Pioneer / Diamante Pro
Pioneer Diamante Pro 9k R-454B 115V Mini-Split
The Diamante Pro 9k on 115V is the plug-into-a-normal-circuit option in Pioneer's mid tier, which is the main reason to choose it - no new 230V run means a materially cheaper install. SEER2 19 and a -4F heating floor put it above the Essenza line and below Quantum.
For a small bedroom or office in a moderate climate that is a sensible middle. If the room ever needs to hold heat below freezing, the Quantum Ultra 9k 115V keeps the same circuit and adds nine degrees.
Refrigerant generation
R-454B - current-generation refrigerant
Paid link
$858 / Fresh price - checked Jul 24, 2026
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Image: Pioneer
- Last sourced
- Jul 24, 2026
SplitAtlas score
7.5 / 10
(19.0 SEER2) among <=9k systems
(9.5 HSPF2) among <=9k systems
(73% heat retained at 5F; -4 F heating floor) among <=9k systems
(28 dBA indoor min / 54 dBA outdoor) among <=9k systems
(6 verified features) across the catalogue
($858 median retail) among <=9k 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
Install difficulty
- Electrical: 115V; breaker/fuse 25 A.
- Line set: connection type not sourced; included 16 ft; max 50 ft.
Alternatives
- Blueridge XS6 Max Efficiency 9,000 BTU R-454B 208/230V (BXS6A09WM0 / BXS6A09UC0)
8.9 score / 9k / SEER2 33.3 / -22 F heating floor / 230V
Exact destination at Alpine Home Air: $1,689.00, checked Jul 24, 2026
- Senville ELITE 9,000 BTU R-454B 208/230V (SENE-09EL-IHH / SENE-09EL-OH)
8.8 score / 9k / SEER2 33.3 / -22 F heating floor / 187-253V
Exact destination at Senville: $1,599.99, checked Jul 24, 2026
- ACiQ Extreme 9,000 BTU R-454B 208/230V (ACIQ-09W-HH-MD / ACIQ-09ZPL-HP230C)
8.8 score / 9k / SEER2 27.4 / -22 F heating floor / 230V
Exact destination at HVACDirect: $1,499.99, checked Jul 26, 2026
Availability and price context
- Verified current price: $858.00 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 5-year Pioneer warranty for registered eligible Diamante Pro systems.
Model context
- Structured ratings
- Certification: ENERGY STAR certified and AHRI cold-climate designated. Refrigerant: current low-GWP R-454B. Minimum heating ambient: -4 F.
Strengths
- 115V, so no new circuit and a cheaper install.
- Current R-454B refrigerant.
- -4F rated heating, well ahead of the Essenza line.
Weaknesses
- SEER2 19 is the lowest in the Diamante Pro line.
- Quantum Ultra 9k is also 115V and holds -13F for a modest step up.
Climate suitability
- Minimum heating ambient
- -4 F[2]
- Rated heating at 5F
- 7,300 BTU/h[4]
- Rated heating at 17F
- 8,000 BTU/h[4]
- Rated heating at 47F
- 10,000 BTU/h[4]
Specifications
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- Manufacturer
- Pioneer
- Brand
- Pioneer
- Product line
- Diamante Pro
- Model number
- WT009ALSI20HLF indoor / YN009ALSI20RPF outdoor
- Indoor unit model
- WT009ALSI20HLF
- Outdoor unit model
- YN009ALSI20RPF
- Number of zones
- 1
- Max indoor units
- not published
- Rated cooling capacity
- 9,000 BTU/h[4]
- Rated heating capacity
- 10,000 BTU/h[4]
- Voltage
- 115 V[1]
- MCA
- not published - manufacturer specifies 25 A breaker
- Maximum fuse or breaker size
- 25 A[1]
- Breaker needed
- 25 A[1]
- SEER2
- 19 SEER2[4]
- EER2
- 11.7 EER2[4]
- HSPF2 (Region 4)
- 9.5 HSPF2[4]
- HSPF2 (Region 5)
- not published
- COP
- not published
- COP at 47F
- not published
- COP at 5F
- 1.9 COP[4]
- Minimum outdoor heating temperature
- -4 F[2]
- Minimum outdoor cooling temperature
- 5 F[2]
- Maximum outdoor temperature
- 122 F[2]
- Indoor noise range
- 42/40/35/30/28 dB(A)[2]
- Outdoor noise rating
- 54 dBA[1]
- Indoor weight
- 19.8 lb[1]
- Outdoor weight
- 51.8 lb[1]
- Refrigerant
- R-454B[4]
- Refrigerant charge
- not published
- Manufacturer coverage
- not published
- Line-set size
- 1/4 in liquid / 3/8 in suction
- Included line-set length
- 16 ft[1]
- Maximum line-set length
- 50 ft[2]
- Max line set per indoor
- not published
- Maximum elevation difference
- 33 ft[2]
- Max height between indoor units
- not published
- Wi-Fi support
- supported[3]
- Energy Star status
- ENERGY STAR certified[5]
- AHRI certification number
- 217048740[4]
- Warranty
- Up to 5-year Pioneer warranty for registered eligible Diamante Pro systems.
