Pioneer / Quantum Ultra
Pioneer Quantum Ultra 18k R-454B 208/230V Mini-Split
The Quantum Ultra 18k covers an open-plan space or insulated garage at SEER2 23 with a -13F heating floor - a genuinely strong combination for the money, and two SEER2 points ahead of the best Diamante Pro at the same capacity. It is the system most buyers should land on for a mid-size room unless the climate demands the Hyperformance line's -22F, which costs half a SEER2 point here.
Refrigerant generation
R-454B - current-generation refrigerant
Paid link
$1,438 / Fresh price - checked Jul 24, 2026
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Image: Pioneer
- Last sourced
- Jul 24, 2026
SplitAtlas score
8.2 / 10
(23.0 SEER2) among 18k systems
(10.0 HSPF2) among 18k systems
(71.6% heat retained at 5F; -13 F heating floor) among 18k systems
(34 dBA indoor min / 53 dBA outdoor) among 18k systems
(6 verified features) across the catalogue
($1,438 median retail) among 18k systems
(6 manuals; spec sheet) across the catalogue
Not evaluated
- Installation accessibility — not applicable (professional install)N/A
professional install - DIY-accessibility not applicable
Key ratings
Buyer review snapshot
Best for / skip if
Best for
- High-efficiency shortlists; SEER2 is 23.
Install difficulty
- Electrical: 230V; breaker/fuse 20 A.
- Line set: connection type not sourced; max 65 ft.
Alternatives
- Blueridge XS6 Max Efficiency 18,000 BTU R-454B 208/230V (BXS6A18WM0 / BXS6A18UC0)
9.0 score / 18k / SEER2 25.6 / -22 F heating floor / 230V
Exact destination at Alpine Home Air: $2,359.00, checked Jul 24, 2026
- Senville ELITE 18,000 BTU R-454B 208/230V (SENE-18EL-IHH / SENE-18EL-OH)
8.9 score / 18k / SEER2 25.6 / -22 F heating floor / 187-253V
Exact destination at Senville: $1,899.99, checked Jul 24, 2026
- ACiQ Standard 18,000 BTU R-454B 208/230V (ACIQ-18WS-HP230C / ACIQ-18ZS-HP230C)
8.8 score / 18k / SEER2 24 / -13 F heating floor / 230V
Exact destination at HVACDirect: $1,299.99, checked Jul 26, 2026
Availability and price context
- Verified current price: $1,438.00 at Pioneer; availability in_stock; checked Jul 24, 2026.
Source date
- Model data sourced
- Jul 24, 2026
- Page reviewed
- Jul 23, 2026
- Source-backed records
- 5
- Newest source retrieved
- Jul 24, 2026
Warranty tiers
Warranty: Up to 10-year Pioneer warranty for registered eligible Quantum Ultra systems.
Model context
- Structured ratings
- Certification: ENERGY STAR certified and AHRI cold-climate designated. Refrigerant: current low-GWP R-454B. Minimum heating ambient: -13 F.
Strengths
- SEER2 23 with -13F rated heating.
- Two SEER2 points ahead of the Diamante Pro 18k.
Weaknesses
- Hyperformance 18k holds -22F for about half a SEER2 point.
- Budget for a qualified installer; Pioneer is pro-install.
Climate suitability
- Minimum heating ambient
- -13 F[2]
- Rated heating at 5F
- 13,600 BTU/h[4]
- Rated heating at 17F
- 15,000 BTU/h[4]
- Rated heating at 47F
- 19,000 BTU/h[4]
Specifications
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- Manufacturer
- Pioneer
- Brand
- Pioneer
- Product line
- Quantum Ultra
- Model number
- WT018GLSI24HLG indoor / YN018GLSI24RPG outdoor
- Indoor unit model
- WT018GLSI24HLG
- Outdoor unit model
- YN018GLSI24RPG
- Number of zones
- 1
- Max indoor units
- not published
- Rated cooling capacity
- 18,000 BTU/h[4]
- Rated heating capacity
- 19,000 BTU/h[4]
- Voltage
- 230 V[1]
- MCA
- not published - manufacturer specifies 20 A breaker
- Maximum fuse or breaker size
- 20 A[1]
- Breaker needed
- 20 A[1]
- SEER2
- 23 SEER2[4]
- EER2
- 12.5 EER2[4]
- HSPF2 (Region 4)
- 10 HSPF2[4]
- HSPF2 (Region 5)
- not published
- COP
- not published
- COP at 47F
- not published
- COP at 5F
- 1.8 COP[4]
- Minimum outdoor heating temperature
- -13 F[2]
- Minimum outdoor cooling temperature
- 5 F[2]
- Maximum outdoor temperature
- 131 F[2]
- Indoor noise range
- 50/47/43/38/34 dB(A)[2]
- Outdoor noise rating
- 53 dBA[1]
- Indoor weight
- 30.9 lb[1]
- Outdoor weight
- 90.4 lb[1]
- Refrigerant
- R-454B[4]
- Refrigerant charge
- not published
- Manufacturer coverage
- not published
- Line-set size
- 1/4 in liquid / 1/2 in suction
- Included line-set length
- Pioneer full-set product page offers no-kit plus multiple 10/16/25/33/50 ft line-set variants; no single included line-set length applies to the certified system pair.
