TOSOT / Multi Ultra Heat
TOSOT Multi Ultra Heat 55k R-32 208/230V 6-Zone Mini-Split
The TOSOT Multi Ultra Heat 6-zone is the top of the line: up to six rooms from one 208/230V outdoor unit on R-32, ENERGY STAR certified, at a certified nominal SEER2 of 21 (EER2 11.65, HSPF2 10). Unlike the smaller Multi Ultra Heat units, the 6-zone is not AHRI cold-climate designated, so treat it as broad-coverage rather than a hard-freeze specialist.
Its certified heating is rated 55000 BTU at 47F, 41000 at 17F, and 36400 at 5F, tapering through deep cold. That certified SEER2 is the all-non-ducted nominal and depends on the heads you attach.
TOSOT is a value brand (TOSOT/Gree family) sold on tosot.com, professionally installed and priced by quote.
Refrigerant generation
R-32 - current-generation refrigerant
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Image: TOSOT
- Last sourced
- Jul 29, 2026
SplitAtlas score
7.9 / 10
(21.0 SEER2) among >36k systems
(10.0 HSPF2) among >36k systems
(66.2% heat retained at 5F; -22 F heating floor) among >36k systems
(10 yr parts / 10 yr compressor) across the catalogue
(3 verified features) across the catalogue
(6 manuals; spec sheet; 14 error-code rows) 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
- 6-zone projects in the 54k outdoor capacity class.
Install difficulty
- Electrical: 230V; MCA 37.5 A; breaker/fuse 40 A.
- Line set: connection type not sourced; precharged 197 ft; max 394 ft.
- 6-zone condenser; indoor-head matching and branch layout are part of the job.
Availability and price context
We could not verify a current retail price for this model. These TOSOT/Cosmo multi-zone systems are professional-install equipment, so we link to contractor quotes rather than a retail price.
Source date
- Model data sourced
- Jul 29, 2026
- Page reviewed
- Jul 29, 2026
- Source-backed records
- 5
- Newest source retrieved
- Jul 29, 2026
Warranty tiers
Warranty: 10 years parts and compressor as standard.
Model context
- Install path
- This is professional-install equipment; no verified current retail offer is attached.
Strengths
- Six zones of coverage and 55000 BTU of 47F heating from a single outdoor unit.
- ENERGY STAR certified on current R-32 refrigerant at a value price.
- One 208/230V circuit for up to six rooms.
Weaknesses
- Not AHRI cold-climate designated, and heating tapers to 36400 BTU at 5F - size for deep cold carefully.
- Six-zone total capacity is shared and modest per room; size heads carefully.
Climate suitability
- Minimum heating ambient
- -22 F[1]
- Rated heating at 5F
- 36,400 BTU/hNon-Ducted Indoor Units[2]
- Rated heating at 17F
- 41,000 BTU/hNon-Ducted Indoor Units[2]
- Rated heating at 47F
- 55,000 BTU/hNon-Ducted Indoor Units[2]
Specifications
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- Manufacturer
- TOSOT
- Brand
- TOSOT
- Product line
- Multi Ultra Heat
- Model number
- TMH60D32MO
- Indoor unit model
- Indoor heads are selected separately on a multi-zone system
- Outdoor unit model
- TMH60D32MO
- Number of zones
- 6
- Max indoor units
- 6 units[1]
- Rated cooling capacity
- 55,000 BTU/hNon-Ducted Indoor Units[2]
- Rated heating capacity
- 55,000 BTU/hNon-Ducted Indoor Units[2]
- Voltage
- 230 V[1]
- MCA
- 37.5 A[1]
- Maximum fuse or breaker size
- 40 A[1]
- Breaker needed
- not published
- SEER2
- 21 SEER2Non-Ducted Indoor Units[2]
- EER2
- 11.65 EER2Non-Ducted Indoor Units[2]
- HSPF2 (Region 4)
- 10 HSPF2Non-Ducted Indoor Units[2]
- HSPF2 (Region 5)
- Certified per indoor-unit combination, not per outdoor unit
- COP
- not published
- COP at 47F
- not published
- COP at 5F
- 1.9 COPNon-Ducted Indoor Units[2]
- Minimum outdoor heating temperature
- -22 F[1]
- Minimum outdoor cooling temperature
- -22 F[1]
- Maximum outdoor temperature
- 118 F[1]
- Indoor noise range
- Indoor heads are selected separately on a multi-zone system
- Outdoor noise rating
- 54 dBA[1]
- Indoor weight
- Indoor heads are selected separately on a multi-zone system
- Outdoor weight
- 225 lb[1]
- Refrigerant
- R-32[2]
- Refrigerant charge
- 112.88 oz[1]
- Manufacturer coverage
- not published
- Line-set size
- 1/4 in ports A-E; allowable indoor units 1-6 liquid / 1/2 in x 2 and 3/8 in x 3; allowable indoor units 1-6 suction
- Included line-set length
- Indoor heads are selected separately on a multi-zone system
- Maximum line-set length
- 394 ft[1]
- Max line set per indoor
- 82 ft[1]
- Maximum elevation difference
- 82 ft[1]
- Max height between indoor units
- 82 ft[1]
- Wi-Fi support
- Indoor heads are selected separately on a multi-zone system
- Energy Star status
- ENERGY STAR certified[3]
- AHRI certification number
- 217994526Non-Ducted Indoor Units[2]
- Warranty
- Standard: 10 yr parts / 10 yr compressor (equipment sold and installed by licensed professionals in residential applications). TOSOT warranty information lists a standard 10-year compressor warranty and 10-year parts warranty for equipment sold and installed by licensed professionals in residential applications.
