SplitAtlas

Klimaire / Klimaire KIWQ-KOIQ DIY

Klimaire DIY 18k R-454B 230V Mini-Split

Certified capacity
18,000 BTU/h[1]
SEER2
23 SEER2[10]
Heating floor
-13 F[1]
Voltage
230 V[1]
Install path
DIY install

Scaling the DIY line to 18,000 BTU, this 230V head runs SEER2 23, EER2 12.5, and HSPF2 10 on R-454B, with AHRI cold-climate designation. It heats 19,000 BTU at 47F, holds a strong 15,000 BTU at 17F, and keeps 13,600 BTU at 5F. Precharged quick-connect line sets let a capable homeowner install it for a large room without refrigerant tools.

1 zoneDIY installCurrent

Refrigerant generation

R-454B - current-generation refrigerant

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Error Codes
Klimaire KIWQ-KOIQ DIY 18,000 BTU R-454B 208-230V (KIWQ18H2-45T / KOIQ18H2-45T) mini-split heat pump indoor wall unit and outdoor condenser kit

Image: Klimaire

Data completeness: 98%
Last sourced
Aug 17, 2026

SplitAtlas score

8.5 / 10

Methodology
Cooling efficiencyAbove average

(23.0 SEER2) among 18k systems

Heating efficiencyBelow average

(10.0 HSPF2) among 18k systems

Cold-weather performanceBelow average

(71.6% heat retained at 5F; -13 F heating floor) among 18k systems

NoiseTop 10%

(-50 dBA indoor min / 53 dBA outdoor) among 18k systems

WarrantyBelow average

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

Installation accessibilityAbove average

(DIY-marketed; 25 ft precharged; 25 ft included line set) across the catalogue

Feature setTop 10%

(8 verified features) across the catalogue

Documentation & partsBottom quartile

(9 manuals; 51 error-code rows) across the catalogue

Key ratings

Rated cooling

18,000BTU/h[1]

Rated heating

19,000BTU/h[1]

Best-fit use cases

Well suited to a large living area, open floor, or sizable addition in a cold climate where a DIY-inclined owner has a 230V circuit ready.

Where this system ranks

Buyer review snapshot

Best for / skip if

Best for

  • High-efficiency shortlists; SEER2 is 23.

Install difficulty

DIY install path, electrical work likely
  • Electrical: 230V; MCA 12 A; breaker/fuse 20 A.
  • Line set: Quick-connect line connections; precharged 25 ft; included 25 ft; max 65 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 2026-08-17.

Source date

Model data sourced
Aug 17, 2026
Page reviewed
Jul 23, 2026
Source-backed records
12
Newest source retrieved
Aug 17, 2026

Warranty tiers

Warranty: 3 years parts as standard; 5 years parts and 7 years compressor if registered residential use within 45 days.

Review methodology

Strengths

  • Cold-climate heat holding is a highlight: 15,000 BTU at 17F is a shallow drop from 19,000 BTU at 47F, and it stays at 13,600 BTU at 5F.
  • The precharged DIY line set brings 1.5-ton capacity within reach of a skilled homeowner, no pump or EPA handling required.
  • SEER2 23 and HSPF2 10 on low-GWP R-454B deliver premium numbers at value-brand pricing.

Weaknesses

  • Not ENERGY STAR certified, and support depends on a thinner dealer network than Mitsubishi or Daikin.
  • Self-installing a larger head means longer line sets to route carefully and full ownership of commissioning and warranty steps.

Climate suitability

Minimum heating ambient
-13 F[1]
Rated heating at 5F
13,600 BTU/h[9]
Rated heating at 17F
15,000 BTU/h[8]
Rated heating at 47F
19,000 BTU/h[1]

Specifications

Show
Manufacturer
Klimaire
Brand
Klimaire
Product line
Klimaire KIWQ-KOIQ DIY
Model number
KIWQ18H2-45T indoor / KOIQ18H2-45T outdoor
Indoor unit model
KIWQ18H2-45T
Outdoor unit model
KOIQ18H2-45T
Number of zones
1
Max indoor units
not published
Rated cooling capacity
18,000 BTU/h[1]
Rated heating capacity
19,000 BTU/h[1]
Voltage
230 V[1]
MCA
12 A[1]
Maximum fuse or breaker size
20 A[1]
Breaker needed
not published
SEER2
23 SEER2[10]
EER2
12.5 EER2[5]
HSPF2 (Region 4)
10 HSPF2[7]
HSPF2 (Region 5)
not published
COP
not published
COP at 47F
not published
COP at 5F
1.8 COP[4]
Minimum outdoor heating temperature
-13 F[1]
Minimum outdoor cooling temperature
5 F[1]
Maximum outdoor temperature
131 F[1]
Indoor noise range
34-50 dB(A)[1]
Outdoor noise rating
53 dBA[1]
Indoor weight
30.9 lb[1]
Outdoor weight
90.4 lb[1]
Refrigerant
R-454B[1]
Refrigerant charge
not published
Manufacturer coverage
1,000 sq ft[1]
Line-set size
1/4 in liquid / 3/8 in suction
Included line-set length
25 ft[1]
Maximum line-set length
65 ft[1]
Max line set per indoor
not published
Maximum elevation difference
49 ft[1]
Max height between indoor units
not published
Wi-Fi support
supported[1]
Energy Star status
Not ENERGY STAR certified[6]
AHRI certification number
218067070[3]
Warranty
Standard: 3 yr parts (base residential coverage); Best case: 5 yr parts / 7 yr compressor (registered residential use within 45 days). DIY Mini-Split Systems: 5 years parts / 7 years compressor when registered for residential use within 45 days; base coverage is 3 years parts; commercial use is 3 years parts and compressor.
Install path
DIY install
Retail price
We could not find a published consumer price for this model when we last checked on 2026-08-17.
Available retailers
not published
Manual links
AHRI public directory record 218067070, Klimaire KIWQ-KOIQ DIY brochure, ENERGY STAR exact check 218067070, KIWQ/KOIQ 2026 Installation and Users Manual, Klimaire mini-split wall-mount collection, 18,000 BTU KIWQ-KOIQ DIY Series Do-It-Yourself High Wall-Mounted Ductless Mini Split Heat Pump Air Conditioner with E-Z Kuick Connect Kit, Klimaire KIWQ-KOIQ DIY product page quick-connect documentation, HVACDirect exact Klimaire offer check klimaire-kiwq-koiq-diy-18k-218067070-230v, Klimaire warranty information
Specification sheet
not published
Last sourced date
Aug 17, 2026

