Mitsubishi Electric / M-Series FS
Mitsubishi Electric M-Series FS 15,000 BTU R-410A 208/230V (MSZ-FS15NA / MUZ-FS15NAH)
Model data is drawn from manufacturer, retailer, and certification sources. Missing specifications remain marked as not published.
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Data completeness: 95%
- Last verified
- Jul 23, 2026
SplitAtlas score
8.2 / 10
Cooling efficiency29.3
Heating efficiency47.0
Cold-weather performance100.0
Noise100.0
Warranty5.0
Feature set0.0
Documentation & parts50.0
Not evaluated
- Installation accessibility — not applicable (professional install)N/A
professional install - DIY-accessibility not applicable
- Price-to-value — not evaluatedN/A
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Mitsubishi Electric M-Series FS 15,000 BTU R-410A 208/230V (MSZ-FS15NA / MUZ-FS15NAH) review summary
The M-Series FS 15k is a discontinued (Production Stopped) R-410A Hyper-Heat system rated at SEER2 22.3, EER2 14, HSPF2 9.9, with 16,000 BTU of heat at 47F and a strong 19,400 BTU at 5F. It was Mitsubishi's premium 1.25-ton cold-climate single-zone; new buyers should look to the current R-454B FX 15k, which succeeds it.
Rated cooling
14,000BTU/hVerified - AHRI directory
Rated heating
16,000BTU/hVerified - AHRI directory
Mitsubishi Electric M-Series FS 15,000 BTU R-410A 208/230V (MSZ-FS15NA / MUZ-FS15NAH) best-fit use cases
Owners of an existing FS 15k, or buyers who find remaining stock and want strong deep-cold heating - otherwise choose the current FX 15k.
Where this system ranks
Mitsubishi Electric M-Series FS 15,000 BTU R-410A 208/230V (MSZ-FS15NA / MUZ-FS15NAH) specifications
- Manufacturer
- Mitsubishi Electric
- Brand
- Mitsubishi Electric
- Product line
- M-Series FS
- Model number
- MSZ-FS15NA-U1 indoor / MUZ-FS15NAH-U1 outdoor
- Indoor unit model
- MSZ-FS15NA-U1
- Outdoor unit model
- MUZ-FS15NAH-U1
- Number of zones
- 1
- Max indoor units
- not published
- Rated cooling capacity
- 14,000 BTU/hVerified - AHRI directory
- Rated heating capacity
- 16,000 BTU/hVerified - AHRI directory
- Voltage
- 208/230VVerified - manufacturer technical document
- MCA
- 18 AVerified - manufacturer technical document
- Maximum fuse or breaker size
- 20 AVerified - manufacturer technical document
- Breaker needed
- not published
- SEER2
- 22.3 SEER2Verified - AHRI directory
- EER2
- 14 EER2Verified - AHRI directory
- HSPF2 (Region 4)
- 9.9 HSPF2Verified - AHRI directory
- HSPF2 (Region 5)
- not published
- COP
- not published
- COP at 47F
- 4.06 COPVerified - manufacturer technical document
- COP at 5F
- 2 COPVerified - AHRI directory
- Minimum outdoor heating temperature
- -13 FVerified - manufacturer technical document
- Minimum outdoor cooling temperature
- 14 FVerified - manufacturer technical document
- Maximum outdoor temperature
- 115 FVerified - manufacturer technical document
- Indoor noise range
- cooling 27-31-35-39-44; heating 25-31-37-40-46Verified - manufacturer technical document
- Outdoor noise rating
- 55 dBAVerified - manufacturer technical document
- Indoor weight
- 29 lbVerified - manufacturer technical document
- Outdoor weight
- 118 lbVerified - manufacturer technical document
- Refrigerant
- R-410AVerified - AHRI directory
- Refrigerant charge
- 55 ozVerified - manufacturer technical document
- Manufacturer coverage
- not published
- Line-set size
- 1/4 in liquid / 1/2 in suction
- Included line-set length
- Mitsubishi submittals publish line-size and maximum/precharged piping data; the installer supplies the line set.
