SplitAtlas

Daikin / OTERRA R-32

Daikin OTERRA 18k R-32 208/230V Mini-Split

Certified capacity
18,000 BTU/h[3]
SEER2
21 SEER2[3]
Heating floor
5 F[2]
Voltage
208/230V[1]
Install path
Professional install

The Daikin Oterra 18k is the 1.5-ton standard unit: SEER2 21, EER2 12, HSPF2 9.6 on R-32, with 21,600 BTU of heat at 47F and 15,200 BTU at 5F. It brings solid efficiency and Daikin support to a large room in a moderate climate.

1 zoneProfessional installCurrent

Refrigerant generation

R-32 - current-generation refrigerant

This system's warranty depends on licensed installation — get quotes from installers in your area.

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Error Codes
Daikin OTERRA 18,000 BTU R-32 208/230V (FTXF18BVJU9 / RXF18BVJU9)

Image: Daikin

Data completeness: 100%
Last sourced
Aug 8, 2026

SplitAtlas score

7.9 / 10

Methodology
Cooling efficiencyBelow average

(21.0 SEER2) among 18k systems

Heating efficiencyBelow average

(9.6 HSPF2) among 18k systems

Cold-weather performanceBottom quartile

(5F certified capacity: 70.4% of the 47F rating; 5 F heating floor) among 18k systems

NoiseBottom quartile

(33 dBA indoor min / 54 dBA outdoor) among 18k systems

WarrantyTop 10%

(12 yr parts, no separate compressor term) across the catalogue

Feature setBelow average

(4 verified features) across the catalogue

Documentation & partsTop quartile

(9 manuals; spec sheet; parts channel) 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

18,000BTU/h[3]

Rated heating

21,600BTU/h[3]

Buyer review snapshot

Install difficulty

Professional install
  • Electrical: 208/230V; MCA 21.4 A; breaker/fuse 25 A.
  • Line set: connection type not sourced; precharged 49.25 ft; max 98.5 ft.

Alternatives

Availability and price context

  • Sold at Amazon. Open the listing for today's price and stock.

Purchase channel policy

Daikin's warranty policy allows the internet-purchase path when the equipment is installed by a dealer following applicable code, policy, and licensing requirements.

Warranty impact
Warranty coverage is lost for consumer internet purchases only when the dealer-installation exception is not satisfied.
Installation condition
The unit must be installed by a dealer adhering to all applicable federal, state, and local codes, policies, and licensing requirements.
Authorized channel
Daikin dealer or contractor channel with compliant installation; Daikin directs owners to local dealers for quotes, service, and parts.

Buying online can keep warranty coverage when a compliant Daikin dealer installs the system; confirm that installation path before purchase.

Compare online-purchase warranty rules by brand

Source: Daikin Comfort Technologies North America, Inc.: Standard Warranty - Internet Sales Policy for Warranty; retrieved Aug 13, 2026.

Source date

Model data sourced
Aug 8, 2026
Page reviewed
Jul 23, 2026
Source-backed records
7
Newest source retrieved
Aug 8, 2026

Warranty tiers

Registered
12 yr parts / no separate compressor term - timely registered residential all-parts coverage

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

Review methodology

Model context

Structured ratings
Certification: ENERGY STAR certified and AHRI cold-climate designated. Refrigerant: current low-GWP R-32. Minimum heating ambient: 5 F.

Strengths

  • SEER2 21 with 21,600 BTU rated heat at 47F; ENERGY STAR certified.
  • Current R-32 refrigerant; Daikin reliability reputation.

Weaknesses

  • 5F output tapers to 15,200 BTU - the Aurora 18k holds a full 21,600 BTU in deep cold.
  • HSPF2 9.6; professional installation required.

