SplitAtlas

Klimaire / KMHR Hyper Heat Series

Klimaire KMHR Hyper Heat 18k HZ R-454B 208/230V 3-Zone Mini-Split

Certified capacity
19,000 BTU/h[2]
SEER2
21 SEER2[2]
Heating floor
-22 F[1]
Voltage
230 V[1]
Install path
Professional install

The Klimaire KMHR Hyper Heat Series 3-Zone 18k runs three heads off one 208/230V outdoor unit at a certified nominal SEER2 21, EER2 13, HSPF2 10 on current R-454B refrigerant. From the Hyper Heat line, its rated heating holds strong in the cold: full 20,000 BTU at both 47F and 17F, then 18,000 BTU at 5F.

That is genuine low-temperature heating that holds output well into the cold, though the system is not ENERGY STAR certified. It is a value-focused pick that sits below the top premium brands on brand and dealer support.

Professional installation required; dealer-quoted.

3 zonesProfessional installCurrent

Refrigerant generation

R-454B - current-generation refrigerant

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Error Codes
Klimaire KMHR Hyper Heat Series 3-Zone 18,000 BTU R-454B 208/230V (KMHR319-H221-4) mini-split heat pump outdoor condenser

Image: Klimaire

Data completeness: 95%
Last sourced
Jul 29, 2026

SplitAtlas score

8.1 / 10

Methodology
Cooling efficiencyBelow average

(21.0 SEER2) among 18k systems

Heating efficiencyBelow average

(10.0 HSPF2) among 18k systems

Cold-weather performanceAbove average

(5F certified capacity: 90% of the 47F rating; -22 F heating floor) among 18k systems

WarrantyBelow average

(5 yr parts / 7 yr compressor) across the catalogue

Feature setBelow average

(4 verified features) across the catalogue

Documentation & partsBelow average

(6 manuals; spec sheet) 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.

    Get a quote

Key ratings

Rated cooling

19,000BTU/hNon-Ducted Indoor Units[2]

Rated heating

20,000BTU/hNon-Ducted Indoor Units[2]

Buyer review snapshot

Best for / skip if

Best for

  • 3-zone projects in the 18k outdoor capacity class.

Install difficulty

Professional flared-line install
  • Electrical: 230V; MCA 17.5 A; breaker/fuse 20 A.
  • Line set: Flared line connections; max 196.8 ft.
  • 3-zone condenser; indoor-head matching and branch layout are part of the job.

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 29, 2026
Page reviewed
Jul 29, 2026
Source-backed records
4
Newest source retrieved
Jul 29, 2026

Warranty tiers

Registered
5 yr parts / 7 yr compressor - registration/installation terms

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

Review methodology

Model context

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: current low-GWP R-454B. Minimum heating ambient: -22 F.

Strengths

  • Certified nominal SEER2 21 / EER2 13 / HSPF2 10 on current R-454B refrigerant.
  • Rated heating holds the full 20,000 BTU from 47F down to 17F, with 18,000 BTU at 5F.
  • Three zones from one condenser cover a small floor.
  • Value price below the premium brands on current low-GWP refrigerant.

Weaknesses

  • Not ENERGY STAR certified and below the top premium brands on brand/dealer support.
  • 19,000 BTU of cooling across three zones is modest per room; size each head.

Climate suitability

Minimum heating ambient
-22 F[1]
Certified heating at 5F
18,000 BTU/hNon-Ducted Indoor Units[2]
Rated heating at 17F
20,000 BTU/hNon-Ducted Indoor Units[2]
Rated heating at 47F
20,000 BTU/hNon-Ducted Indoor Units[2]

Specifications

Show
Manufacturer
Klimaire
Brand
Klimaire
Product line
KMHR Hyper Heat Series
Model number
KMHR319-H221-4
Indoor unit model
Depends on the indoor units you choose
Outdoor unit model
KMHR319-H221-4
Number of zones
3
Max indoor units
3 units[1]
Rated cooling capacity
19,000 BTU/hNon-Ducted Indoor Units[2]
Rated heating capacity
20,000 BTU/hNon-Ducted Indoor Units[2]
Voltage
230 V[1]
MCA
17.5 A[1]
Maximum fuse or breaker size
20 A[1]
Breaker needed
not published
SEER2
21 SEER2Non-Ducted Indoor Units[2]
EER2
13 EER2Non-Ducted Indoor Units[2]
HSPF2 (Region 4)
10 HSPF2Non-Ducted Indoor Units[2]
HSPF2 (Region 5)
Varies by indoor-unit combination
COP
not published
COP at 47F
not published
COP at 5F
not published
Minimum outdoor heating temperature
-22 F[1]
Minimum outdoor cooling temperature
-22 F[1]
Maximum outdoor temperature
122 F[1]
Indoor noise range
Depends on the indoor units you choose
Outdoor noise rating
62 dBA[1]
Indoor weight
Depends on the indoor units you choose
Outdoor weight
137.35 lb[1]
Refrigerant
R-454B[2]
Refrigerant charge
78.31 oz[1]
Manufacturer coverage
not published
Line-set size
3 x 1/4 in liquid / 3 x 3/8 in suction
Included line-set length
Depends on the indoor units you choose
Maximum line-set length
196.8 ft[1]
Max line set per indoor
98.4 ft[1]
Maximum elevation difference
49.2 ft[1]
Max height between indoor units
not published
Wi-Fi support
Depends on the indoor units you choose
Energy Star status
Not ENERGY STAR certified[3]
AHRI certification number
217489283Non-Ducted Indoor Units[2]
Warranty
Registered: 5 yr parts / 7 yr compressor (registration/installation terms). Score uses Registered.. 7-year compressor, 5-year parts warranty with Klimaire registration/installation terms.
Install path
Professional install
Retail price
Installed quote only
Available retailers
not published
Manual links
AHRI public detail 217489283, Klimaire KMIR/KMHR Multi-Zone Combination Rule and official indoor-unit pages, ENERGY STAR exact lookup 217489283, Klimaire KMHR Hyper Heat Series official product page for KMHR319-H221-4, Klimaire KMHR Hyper Heat Series official product-page specification table
Specification sheet
Klimaire KMHR Hyper Heat Series official product-page specification table
Last sourced date
Jul 29, 2026

