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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

8.2 / 10

Methodology
Cooling efficiencyAbove average

(23.5 SEER2) among 12k systems

Heating efficiencyAbove average

(10.0 HSPF2) among 12k systems

Cold-weather performanceBottom quartile

(5F certified capacity: 56.7% of the 47F rating; -13 F heating floor) among 12k systems

NoiseBelow average

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

WarrantyTop quartile

(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

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

Warranty tiers

Base
10 yr parts / 10 yr compressor - limited residential warranty terms

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

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]
Certified 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

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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
Base: 10 yr parts / 10 yr compressor (limited residential warranty terms). Score uses Base.. 10-year compressor / 10-year parts limited residential warranty; terms and field-installed component limits apply.
Install path
Professional install
Retail price
Installed quote only
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
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 AHRI/ENERGY STAR certification lists 6,800 BTU/h of heating capacity 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. The outdoor unit's factory charge covers up to 25 ft of line; longer runs need added refrigerant. 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: Base: 10 yr parts / 10 yr compressor (limited residential warranty terms). Score uses Base.. 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, Base compressor warranty, Base warranty conditions, Base parts warranty, Warranty notes

Last updated

Jul 26, 2026