- Maximum line-set length
- 100 ftVerified - manufacturer technical document
- Max line set per indoor
- not published
- Maximum elevation difference
- 50 ftVerified - manufacturer technical document
- Max height between indoor units
- not published
- Wi-Fi support
- supportedVerified - manufacturer technical document
- Energy Star status
- certifiedVerified - AHRI directory
- AHRI certification number
- 209832206Verified - AHRI directory
- Warranty
- 5 years parts / 7 years compressor. Standard residential M-Series warranty is 5 years parts and 7 years compressor from installation by a licensed HVAC contractor. Enhanced residential terms are 10 years parts and compressor for an owner-occupied residence registered within 90 days of installation, and 12 years parts and compressor when installed in an owner-occupied residence by a Diamond Contractor and registered by that Diamond Contractor within 90 days.
- DIY installation status
- Professional install
- Retail price
- HVACDirect exact model search returned 403 and no exact product page with visible price was retrieved on 2026-07-23.
- Installation type
- Professional install
- Available retailers
- not published
- Manual links
- AHRI certificate 209832206, AHRI public detail 209832206, ENERGY STAR exact row for AHRI 209832206, M-Series FS Mitsubishi Comfort product page, M-Series FS Mitsubishi Comfort product page, MitsubishiPro product record MUZ-FS15NAH-U1, HVACDirect exact search for MSZ-FS15NA / MUZ-FS15NAH, MSZ-FS15NA & MUZ-FS15NAH Mitsubishi Electric submittal, METUS Residential M-Series, P-Series and SMART MULTI Limited Warranty Statement
- Specification sheet
- MSZ-FS15NA & MUZ-FS15NAH Mitsubishi Electric submittal
- Last verified date
- Jul 23, 2026
Mitsubishi Electric M-Series FS 15,000 BTU R-410A 208/230V (MSZ-FS15NA / MUZ-FS15NAH) strengths
- 19,400 BTU of heat at 5F - excellent deep-cold output for the size.
- SEER2 22.3 / HSPF2 9.9 with true Hyper-Heat operation.
- Mitsubishi dealer support and reliability reputation.
Mitsubishi Electric M-Series FS 15,000 BTU R-410A 208/230V (MSZ-FS15NA / MUZ-FS15NAH) weaknesses
- Production Stopped and R-410A - phase-out refrigerant; sourcing and service will get harder.
- The current FX 15k (R-454B) is the recommended new-purchase equivalent.
- Premium price; professional dealer installation required.
Mitsubishi Electric M-Series FS 15,000 BTU R-410A 208/230V (MSZ-FS15NA / MUZ-FS15NAH) climate suitability
- Minimum heating ambient
- -13 FVerified - manufacturer technical document
- Rated heating at 5F
- 19,400 BTU/hVerified - AHRI directory
- Rated heating at 17F
- 10,000 BTU/hVerified - AHRI directory
- Rated heating at 47F
- 16,000 BTU/hVerified - AHRI directory
Mitsubishi Electric M-Series FS 15,000 BTU R-410A 208/230V (MSZ-FS15NA / MUZ-FS15NAH) electrical requirements
- Voltage
- not published
- Voltage range
- 208/230VVerified - manufacturer technical document
- Phase
- 1Verified - manufacturer technical document
- Frequency
- 60 HzVerified - manufacturer technical document
- MCA
- 18 AVerified - manufacturer technical document
- Breaker needed
- not published
- Maximum breaker size
- not published
- Maximum fuse size
- 20 AVerified - manufacturer technical document
- Maximum cooling current
- not published
- Maximum heating current
- not published
- Manufacturer wire notes
- 14 AWG indoor-outdoorVerified - manufacturer technical document
Mitsubishi Electric M-Series FS 15,000 BTU R-410A 208/230V (MSZ-FS15NA / MUZ-FS15NAH) installation considerations
- Liquid line
- 1/4 inVerified - manufacturer technical document
- Suction line
- 1/2 inVerified - manufacturer technical document
- Precharged length
- 25 ftVerified - manufacturer technical document
- Included line-set length
- Mitsubishi submittals publish line-size and maximum/precharged piping data; the installer supplies the line set.
