How far can the outdoor unit be from the indoor head?

The published maximum line-set length is 100 ft. The outdoor unit's factory charge covers up to 25 ft of line; longer runs need added refrigerant. Measure the planned routing before ordering.

Mitsubishi Electric / M-Series FS

Mitsubishi M-Series FS 15k R-410A 208/230V Mini-Split

Certified capacity: 14,000 BTU/h[2]
SEER2: 22.3 SEER2[2]
Heating floor: -13 F[1]
Voltage: 208/230V[1]
Install path: Professional install

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.

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Error Codes

Mitsubishi Electric M-Series FS 15,000 BTU R-410A 208/230V (MSZ-FS15NA / MUZ-FS15NAH)

Image: Mitsubishi Electric

Data completeness: 95%

Last sourced: Jul 23, 2026

SplitAtlas score

8.9 / 10

Methodology

Cooling efficiencyAbove average

(22.3 SEER2) among 12k systems

Heating efficiencyTop quartile

(9.9 HSPF2) among 12k systems

Cold-weather performanceTop 10%

(5F certified capacity: 100% of the 47F rating; -13 F heating floor) among 12k systems

WarrantyTop quartile

(10 yr parts / 10 yr compressor) across the catalogue

Feature setBottom quartile

(1 verified feature) across the catalogue

Documentation & partsTop quartile

(9 manuals; spec sheet; parts channel) 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

Rated cooling

14,000BTU/h[2]

Rated heating

16,000BTU/h[2]

Buyer review snapshot

Best for / skip if

Best for

High-efficiency shortlists; SEER2 is 22.3.

Skip if

You are shopping for a current-generation recommendation; catalog lifecycle is LEGACY.

Install difficulty

Professional install

Electrical: 208/230V; MCA 18 A; breaker/fuse 20 A.
Line set: connection type not sourced; precharged 25 ft; max 100 ft.

Alternatives

Blueridge XS6 Max Efficiency 12,000 BTU R-454B 208/230V (BXS6A12WM0 / BXS6A12UC0)
9.0 score / 12k / SEER2 29.4 / -22 F heating floor / 230V
Exact destination at Alpine Home Air: $1,979.00, checked Jul 24, 2026

Availability and price context

This system needs a professional install, so its real price is an installed quote that depends on your home. We don't link to a listing for this exact model; get installation quotes to price it.

Source date

Model data sourced: Jul 23, 2026
Page reviewed: Jul 23, 2026
Source-backed records: 5
Newest source retrieved: Sep 12, 2026

Warranty tiers

Base: 5 yr parts / 7 yr compressor - licensed HVAC contractor installation
Registered: 10 yr parts / 10 yr compressor - owner-occupied residence registered within 90 days of installation
Program: 12 yr parts / 12 yr compressor - owner-occupied residence installed and registered by a Diamond Contractor within 90 days

The score uses Registered. Additional published terms are shown for reference and not counted in the score.

Review methodology

Model context

Mitsubishi dealer channel: Mitsubishi Electric equipment is sold through its dealer network; installed price depends on the local contractor.
Install path: This is professional-install equipment; price it with an installed quote.
Structured ratings: Certification: ENERGY STAR certified and AHRI cold-climate designated. Refrigerant: R-410A. Minimum heating ambient: -13 F.

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.

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.

Climate suitability

Minimum heating ambient: -13 F[1]
Heating capacity at −13°F: 14,400 BTU/h[3]
Certified heating at 5F: 19,400 BTU/h[2]
Maximum heating at 5F (manufacturer): 19,360 BTU/h[1]
Rated heating at 17F: 10,000 BTU/h[2]
Rated heating at 47F: 16,000 BTU/h[2]

Specifications

Show

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/h[2]
Rated heating capacity: 16,000 BTU/h[2]
Voltage: 208/230V[1]
MCA: 18 A[1]
Maximum fuse or breaker size: 20 A[1]
Breaker needed: not published
SEER2: 22.3 SEER2[2]
EER2: 14 EER2[2]
HSPF2 (Region 4): 9.9 HSPF2[2]
HSPF2 (Region 5): not published
COP: not published
COP at 47F: 4.06 COP[1]
COP at 5F: 2 COP[2]
Minimum outdoor heating temperature: -13 F[1]
Minimum outdoor cooling temperature: 14 F[1]
Maximum outdoor temperature: 115 F[1]
Indoor noise range: not published
Outdoor noise rating: 55 dBA[1]
Indoor weight: 29 lb[1]
Outdoor weight: 118 lb[1]
Refrigerant: R-410A[2]
Refrigerant charge: 55 oz[1]
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 ft[1]
Max line set per indoor: not published
Maximum elevation difference: 50 ft[1]
Max height between indoor units: not published
Wi-Fi support: supported[1]
Energy Star status: ENERGY STAR certified[2]
AHRI certification number: 209832206[2]
Warranty: Base: 5 yr parts / 7 yr compressor (licensed HVAC contractor installation); Registered: 10 yr parts / 10 yr compressor (owner-occupied residence registered within 90 days of installation); Program: 12 yr parts / 12 yr compressor (owner-occupied residence installed and registered by a Diamond Contractor within 90 days). Score uses Registered. Additional published terms are shown for reference and not counted in the score.. 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.
Install path: Professional install
Retail price: Installed quote only
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, 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 sourced date: Jul 23, 2026

Parts and filters

Fits Mitsubishi Electric M-Series FS 15,000 BTU R-410A 208/230V (MSZ-FS15NA / MUZ-FS15NAH). Part numbers and fit notes identify compatibility only; no manufacturer endorsement is implied.

filter-anti-allergy

Mitsubishi electro static anti-allergy enzyme filter

Fits: Mitsubishi Electric M-Series FS 15,000 BTU R-410A 208/230V (MSZ-FS15NA / MUZ-FS15NAH)
OEM part number: MAC-2330FT-E
Filter care: Replace every year; vacuum every 3 months in between; if dirt remains, soak and rinse in lukewarm water, then shade-dry.
Fit note: Fits MSZ-FS15NA / MUZ-FS15NAH. Manufacturer documentation publishes this OEM part number for this model family. No live HVACDirect exact-part offer was found; source through an authorized Mitsubishi Electric dealer with the model and serial number.
Source: Mitsubishi Electric MSZ-FS06NA / MUZ-FS06NAH Submittal, INDOOR UNIT ACCESSORIES: MSZ-FS06NA, page p. 4 (Electro Static Anti-allergy Enzyme Filter MAC-2330FT-E)

filter-deodorizing