERIOS Z Series
Panasonic EXTERIOS Z 18k R-32 208/230V Mini-Split
The Panasonic EXTERIOS Z 18k mirrors the ClimaPure XZ 18k: SEER2 22, EER2 13.65, HSPF2 11.7 on R-32, heating to 21,000 BTU at 17F and 17,800 BTU at 5F, at 1.5 tons. Same outdoor and ratings, different indoor head.
1 zoneProfessional installCurrent
Refrigerant generation
R-32 - current-generation refrigerant
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Image: Panasonic
Data completeness: 95%
- Last sourced
- Jul 24, 2026
SplitAtlas score
9.3 / 10
Cooling efficiencyAbove average
(22.0 SEER2) among 18k systems
Heating efficiencyTop 10%
(11.7 HSPF2) among 18k systems
Cold-weather performanceTop quartile
(100% heat retained at 5F; -15 F heating floor) among 18k systems
NoiseTop 10%
(-46 dBA indoor min / 52 dBA outdoor) among 18k systems
Feature setTop quartile
(6 verified features) across the catalogue
Documentation & partsBelow average
(8 manuals; spec sheet) across the catalogue
Not evaluated
- Installation accessibility — not applicable (professional install)N/A
professional install - DIY-accessibility not applicable
- Price-to-value — not evaluatedN/A
This is a professionally installed, quote-only system, so we can't score its price. Get an installed quote to compare real cost.
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Key ratings
Buyer review snapshot
Best for / skip if
Best for
- High-efficiency shortlists; SEER2 is 22.
Install difficulty
Professional install
- Electrical: 230V; MCA 15 A; breaker/fuse 20 A.
- Line set: connection type not sourced; precharged 25 ft; max 100 ft.
Availability and price context
We could not verify a current retail price for this model. We could not find this exact model in stock at a retailer we work with when we last checked on 2026-07-24.
Source date
- Model data sourced
- Jul 24, 2026
- Page reviewed
- Jul 23, 2026
- Source-backed records
- 4
- Newest source retrieved
- Jul 24, 2026
Model context
- Install path
- This is professional-install equipment; no verified current retail offer is attached.
Strengths
- Heating boosts to 21,000 BTU at 17F and holds 17,800 BTU at 5F - strong deep-cold output.
- SEER2 22 / HSPF2 11.7, identical to the XZ 18k; current R-32.
- Panasonic dealer support.
Weaknesses
- Same performance as the ClimaPure XZ 18k - decide on indoor features and price.
Climate suitability
- Minimum heating ambient
- -15 F[2]
- Rated heating at 5F
- 17,800 BTU/h[3]
- Rated heating at 17F
- 21,000 BTU/h[3]
- Rated heating at 47F
- 17,200 BTU/h[3]
Specifications
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- Manufacturer
- Panasonic
- Brand
- Panasonic
- Product line
- EXTERIOS Z Series
- Model number
- CS-Z18AKUAW indoor / CU-XZ18AKUAC outdoor
- Indoor unit model
- CS-Z18AKUAW
- Outdoor unit model
- CU-XZ18AKUAC
- Number of zones
- 1
- Max indoor units
- not published
- Rated cooling capacity
- 17,200 BTU/h[3]
- Rated heating capacity
- 17,200 BTU/h[3]
- Voltage
- 230 V[1]
- MCA
- 15 A[2]
- Maximum fuse or breaker size
- 20 A[2]
- Breaker needed
- not published
- SEER2
- 22 SEER2[3]
- EER2
- 13.65 EER2[3]
- HSPF2 (Region 4)
- 11.7 HSPF2[3]
- HSPF2 (Region 5)
- not published
- COP
- not published
- COP at 47F
- not published
- COP at 5F
- 2.22 COP[3]
- Minimum outdoor heating temperature
- -15 F[2]
- Minimum outdoor cooling temperature
- 0 F[2]
- Maximum outdoor temperature
- 115 F[2]
- Indoor noise range
- 34-46 dB(A)[2]
- Outdoor noise rating
- 52 dBA[2]
- Indoor weight
- 31 lb[1]
- Outdoor weight
- 14 lb[1]
- Refrigerant
- R-32[3]
- Refrigerant charge
- not published
- Manufacturer coverage
- not published
- Line-set size
- 1/4 in liquid / 1/2 in suction
- Included line-set length
- Panasonic current R-32 high-wall professional-install sources publish refrigerant piping size, maximum length, and precharged length, but no included line set.
- Maximum line-set length
- 100 ft[2]
- Max line set per indoor
- not published
- Maximum elevation difference
- 65.6 ft[2]
- Max height between indoor units
- not published
- Wi-Fi support
- not supported[1]
- Energy Star status
- ENERGY STAR certified[4]
- AHRI certification number
- 215387074[3]
- Warranty
- not published
- Install path
- Professional install
- Retail price
- We could not find this exact model in stock at a retailer we work with when we last checked on 2026-07-24.