Climate suitability

Minimum heating ambient
5 F[2]
Certified heating at 5F
15,200 BTU/h[3]
Rated heating at 17F
15,200 BTU/h[3]
Rated heating at 47F
21,600 BTU/h[3]

Specifications

Show
Manufacturer
Daikin
Brand
Daikin
Product line
OTERRA R-32
Model number
FTXF18BVJU9 indoor / RXF18BVJU9 outdoor
Indoor unit model
FTXF18BVJU9
Outdoor unit model
RXF18BVJU9
Number of zones
1
Max indoor units
not published
Rated cooling capacity
18,000 BTU/h[3]
Rated heating capacity
21,600 BTU/h[3]
Voltage
208/230V[1]
MCA
21.4 A[1]
Maximum fuse or breaker size
25 A[1]
Breaker needed
not published
SEER2
21 SEER2[3]
EER2
12 EER2[3]
HSPF2 (Region 4)
9.6 HSPF2[3]
HSPF2 (Region 5)
not published
COP
not published
COP at 47F
not published
COP at 5F
2 COP[3]
Minimum outdoor heating temperature
5 F[2]
Minimum outdoor cooling temperature
50 F[2]
Maximum outdoor temperature
122 F[2]
Indoor noise range
minimum 33 dB(A)[2]
Outdoor noise rating
54 dBA[2]
Indoor weight
28 lb[2]
Outdoor weight
113 lb[2]
Refrigerant
R-32[3]
Refrigerant charge
not published
Manufacturer coverage
not published
Line-set size
1/4 in liquid / 1/2 in suction
Included line-set length
Daikin professional single-zone systems publish field-supplied line sizes and maximum/precharged piping data; no included consumer line set length is published.
Maximum line-set length
98.5 ft[1]
Max line set per indoor
not published
Maximum elevation difference
65.625 ft[1]
Max height between indoor units
not published
Wi-Fi support
Wi-Fi support depends on the selected indoor controller, accessory, or bundle; Daikin does not specify it as a uniform built-in feature for this system.
Energy Star status
ENERGY STAR certified[4]
AHRI certification number
217005314[3]
Warranty
Registered: 12 yr parts / no separate compressor term (timely registered residential all-parts coverage). Score uses Registered.. Registered residential Daikin ductless coverage is up to 12 years all parts when registered on time; commercial coverage is shorter. No separate longer compressor-only term was found in the PWD DMST WZS warranty statement.
Install path
Professional install
Retail price
not published
Available retailers
Amazon
Manual links
AHRI certificate 217005314, AHRI public detail 217005314, ENERGY STAR exact row lookup for AHRI 217005314, Daikin OTERRA R-32 installation manual, Daikin OTERRA product page, Daikin OTERRA R-32 product brochure, Daikin OTERRA R-32 BVJU engineering manual EDUS042405, Daikin PWD DMST WZS limited warranty statement
Specification sheet
Daikin OTERRA R-32 BVJU engineering manual EDUS042405
Last sourced date
Aug 8, 2026

Retail purchase context

Dealer-installation warranty note

Buying online can keep warranty coverage when a compliant Daikin dealer installs the system; confirm that installation path before purchase.

Installation condition: The unit must be installed by a dealer adhering to all applicable federal, state, and local codes, policies, and licensing requirements.

Dealer path: Daikin dealer or contractor channel with compliant installation; Daikin directs owners to local dealers for quotes, service, and parts.

Some retailer links may earn us a commission at no extra cost; paid relationships never change scores or recommendations. Affiliate disclosure

Paid link

Dealer-installation warranty note

Buying online can keep warranty coverage when a compliant Daikin dealer installs the system; confirm that installation path before purchase.

