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Bosch / Climate 5000 Model C legacy R-410A

Bosch Climate 5000 Model C Legacy 12k Regular R-410A 115V Mini-Split

Certified capacity
12,000 BTU/h[2]
SEER2
23.5 SEER2[2]
Heating floor
-13 F[1]
Voltage
115 V[1]
Install path
Professional install

This is a legacy 12k head from the older R-410A generation, wired for 115V. It carries a SEER2 of 23.5, EER2 of 13, and HSPF2 of 10, with heating of 12,000 BTU at 47F, 8,400 BTU at 17F, and 6,800 BTU at 5F. It remains a valid, AHRI-certified, ENERGY STAR unit, but it runs a refrigerant now being phased down.

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Error Codes
Bosch Climate 5000 Model C legacy R-410A wall-mounted indoor unit (BMS500-AAS012-0AHWXC) for Bosch Climate 5000 Model C legacy R-410A 12,000 BTU 115V Regular (BMS500-AAS012-0AHWXC / BMS500-AAS012-0CSXRC)

Image: Hydrowest Products

Data completeness: 92%
Last sourced
Jul 26, 2026

SplitAtlas score

8.3 / 10

Methodology
Cooling efficiencyAbove average

(23.5 SEER2) among 12k systems

Heating efficiencyAbove average

(10.0 HSPF2) among 12k systems

Cold-weather performanceBottom quartile

(56.7% heat retained at 5F; -13 F heating floor) among 12k systems

NoiseAbove average

(-40.5 dBA indoor min / 54 dBA outdoor) among 12k systems

WarrantyAbove average

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

Feature setBelow average

(4 verified features) across the catalogue

Documentation & partsBottom quartile

(6 manuals) 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

12,000BTU/h[2]

Rated heating

12,000BTU/h[2]

Buyer review snapshot

Best for / skip if

Skip if

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

Install difficulty

Professional install
  • Electrical: 115V; MCA 19 A; breaker/fuse 25 A.
  • Line set: connection type not sourced; precharged 25 ft; max 98 ft.

Alternatives

Availability and price context

We could not verify a current retail price for this model. We could not find a published consumer price for this model when we last checked on 2026-07-26.

Source date

Model data sourced
Jul 26, 2026
Page reviewed
Jul 26, 2026
Source-backed records
4
Newest source retrieved
Jul 26, 2026

Warranty tiers

Warranty: 10 years parts and compressor as standard.

Review methodology

Strengths

  • 115V wiring makes for a simple hookup, and it is still ENERGY STAR certified.
  • Backed by Bosch's dealer network and warranty support, the same as the current line.

Weaknesses

  • Built on R-410A, a refrigerant under production and import restrictions that will only tighten over time.
  • Not cold-climate rated; heat falls to 6,800 BTU at 5F, the weakest deep-cold output among the 12k options.

Climate suitability

Minimum heating ambient
-13 F[1]
Rated heating at 5F
6,800 BTU/h[2]
Rated heating at 17F
8,400 BTU/h[2]
Rated heating at 47F
12,000 BTU/h[2]

Specifications

Show
Manufacturer
Bosch
Brand
Bosch
Product line
Climate 5000 Model C legacy R-410A
Model number
BMS500-AAS012-0AHWXC indoor / BMS500-AAS012-0CSXRC outdoor
Indoor unit model
BMS500-AAS012-0AHWXC
Outdoor unit model
BMS500-AAS012-0CSXRC
Number of zones
1
Max indoor units
not published
Rated cooling capacity
12,000 BTU/h[2]
Rated heating capacity
12,000 BTU/h[2]
Voltage
115 V[1]
MCA
19 A[1]
Maximum fuse or breaker size
25 A[1]
Breaker needed
not published
SEER2
23.5 SEER2[2]
EER2
13 EER2[2]
HSPF2 (Region 4)
10 HSPF2[2]
HSPF2 (Region 5)
not published
COP
not published
COP at 47F
3.52 COP[1]
COP at 5F
2.16 COP[2]
Minimum outdoor heating temperature
-13 F[1]
Minimum outdoor cooling temperature
-13 F[1]
Maximum outdoor temperature
122 F[1]
Indoor noise range
23.5-40.5 dB(A)[1]
Outdoor noise rating
54 dBA[1]
Indoor weight
25.57 lb[1]
Outdoor weight
66.8 lb[1]
Refrigerant
R-410A[2]
Refrigerant charge
39.5 oz[1]
Manufacturer coverage
not published
Line-set size
1/4 in liquid / 1/2 in suction
Included line-set length
Bosch submittals publish field piping sizes and precharged refrigerant length, but do not specify an included line set for these professional-install systems.
Maximum line-set length
98 ft[1]
Max line set per indoor
not published
Maximum elevation difference
66 ft[1]
Max height between indoor units
not published
Wi-Fi support
not published
Energy Star status
ENERGY STAR certified[3]
AHRI certification number
207759988[2]
Warranty
Standard: 10 yr parts / 10 yr compressor (limited residential warranty terms). 10-year compressor / 10-year parts limited residential warranty; terms and field-installed component limits apply.
Install path
Professional install
Retail price
We could not find a published consumer price for this model when we last checked on 2026-07-26.
Available retailers
not published
Manual links
AHRI public directory record 207759988, ENERGY STAR exact check 207759988, Climate 5000 Ductless Mini-Split Heat Pump (R-410A Version) discontinued page, Bosch Climate 5000 ductless mini-split submittal sheet directory, BMS500-AAS012-0AHWXC & BMS500-AAS012-0CSXRC Bosch Climate 5000 Model C legacy R-410A submittal, HVACDirect exact Bosch offer check bosch-climate-5000-r410a-model-c-12k-regular-115v
Specification sheet
not published
Last sourced date
Jul 26, 2026