- Available retailers
- not published
- Manual links
- AHRI certificate 215387074, AHRI public directory record 215387074, ENERGY STAR exact Panasonic row for CS-Z18AKUAW / CU-XZ18AKUAC, HVACDirect exact Panasonic search summary for CS-Z18AKUAW / CU-XZ18AKUAC, Panasonic EXTERIOS Z Series 18k installation manual, Panasonic EXTERIOS Z Series 18k product page extracted text, Panasonic EXTERIOS Z Series 18k product page snapshot, Panasonic EXTERIOS Z Series 18k system submittal
- Specification sheet
- Panasonic EXTERIOS Z Series 18k product page snapshot
- Last sourced date
- Jul 24, 2026
Installation considerations
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- Liquid line
- 1/4 in[2]
- Suction line
- 1/2 in[2]
- Line connection type
- not published
- Precharged length
- 25 ft[2]
- Included line-set length
- Panasonic current R-32 high-wall professional-install sources publish refrigerant piping size, maximum length, and precharged length, but no included line set.
- Maximum line-set length
- 100 ft[2]
- Max line set per indoor
- not published
- Max height between indoor units
- not published
- Indoor dimensions
- 40-31/32 x 9-5/8 x 11-5/8 in[1]
- Outdoor dimensions
- 34-15/32 x 12-5/8 x 31-5/16 in[1]
- Indoor weight
- 31 lb[1]
- Outdoor weight
- 14 lb[1]
- Drain size
- not published
Related systems and guides
- More Panasonic systems
- Panasonic ClimaPure XZ Series 17.2k 230V
- Multi-Zone Essentials 17.7k
- Multi-Zone 18k
- M-Series WX 17.2k
- Guide library
- Mini split buying guide
- Single-zone vs multi-zone mini splits
- Troubleshooting
- Do mini splits work in cold weather?
- The best cold-climate mini splits of 2026
- The best mini splits for heating of 2026
- Mini split heating capacity in the cold: what your unit actually delivers at 5F
- The mini split defrost cycle, explained
- The best DIY mini splits of 2026
- What "DIY mini split" actually means
- How to install a mini split (DIY overview)
- R-32 vs R-454B: the mini split refrigerant change explained
- How to reset a mini split
- Mini split not heating
- Mini split indoor unit freezing up
- Mini split remote not working
- Mini split weak airflow
- Mini split Wi-Fi not connecting
- Line sets
- Line-set covers
Frequently asked questions
- Can I install the Panasonic EXTERIOS Z Series 18,000 BTU R-32 208/230V (CS-Z18AKUAW / CU-XZ18AKUAC) myself, or do I need a pro?
- Panasonic EXTERIOS Z Series 18,000 BTU R-32 208/230V (CS-Z18AKUAW / CU-XZ18AKUAC) is built for professional installation: the line set must be flared, evacuated, and charged, which requires EPA-certified refrigerant handling. Installing it outside the manufacturer's requirements can void the warranty, so budget for a qualified HVAC installer.
- Will the Panasonic EXTERIOS Z Series 18,000 BTU R-32 208/230V (CS-Z18AKUAW / CU-XZ18AKUAC) keep heating in a cold winter?
- The manufacturer publishes 17,800 BTU/h of heating output at 5F. Rated heating operation extends down to -15 F. Certified heating efficiency is 11.7 HSPF2. Match those numbers against your climate's design temperature - in cold regions, output at 5F matters far more than the nameplate capacity measured at 47F.
- What electrical circuit does the Panasonic EXTERIOS Z Series 18,000 BTU R-32 208/230V (CS-Z18AKUAW / CU-XZ18AKUAC) need?
- Published electrical requirements: 230 V voltage, 15 A minimum circuit ampacity, and 20 A maximum breaker or fuse sizing. Confirm the final circuit against the unit nameplate and local code with a licensed electrician.
- How far can the outdoor unit be from the indoor head?
- The published maximum line-set length is 100 ft, and the included line set comes pre-charged for 25 ft. Longer runs than the included set allows typically mean added refrigerant and a pro visit, so measure the planned routing before ordering.
Data sources
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- Panasonic Corporation of North America: Panasonic EXTERIOS Z Series 18k manufacturer product pageSourced - manufacturer product page
Covers Frequency, Phase, Voltage, Voltage range, Indoor dimensions, Indoor weight and more
- Panasonic Corporation of North America: Panasonic EXTERIOS Z Series 18k system submittalSourced - manufacturer technical document
Covers Maximum breaker size, Maximum fuse size, Minimum circuit ampacity, Indoor noise range, Liquid line size, Maximum elevation difference and more
- Air-Conditioning, Heating, and Refrigeration Institute: AHRI public detail 215387074 for CS-Z18AKUAW / CU-XZ18AKUACSourced - AHRI directory
Covers AHRI certification number, Rated cooling capacity, COP at 5F, EER2, Rated heating capacity, HSPF2 (Region 4) and more
- U.S. Environmental Protection Agency: ENERGY STAR exact Panasonic row for CS-Z18AKUAW / CU-XZ18AKUACSourced - Energy Star listing
Covers Energy Star status
Last updated
Jul 23, 2026