- Install path
- Professional install
- Retail price
- These TOSOT/Cosmo multi-zone systems are professional-install equipment, so we link to contractor quotes rather than a retail price.
- Available retailers
- not published
- Manual links
- AHRI public detail 217994526, ENERGY STAR exact AHRI rows 217994526, TOSOT Multi Ultra Heat / TMH60D32MO current product page, Lead-gen/no-retail audit for TMH60D32MO, TMH60D32MO TOSOT Multi Ultra Heat submittal, TOSOT warranty information
- Specification sheet
- TMH60D32MO TOSOT Multi Ultra Heat submittal
- Last sourced date
- Jul 29, 2026
Installation considerations
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- Liquid line
- 1/4 in ports A-E; allowable indoor units 1-6[1]
- Suction line
- 1/2 in x 2 and 3/8 in x 3; allowable indoor units 1-6[1]
- Line connection type
- not published
- Precharged length
- 197 ft[1]
- Included line-set length
- Indoor heads are selected separately on a multi-zone system
- Maximum line-set length
- 394 ft[1]
- Max line set per indoor
- 82 ft[1]
- Max height between indoor units
- 82 ft[1]
- Indoor dimensions
- Indoor heads are selected separately on a multi-zone system
- Outdoor dimensions
- 38-55/64 x 16-7/32 x 49-49/64 in[1]
- Indoor weight
- Indoor heads are selected separately on a multi-zone system
- Outdoor weight
- 225 lb[1]
- Drain size
- not published
Related systems and guides
- More TOSOT systems
- GREE comparison model
- Cooper & Hunter Slim Duct 58k 230V
- TOSOT sibling model
- TOSOT 42k model
- Guide library
- Mini split buying guide
- Single-zone vs multi-zone mini splits
- Troubleshooting
- Do mini splits work in cold weather?
- The best multi-zone mini splits of 2026
- The best 4-zone mini splits of 2026
- How to size a multi-zone mini split
- Not every multi-zone condenser lets you mix head types
- How much does a multi-zone mini split cost?
- 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
- One room won't heat or cool on a multi-zone mini split
- Mini split not heating
- Mini split indoor unit freezing up
- Your mini split is showing a refrigerant leak code
- Mini split remote not working
- Line sets
- Line-set covers
Frequently asked questions
- Can I install the TOSOT Multi Ultra Heat 6-Zone 55,000 BTU R-32 208/230V (TMH60D32MO) myself, or do I need a pro?
- TOSOT Multi Ultra Heat 6-Zone 55,000 BTU R-32 208/230V (TMH60D32MO) 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 TOSOT Multi Ultra Heat 6-Zone 55,000 BTU R-32 208/230V (TMH60D32MO) keep heating in a cold winter?
- The manufacturer publishes 36,400 BTU/h of heating output at 5F. Rated heating operation extends down to -22 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 TOSOT Multi Ultra Heat 6-Zone 55,000 BTU R-32 208/230V (TMH60D32MO) need?
- Published electrical requirements: 230 V voltage, 37.5 A minimum circuit ampacity, and 40 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 394 ft, and the included line set comes pre-charged for 197 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 TOSOT Multi Ultra Heat 6-Zone 55,000 BTU R-32 208/230V (TMH60D32MO) carry?
- The manufacturer publishes these warranty tiers: Standard: 10 yr parts / 10 yr compressor (equipment sold and installed by licensed professionals in residential applications). Registration requirements and proof of qualified installation commonly affect coverage, so read the warranty terms before install day.
Data sources
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- TOSOT: TMH60D32MO TOSOT Multi Ultra Heat submittalSourced - manufacturer technical document
Covers Frequency, electrical_spec.guaranteed_voltage_range, Maximum breaker size, Maximum fuse size, Minimum circuit ampacity, Phase and more
- AHRI certificate #217994526 - search the AHRI DirectorySourced - 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 215735288Sourced - Energy Star listing
Covers performance_spec.energy_star_cold_climate, Energy Star status
- TOSOT: TOSOT Multi Ultra Heat / TMH60D32MO current product evidenceSourced - manufacturer product page
Covers product_line.name
- TOSOT: TOSOT warranty informationSourced - manufacturer product page
Covers Legacy compressor warranty value, Legacy warranty value, Standard compressor warranty, Standard warranty conditions, Standard parts warranty, Warranty notes
Last updated
Jul 29, 2026