Compatible indoor units

This is an outdoor unit. You choose its indoor heads separately - up to the maximum this condenser supports - and you can mix room sizes and styles across the zones. The models below are the heads this unit is documented to pair with.

  • Ceiling cassette air handlers

    9k, 12k, 18k, 24k

    Model numbers
    • 9k: KTIS09-HS2-4
    • 12k: KTIS012-H2-4
    • 18k: KTIS18-H2-4
    • 24k: KTIS024-H2-4

  • Ducted recessed air handlers

    18k

    Model numbers
    • 18k: KDIP18-H2

  • Floor/ceiling air handlers

    18k, 24k

    Model numbers
    • 18k: KUIR18-H2-4
    • 24k: KUIR24-H2-4

  • Wall-mounted air handlers

    6k, 9k, 12k, 18k, 24k

    Model numbers
    • 6k: KSIH006-H225-IW-4
    • 9k: KSIH009-H225-IW-4
    • 12k: KSIH012-H222-IW-4
    • 18k: KSIH018-H220-IW-4
    • 24k: KSIH024-H220-IW-4

Sizing note: do not just add up the rooms. Multi-zone condensers have a maximum total connected capacity, and connecting more head capacity than the unit is rated for is a common installer mistake that hurts efficiency and comfort. Match total head capacity to the condenser's rating.

Electrical requirements

Show
Voltage
230 V[1]
Voltage range
208/230V[1]
Phase
1[1]
Frequency
60 Hz[1]
MCA
17.5 A[1]
Breaker needed
not published
Maximum breaker size
20 A[1]
Maximum fuse size
20 A[1]
Maximum cooling current
not published
Maximum heating current
not published
Manufacturer wire notes
not published

Installation considerations

Show
Liquid line
3 x 1/4 in[1]
Suction line
3 x 3/8 in[1]
Line connection type
Flared line connections[1]
Precharged length
not published
Included line-set length
Depends on the indoor units you choose
Maximum line-set length
196.8 ft[1]
Max line set per indoor
98.4 ft[1]
Max height between indoor units
not published
Indoor dimensions
Depends on the indoor units you choose
Outdoor dimensions
37.24 x 16.14 x 31.89 in[1]
Indoor weight
Depends on the indoor units you choose
Outdoor weight
137.35 lb[1]
Drain size
not published

Related systems and guides

Frequently asked questions

Can I install the Klimaire KMHR Hyper Heat Series 3-Zone 18,000 BTU R-454B 208/230V (KMHR319-H221-4) myself, or do I need a pro?
Klimaire KMHR Hyper Heat Series 3-Zone 18,000 BTU R-454B 208/230V (KMHR319-H221-4) 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 Klimaire KMHR Hyper Heat Series 3-Zone 18,000 BTU R-454B 208/230V (KMHR319-H221-4) keep heating in a cold winter?
The AHRI/ENERGY STAR certification lists 18,000 BTU/h of heating capacity 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 Klimaire KMHR Hyper Heat Series 3-Zone 18,000 BTU R-454B 208/230V (KMHR319-H221-4) need?
Published electrical requirements: 230 V voltage, 17.5 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 from the outdoor unit to one indoor head is 98.4 ft. The combined piping limit across all heads is 196.8 ft. Measure the planned routing before ordering.
What warranty does the Klimaire KMHR Hyper Heat Series 3-Zone 18,000 BTU R-454B 208/230V (KMHR319-H221-4) carry?
The manufacturer publishes these warranty tiers: Registered: 5 yr parts / 7 yr compressor (registration/installation terms). Score uses Registered.. Registration requirements and proof of qualified installation commonly affect coverage, so read the warranty terms before install day.

Data sources

Show
  1. Klimaire Products Inc.: Klimaire KMHR Hyper Heat Series official product-page evidence for KMHR536-H224-4Sourced - manufacturer product page

    Covers Frequency, Maximum breaker size, Maximum fuse size, Minimum circuit ampacity, Phase, Voltage and more

  2. AHRI certificate #217489283 - search the AHRI DirectorySourced - AHRI directory

    Covers AHRI certification number, performance_spec.cold_climate_designation, Rated cooling capacity, EER2, Rated heating capacity, HSPF2 (Region 4) and more

  3. ENERGY STAR: ENERGY STAR exact row check for AHRI 215735288Sourced - Energy Star listing

    Covers performance_spec.energy_star_cold_climate, Energy Star status

  4. Klimaire Products Inc.: Klimaire KMIR Series official product-page evidence for KMIR536-H224-4Sourced - manufacturer product page

    Covers Registered compressor warranty, Registered warranty conditions, Registered parts warranty

  5. Klimaire KMIR/KMHR Multi-Zone Combination Rule and official indoor-unit pagesSourced - manual

    Covers Manual links

Last updated

Jul 29, 2026