- Install path
- Professional install
- Retail price
- $858.00
- Available retailers
- Pioneer
- Manual links
- WYT009ALSI20RL AHRI certificate, WYT009ALSI20RL EnergyGuide, WYT20 installation manual, WYT20 service manual, WYT009ALSI20RL submittal sheet, WYT20 technical brochure
- Specification sheet
- WYT009ALSI20RL 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
$858 / 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
- 3/8 in[1]
- Line connection type
- not published
- Precharged length
- not published
- Included line-set length
- 16 ft[1]
- Maximum line-set length
- 50 ft[2]
- Max line set per indoor
- not published
- Max height between indoor units
- not published
- Indoor dimensions
- 31-7/8 x 8 x 11-1/2 in[1]
- Outdoor dimensions
- 31 x 11-1/2 x 19-3/8 in[1]
- Indoor weight
- 19.8 lb[1]
- Outdoor weight
- 51.8 lb[1]
- Drain size
- not published
Related systems and guides
- More Pioneer systems
- Perfect Aire Quick Connect 9k
- Diamante Pro 9k
- Quantum Hyperformance 9k
- Panasonic Project Series High Wall 9k 230V
- Guide library
- Mini split buying guide
- Single-zone vs multi-zone mini splits
- Troubleshooting
- Pioneer mini split review: is Pioneer any good?
- The best 9,000 BTU mini splits of 2026
- 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
- Mini split for a hot upstairs
- Mini splits for an ADU or tiny home
- Mini splits for new construction
- Pioneer mini split not cooling
- Mini split remote not working
- Mini split Wi-Fi not connecting
- Mini split smells bad
- Line sets
- Line-set covers
Frequently asked questions
- Can I install the Pioneer Diamante Pro 9,000 BTU R-454B 115V (WT009ALSI20HLF / YN009ALSI20RPF) myself, or do I need a pro?
- Pioneer Diamante Pro 9,000 BTU R-454B 115V (WT009ALSI20HLF / YN009ALSI20RPF) 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 Diamante Pro 9,000 BTU R-454B 115V (WT009ALSI20HLF / YN009ALSI20RPF) keep heating in a cold winter?
- The manufacturer publishes 7,300 BTU/h of heating output at 5F. Rated heating operation extends down to -4 F. Certified heating efficiency is 9.5 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 Diamante Pro 9,000 BTU R-454B 115V (WT009ALSI20HLF / YN009ALSI20RPF) need?
- Published electrical requirements: 115 V voltage, not published - manufacturer specifies 25 A breaker minimum circuit ampacity, and 25 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 50 ft, and the included line set comes pre-charged for 16 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: Diamante Pro WYT009ALSI20RL 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.: WYT009ALSI20RL 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 YN009ALSI20RPF / WT009ALSI20HLFSourced - 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 217048740Sourced - Energy Star listing
Covers Energy Star status
Last updated
Jul 23, 2026