- Maximum line-set length
- 65 ft[2]
- Max line set per indoor
- not published
- Maximum elevation difference
- 50 ft[2]
- Max height between indoor units
- not published
- Wi-Fi support
- supported[3]
- Energy Star status
- ENERGY STAR certified[5]
- AHRI certification number
- 217048752[4]
- Warranty
- Up to 10-year Pioneer warranty for registered eligible Quantum Ultra systems.
- Install path
- Professional install
- Retail price
- $1,438.00
- Available retailers
- Pioneer
- Manual links
- WYT018GLSI24RL AHRI certificate, WYT018GLSI24RL EnergyGuide, WYT24 installation manual, WYT24 service manual, WYT018GLSI24RL submittal sheet, WYT24 technical brochure
- Specification sheet
- WYT018GLSI24RL submittal sheet
- Last sourced date
- Jul 24, 2026
Retail purchase context
Some retailer links may earn us a commission at no extra cost; paid relationships never change scores or recommendations. Affiliate disclosure
Paid link
$1,438 / Fresh price - checked Jul 24, 2026
Electrical requirements
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Installation considerations
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- Liquid line
- 1/4 in[1]
- Suction line
- 1/2 in[1]
- Line connection type
- not published
- Precharged length
- not published
- Included line-set length
- Pioneer full-set product page offers no-kit plus multiple 10/16/25/33/50 ft line-set variants; no single included line-set length applies to the certified system pair.
- Maximum line-set length
- 65 ft[2]
- Max line set per indoor
- not published
- Max height between indoor units
- not published
- Indoor dimensions
- 43-1/8 x 8-3/4 x 13 in[1]
- Outdoor dimensions
- 36-1/2 x 15 x 27-1/2 in[1]
- Indoor weight
- 30.9 lb[1]
- Outdoor weight
- 90.4 lb[1]
- Drain size
- not published
Related systems and guides
- More Pioneer systems
- Pioneer Quantum Hyperformance 18k 230V
- Pioneer 230 V option
- Diamante Pro 18k
- Pioneer 230 V option
- Guide library
- Mini split buying guide
- Single-zone vs multi-zone mini splits
- Troubleshooting
- Do mini splits work in cold weather?
- Pioneer mini split review: is Pioneer any good?
- The best 18,000 BTU mini splits of 2026
- 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)
- Pioneer mini split not cooling
- Mini split not heating
- Mini split indoor unit freezing up
- Mini split weak airflow
- Mini split making loud noise
- Line sets
- Line-set covers
Frequently asked questions
- Can I install the Pioneer Quantum Ultra 18,000 BTU R-454B 208/230V (WT018GLSI24HLG / YN018GLSI24RPG) myself, or do I need a pro?
- Pioneer Quantum Ultra 18,000 BTU R-454B 208/230V (WT018GLSI24HLG / YN018GLSI24RPG) 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 Pioneer Quantum Ultra 18,000 BTU R-454B 208/230V (WT018GLSI24HLG / YN018GLSI24RPG) keep heating in a cold winter?
- The manufacturer publishes 13,600 BTU/h of heating output at 5F. Rated heating operation extends down to -13 F. Certified heating efficiency is 10 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 Pioneer Quantum Ultra 18,000 BTU R-454B 208/230V (WT018GLSI24HLG / YN018GLSI24RPG) need?
- Published electrical requirements: 230 V voltage, not published - manufacturer specifies 20 A breaker 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 65 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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- Pioneer Mini Split: Quantum Ultra WYT018GLSI24RL product pageSourced - manufacturer product page
Covers Breaker needed, Frequency, Maximum breaker size, Maximum fuse size, Phase, Voltage and more
- Pioneer / Parker Davis HVAC International, Inc.: WYT018GLSI24RL submittal sheetSourced - manufacturer technical document
Covers Maximum cooling current, Maximum heating current, Indoor noise range, Maximum elevation difference, Maximum line-set length, Minimum outdoor cooling temperature and more
- Pioneer Mini Split: Pioneer wall-mounted mini-split model comparison guideSourced - manufacturer product page
Covers Wi-Fi support, Legacy compressor warranty value, Legacy warranty value, Warranty notes
- Air-Conditioning, Heating, and Refrigeration Institute: AHRI Appendix M1 public row for YN018GLSI24RPG / WT018GLSI24HLGSourced - AHRI directory
Covers AHRI certification number, performance_spec.cold_climate_designation, Rated cooling capacity, COP at 5F, EER2, Rated heating capacity and more
- ENERGY STAR: ENERGY STAR exact row check for AHRI 217048752Sourced - Energy Star listing
Covers Energy Star status
Last updated
Jul 23, 2026