Electrical requirements

Show
Voltage
115 V[1]
Voltage range
115V[1]
Phase
1[1]
Frequency
60 Hz[1]
MCA
19 A[1]
Breaker needed
not published
Maximum breaker size
25 A[1]
Maximum fuse size
25 A[1]
Maximum cooling current
not published
Maximum heating current
not published
Manufacturer wire notes
not published

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
25 ft[1]
Included line-set length
Bosch submittals publish field piping sizes and precharged refrigerant length, but do not specify an included line set for these professional-install systems.
Maximum line-set length
98 ft[1]
Max line set per indoor
not published
Max height between indoor units
not published
Indoor dimensions
33.4 x 9.1 x 11.7 in[1]
Outdoor dimensions
30.12 x 11.26 x 21.85 in[1]
Indoor weight
25.57 lb[1]
Outdoor weight
66.8 lb[1]
Drain size
not published

Related systems and guides

Frequently asked questions

Can I install the Bosch Climate 5000 Model C legacy R-410A 12,000 BTU 115V Regular (BMS500-AAS012-0AHWXC / BMS500-AAS012-0CSXRC) myself, or do I need a pro?
Bosch Climate 5000 Model C legacy R-410A 12,000 BTU 115V Regular (BMS500-AAS012-0AHWXC / BMS500-AAS012-0CSXRC) 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 Bosch Climate 5000 Model C legacy R-410A 12,000 BTU 115V Regular (BMS500-AAS012-0AHWXC / BMS500-AAS012-0CSXRC) keep heating in a cold winter?
The manufacturer publishes 6,800 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 Bosch Climate 5000 Model C legacy R-410A 12,000 BTU 115V Regular (BMS500-AAS012-0AHWXC / BMS500-AAS012-0CSXRC) need?
Published electrical requirements: 115 V voltage, 19 A 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 98 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 Bosch Climate 5000 Model C legacy R-410A 12,000 BTU 115V Regular (BMS500-AAS012-0AHWXC / BMS500-AAS012-0CSXRC) carry?
The manufacturer publishes these warranty tiers: Standard: 10 yr parts / 10 yr compressor (limited residential warranty terms). Registration requirements and proof of qualified installation commonly affect coverage, so read the warranty terms before install day.

Data sources

Show
  1. Bosch Thermotechnology Corp.: BMS500-AAS012-0AHWXC & BMS500-AAS012-0CSXRC Bosch Climate 5000 A/B legacy submittalSourced - manufacturer technical document

    Covers Frequency, electrical_spec.indoor_mca_amps, Maximum breaker size, Maximum fuse size, Minimum circuit ampacity, Phase and more

  2. Air-Conditioning, Heating, and Refrigeration Institute: AHRI Appendix M1 public detail for BMS500-AAS012-0CSXRC / BMS500-AAS012-0AHWXCSourced - AHRI directory

    Covers AHRI certification number, performance_spec.cold_climate_designation, Rated cooling capacity, COP at 5F, EER2, Rated heating capacity and more

  3. ENERGY STAR: ENERGY STAR exact row check for AHRI 207759988Sourced - Energy Star listing

    Covers Energy Star status

  4. Bosch Thermotechnology Corp.: Climate 5000 R-454B limited residential warranty statementSourced - 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 26, 2026