Check price on Amazon

Parts and filters

Fits Daikin OTERRA 18,000 BTU R-32 208/230V (FTXF18BVJU9 / RXF18BVJU9). Part numbers and fit notes identify compatibility only; no manufacturer endorsement is implied.

filter-deodorizing

Daikin titanium apatite deodorizing filter without frame

Fits
Daikin OTERRA 18,000 BTU R-32 208/230V (FTXF18BVJU9 / RXF18BVJU9)
OEM part number
KAF970A46
Filter care
Replace every 3 years; vacuum every 6 months in between; if heavily soiled, soak in lukewarm water for 10 to 15 minutes and shade-dry.
Fit note
Fits FTXF18BVJU9 / RXF18BVJU9. Daikin publishes this OEM filter part number. HVACDirect's exact-part page was out of stock when checked; Amazon lists the part from My Filter Company.
Source
Daikin OTERRA R-32 Engineering Data, 13. Options - 13.1 Option List, page p. 169 (Titanium apatite deodorizing filter (without frame) KAF970A46)

Some retailer links may earn us a commission at no extra cost; paid relationships never change scores or recommendations. Affiliate disclosure

Paid link

Check price on Amazon

wired-controller

Daikin wired remote controller

Fits
Daikin OTERRA 18,000 BTU R-32 208/230V (FTXF18BVJU9 / RXF18BVJU9)
OEM part number
BRC944B2
Fit note
Fits FTXF18BVJU9 / RXF18BVJU9. Manufacturer documentation publishes this OEM part number for this model family. HVACDirect was verified as a live exact-part page on 2026-08-01.
Source
Daikin OTERRA R-32 Engineering Data, 13. Options - 13.1 Option List, page p. 169 (Wired remote controller BRC944B2)

Some retailer links may earn us a commission at no extra cost; paid relationships never change scores or recommendations. Affiliate disclosure

Paid link

Check price at HVACDirect

remote-control-cord

Daikin wired remote controller cord, 9.8 ft

Fits
Daikin OTERRA 18,000 BTU R-32 208/230V (FTXF18BVJU9 / RXF18BVJU9)
OEM part number
BRCW901A03
Fit note
Fits FTXF18BVJU9 / RXF18BVJU9. Manufacturer documentation publishes this OEM part number for this model family. No live HVACDirect exact-part offer was found; source through an authorized Daikin dealer with the model and serial number.
Source
Daikin OTERRA R-32 Engineering Data, 13. Options - 13.1 Option List, page p. 169 (Length 9.8 ft (3 m) BRCW901A03)

control-interface

Daikin wiring adaptor for timer clock or remote controller

Fits
Daikin OTERRA 18,000 BTU R-32 208/230V (FTXF18BVJU9 / RXF18BVJU9)
OEM part number
KRP413BB1S
Fit note
Fits FTXF18BVJU9 / RXF18BVJU9. Manufacturer documentation publishes this OEM part number for this model family. No live HVACDirect exact-part offer was found; source through an authorized Daikin dealer with the model and serial number.
Source
Daikin OTERRA R-32 Engineering Data, 13. Options - 13.1 Option List, page p. 169 (KRP413BB1S)

drain-plug

Daikin outdoor unit drain plug

Fits
Daikin OTERRA 18,000 BTU R-32 208/230V (FTXF18BVJU9 / RXF18BVJU9)
OEM part number
KKP937A4
Fit note
Fits FTXF18BVJU9 / RXF18BVJU9. Manufacturer documentation publishes this OEM part number for this model family. No live HVACDirect exact-part offer was found; source through an authorized Daikin dealer with the model and serial number.
Source
Daikin OTERRA R-32 Engineering Data, 13. Options - 13.1 Option List, page p. 169 (Drain plug KKP937A4)

drain-pan-heater

Daikin outdoor unit drain pan heater

Fits
Daikin OTERRA 18,000 BTU R-32 208/230V (FTXF18BVJU9 / RXF18BVJU9)
OEM part number
KEH064A41
Fit note
Fits FTXF18BVJU9 / RXF18BVJU9. Manufacturer options list publishes this accessory for the matching class. No live HVACDirect exact-part offer was found; source through an authorized Daikin dealer with the model and serial number.
Source
Daikin OTERRA R-32 Engineering Data, 13. Options - 13.1 Option List, page p. 169 (Drain pan heater KEH068A41 KEH064A41)
Find this model's filterReplacement Parts & Filters