- Maximum line-set length
- 100 ftVerified - manufacturer technical document
- Max line set per indoor
- not published
- Max height between indoor units
- not published
- Indoor dimensions
- 36-7/16 x 9-3/16 x 12 inVerified - manufacturer technical document
- Outdoor dimensions
- 33-1/16 x 13 x 34-5/8 inVerified - manufacturer technical document
- Indoor weight
- 29 lbVerified - manufacturer technical document
- Outdoor weight
- 118 lbVerified - manufacturer technical document
- Drain size
- 5/8 inVerified - manufacturer technical document
Mitsubishi Electric M-Series FS 15,000 BTU R-410A 208/230V (MSZ-FS15NA / MUZ-FS15NAH) related systems and guides
- More Mitsubishi Electric systems
- Mitsubishi Electric M-Series GS 15,000 BTU R-410A 208/230V (MSZ-GS15NA / MUZ-GS15NA)
- Mitsubishi Electric M-Series GS Hyper-Heat 15,000 BTU R-410A 208/230V (MSZ-GS15NA / MUZ-GS15NAHZ)
- Mitsubishi Electric M-Series GX 15,000 BTU R-454B 208/230V (MSZ-GX15NL / MUZ-GX15NL)
- Mitsubishi Electric M-Series GX Hyper-Heat 15,000 BTU R-454B 208/230V (MSZ-GX15NL / MUZ-GX15NLHZ)
- Buying guide
- Single vs multi-zone
- Cold-weather performance
Frequently asked questions
- Can I install the Mitsubishi Electric M-Series FS 15,000 BTU R-410A 208/230V (MSZ-FS15NA / MUZ-FS15NAH) myself, or do I need a pro?
- Mitsubishi Electric M-Series FS 15,000 BTU R-410A 208/230V (MSZ-FS15NA / MUZ-FS15NAH) 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 Mitsubishi Electric M-Series FS 15,000 BTU R-410A 208/230V (MSZ-FS15NA / MUZ-FS15NAH) keep heating in a cold winter?
- The manufacturer publishes 19,400 BTU/h of heating output at 5F. Rated heating operation extends down to -13 F. Certified heating efficiency is 9.9 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 Mitsubishi Electric M-Series FS 15,000 BTU R-410A 208/230V (MSZ-FS15NA / MUZ-FS15NAH) need?
- Published electrical requirements: 208/230V voltage, 18 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.
- What warranty does the Mitsubishi Electric M-Series FS 15,000 BTU R-410A 208/230V (MSZ-FS15NA / MUZ-FS15NAH) carry?
- The manufacturer publishes 5 years parts coverage and 7 years compressor coverage. Registration requirements and proof of qualified installation commonly affect coverage, so read the warranty terms before install day.
Mitsubishi Electric M-Series FS 15,000 BTU R-410A 208/230V (MSZ-FS15NA / MUZ-FS15NAH) data sources
- Mitsubishi Electric Trane HVAC US LLC: MSZ-FS15NA & MUZ-FS15NAH Mitsubishi Electric M-Series FS submittalVerified - manufacturer technical document
Covers Frequency, electrical_spec.guaranteed_voltage_range, electrical_spec.indoor_mca_amps, Maximum fuse size, Minimum circuit ampacity, Phase and more
- Air-Conditioning, Heating, and Refrigeration Institute: AHRI public detail 209832206 for MSZ-FS15NA / MUZ-FS15NAHVerified - AHRI directory
Covers AHRI certification number, Rated cooling capacity, COP at 5F, EER2, Energy Star status, Rated heating capacity and more
- Mitsubishi Electric Trane HVAC US LLC: MitsubishiPro product record MUZ-FS15NAH-U1Verified - manufacturer product page
Covers system.lifecycle_status
- Mitsubishi Electric Trane HVAC US LLC: Residential M-Series, P-Series and SMART MULTI Split Air Conditioner and Heat Pump Systems Limited Warranty StatementVerified - manufacturer technical document
Covers Compressor warranty, Parts warranty, Warranty notes
Mitsubishi Electric M-Series FS 15,000 BTU R-410A 208/230V (MSZ-FS15NA / MUZ-FS15NAH) last updated
Jul 23, 2026