Electrical requirements

Show
Voltage
230 V[1]
Voltage range
208/230V[1]
Phase
1[1]
Frequency
60 Hz[1]
MCA
12 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
16 AWG, 4-conductor connection wiring[1]

Installation considerations

Show
Liquid line
1/4 in[1]
Suction line
3/8 in[1]
Line connection type
Quick-connect line connections[2]
Precharged length
25 ft[1]
Included line-set length
25 ft[1]
Maximum line-set length
65 ft[1]
Max line set per indoor
not published
Max height between indoor units
not published
Indoor dimensions
43.19 x 13.07 x 8.74 in[1]
Outdoor dimensions
36.5 x 14.96 x 27.52 in[1]
Indoor weight
30.9 lb[1]
Outdoor weight
90.4 lb[1]
Drain size
not published

Related systems and guides

Frequently asked questions

Can I install the Klimaire KIWQ-KOIQ DIY 18,000 BTU R-454B 208-230V (KIWQ18H2-45T / KOIQ18H2-45T) myself, or do I need a pro?
Klimaire KIWQ-KOIQ DIY 18,000 BTU R-454B 208-230V (KIWQ18H2-45T / KOIQ18H2-45T) is sold as a DIY-installable system with a pre-charged 25 ft line set, so no refrigerant handling or vacuum pump is required for a standard install. The electrical circuit is the part that is not DIY: plan on a licensed electrician for the dedicated circuit, and check whether your local permit office requires a permit for the install.
Will the Klimaire KIWQ-KOIQ DIY 18,000 BTU R-454B 208-230V (KIWQ18H2-45T / KOIQ18H2-45T) keep heating in a cold winter?
The manufacturer publishes 13,600 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 Klimaire KIWQ-KOIQ DIY 18,000 BTU R-454B 208-230V (KIWQ18H2-45T / KOIQ18H2-45T) need?
Published electrical requirements: 230 V voltage, 12 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 is 65 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 Klimaire KIWQ-KOIQ DIY 18,000 BTU R-454B 208-230V (KIWQ18H2-45T / KOIQ18H2-45T) carry?
The manufacturer publishes these warranty tiers: Standard: 3 yr parts (base residential coverage); Best case: 5 yr parts / 7 yr compressor (registered residential use within 45 days). 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.: KIWQ09H1-45T & KOIQ09H1-45T technical specificationsSourced - manufacturer technical document

    Covers Frequency, Maximum breaker size, Maximum fuse size, Minimum circuit ampacity, Phase, Manufacturer wire notes and more

  2. Klimaire Products Inc.: KIWQ/KOIQ 2026 Installation and Users ManualSourced - secondary source

    Covers Line connection type

  3. ENERGY STAR record for AHRI #218067070 - search ENERGY STARSourced - Energy Star listing

    Covers AHRI certification number

  4. ENERGY STAR record for AHRI #1 - search ENERGY STARSourced - Energy Star listing

    Covers COP at 5F

  5. ENERGY STAR record for AHRI #12 - search ENERGY STARSourced - Energy Star listing

    Covers EER2

  6. ENERGY STAR record for AHRI #218067070 - search ENERGY STARSourced - Energy Star listing

    Covers Energy Star status

  7. ENERGY STAR record for AHRI #10 - search ENERGY STARSourced - Energy Star listing

    Covers HSPF2 (Region 4)

  8. ENERGY STAR record for AHRI #15000 - search ENERGY STARSourced - Energy Star listing

    Covers Rated heating at 17F

  9. ENERGY STAR record for AHRI #13600 - search ENERGY STARSourced - Energy Star listing

    Covers Rated heating at 5F

  10. ENERGY STAR record for AHRI #23 - search ENERGY STARSourced - Energy Star listing

    Covers SEER2

  11. AHRI certificate #218067070 - search the AHRI DirectorySourced - AHRI directory

    Covers system.lifecycle_status

  12. Klimaire Products Inc.: Klimaire Warranty Information - DIY Mini-Split SystemsSourced - manufacturer product page

    Covers Best-case compressor warranty, Best-case warranty conditions, Best-case parts warranty, Legacy compressor warranty value, Legacy warranty value, Standard warranty conditions and more

Last updated

Jul 23, 2026