Electrical requirements

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

Installation considerations

Show
Liquid line
1/4 in[1]
Suction line
1/2 in[1]
Line connection type
not published
Precharged length
49.25 ft[1]
Included line-set length
Daikin professional single-zone systems publish field-supplied line sizes and maximum/precharged piping data; no included consumer line set length is published.
Maximum line-set length
98.5 ft[1]
Max line set per indoor
not published
Max height between indoor units
not published
Indoor dimensions
11-5/8 x 39-3/8 x 10-3/4 in[2]
Outdoor dimensions
29-1/2 x 34-1/4 x 12-5/8 in[2]
Indoor weight
28 lb[2]
Outdoor weight
113 lb[2]
Drain size
not published

Related systems and guides

Frequently asked questions

Can I install the Daikin OTERRA 18,000 BTU R-32 208/230V (FTXF18BVJU9 / RXF18BVJU9) myself, or do I need a pro?
Daikin OTERRA 18,000 BTU R-32 208/230V (FTXF18BVJU9 / RXF18BVJU9) 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 Daikin OTERRA 18,000 BTU R-32 208/230V (FTXF18BVJU9 / RXF18BVJU9) keep heating in a cold winter?
The AHRI/ENERGY STAR certification lists 15,200 BTU/h of heating capacity at 5F. Rated heating operation extends down to 5 F. Certified heating efficiency is 9.6 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 Daikin OTERRA 18,000 BTU R-32 208/230V (FTXF18BVJU9 / RXF18BVJU9) need?
Published electrical requirements: 208/230V voltage, 21.4 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 98.5 ft. The outdoor unit's factory charge covers up to 49.25 ft of line; longer runs need added refrigerant. Measure the planned routing before ordering.
What warranty does the Daikin OTERRA 18,000 BTU R-32 208/230V (FTXF18BVJU9 / RXF18BVJU9) carry?
The manufacturer publishes these warranty tiers: Registered: 12 yr parts / no separate compressor term (timely registered residential all-parts coverage). 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. Daikin Comfort Technologies North America, Inc.: FTXF09BVJU9 & RXF09BVJU9 Daikin OTERRA engineering dataSourced - manufacturer technical document

    Covers Frequency, electrical_spec.guaranteed_voltage_range, Maximum breaker size, Minimum circuit ampacity, Phase, Voltage range and more

  2. Daikin Comfort Technologies North America, Inc.: Daikin OTERRA R-32 product brochureSourced - manufacturer technical document

    Covers Indoor dimensions, Indoor noise range, Indoor weight, Outdoor dimensions, Outdoor noise rating, Outdoor weight and more

  3. Air-Conditioning, Heating, and Refrigeration Institute: AHRI public detail 217005314 for FTXF18BVJU9 / RXF18BVJU9Sourced - AHRI directory

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

  4. ENERGY STAR: ENERGY STAR exact row for RXF18BVJU9 / FTXF18BVJU9Sourced - Energy Star listing

    Covers Energy Star status

  5. Amazon: Daikin 18,000 BTU 21 SEER2 Oterra Ductless Mini Split Air Conditioner & Heat Pump | R-32 Refrigerant | Single Zone Wall Mounted System | RXF18BVJU9 - FTXF18BVJU9 (B0GYQGPTMR)Sourced - retailer listing

    Covers Retail price

  6. Daikin Comfort Technologies North America, Inc.: Daikin OTERRA product pageSourced - manufacturer product page

    Covers system.lifecycle_status

  7. Daikin Comfort Technologies North America, Inc.: Daikin PWD DMST WZS limited warranty statementSourced - manufacturer technical document

    Covers Legacy compressor warranty value, Legacy warranty value, Registered compressor warranty status, Registered warranty conditions, Registered parts warranty, Warranty notes

Last updated

Jul 23, 2026