SplitAtlas

Della / Optima Pro CloudAir Series

Della Optima Pro CloudAir 18k R-454B 208/230V Mini-Split

Certified capacity
18,000 BTU/h[3]
SEER2
23.5 SEER2[3]
Heating floor
-22 F[1]
Voltage
230 V[1]
Install path
Professional install / DIY-marketed

The Optima Pro CloudAir 18k uses the same certified platform and ratings as the Optima Pro 18k, with CloudAir smart/WiFi controls added. It carries SEER2 23.5, EER2 12.5, HSPF2 10, and 18,000 BTU/h at 47F holding 17,800 BTU/h at 5F. Decide between them on features and price rather than performance.

1 zoneProfessional install / DIY-marketedCurrent

Refrigerant generation

R-454B - current-generation refrigerant

Paid link

$1,850 / Fresh price - checked Jul 24, 2026

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Error Codes
Della Optima Pro CloudAir 18,000 BTU R-454B 208/230V (048-C-TPH-18K2V-C-IN / 048-C-TPH-18K2V-23S-OUT) mini-split heat pump indoor wall unit and outdoor condenser

Image: Della

Data completeness: 93%
Last sourced
Jul 24, 2026

SplitAtlas score

8.2 / 10

Methodology
Cooling efficiencyAbove average

(23.5 SEER2) among 18k systems

Heating efficiencyBelow average

(10.0 HSPF2) among 18k systems

Cold-weather performanceAbove average

(98.9% heat retained at 5F; -22 F heating floor) among 18k systems

NoiseBottom quartile

(34 dBA indoor min / 58 dBA outdoor) among 18k systems

Installation accessibilityBottom quartile

(DIY-marketed; 25 ft precharged; 16.4 ft included line set) across the catalogue

Feature setAbove average

(5 verified features) across the catalogue

Price-to-performanceAbove average

($1,850 median retail) among 18k systems

Documentation & partsBelow average

(3 manuals; spec sheet) across the catalogue

Key ratings

Rated cooling

18,000BTU/h[3]

Rated heating

18,000BTU/h[3]

Buyer review snapshot

Best for / skip if

Best for

  • High-efficiency shortlists; SEER2 is 23.5.

Install difficulty

Professional flared-line install
  • Electrical: 230V; breaker/fuse 30 A.
  • Line set: Flared line connections; precharged 25 ft; included 16.4 ft; max 65 ft.

Alternatives

Availability and price context

  • Verified current price: $1,849.96 at Della; availability in_stock; checked Jul 24, 2026.

Source date

Model data sourced
Jul 24, 2026
Page reviewed
Jul 24, 2026
Source-backed records
4
Newest source retrieved
Jul 24, 2026

Review methodology

Model context

Structured ratings
Certification: ENERGY STAR certified. Refrigerant: current low-GWP R-454B. Minimum heating ambient: -22 F.

Strengths

  • Near-flat heating from 18,000 BTU/h at 47F to 17,800 BTU/h at 5F, now with CloudAir control.
  • SEER2 23.5 with HSPF2 10 and ENERGY STAR certification.

Weaknesses

  • Performance matches the non-CloudAir Optima Pro 18k exactly, so only the connectivity justifies the premium.
  • Della's dealer and service footprint is smaller than that of established premium brands.

Climate suitability

Minimum heating ambient
-22 F[1]
Rated heating at 5F
17,800 BTU/h[3]
Rated heating at 17F
15,500 BTU/h[3]
Rated heating at 47F
18,000 BTU/h[3]

Specifications

Show
Manufacturer
Della
Brand
Della
Product line
Optima Pro CloudAir Series
Model number
048-C-TPH-18K2V-C-IN indoor / 048-C-TPH-18K2V-23S-OUT outdoor
Indoor unit model
048-C-TPH-18K2V-C-IN
Outdoor unit model
048-C-TPH-18K2V-23S-OUT
Number of zones
1
Max indoor units
not published
Rated cooling capacity
18,000 BTU/h[3]
Rated heating capacity
18,000 BTU/h[3]
Voltage
230 V[1]
MCA
not published - manufacturer specifies 30 A breaker
Maximum fuse or breaker size
30 A[1]
Breaker needed
30 A[1]
SEER2
23.5 SEER2[3]
EER2
12.5 EER2[3]
HSPF2 (Region 4)
10 HSPF2[3]
HSPF2 (Region 5)
not published
COP
not published
COP at 47F
not published
COP at 5F
1.8 COP[3]
Minimum outdoor heating temperature
-22 F[1]
Minimum outdoor cooling temperature
not published
Maximum outdoor temperature
131 F[1]
Indoor noise range
34 - 48 dBA[2]
Outdoor noise rating
58 dBA[2]
Indoor weight
30.9 lb[1]
Outdoor weight
93.7 lb[1]
Refrigerant
R-454B[3]
Refrigerant charge
not published
Manufacturer coverage
not published
Line-set size
1/4 in liquid / 1/2 in suction
Included line-set length
16.4 ft[1]
Maximum line-set length
65 ft[2]
Max line set per indoor
not published
Maximum elevation difference
49 ft[2]
Max height between indoor units
not published
Wi-Fi support
supported[1]
Energy Star status
ENERGY STAR certified[4]
AHRI certification number
218640164[3]
Warranty
not published
Install path
Professional install / DIY-marketed
Marketing install label
DIY-marketed
Retail price
$1,849.96
Available retailers
Della
Manual links
AHRI Appendix M1 public detail record 218640164, Optima Pro CloudAir Series installation and operation guide, Optima Pro CloudAir 18,000 BTU Della product-page specifications
Specification sheet
Optima Pro CloudAir 18,000 BTU Della product-page specifications
Last sourced date
Jul 24, 2026

Retail purchase context

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 Della

$1,850 / Fresh price - checked Jul 24, 2026

Electrical requirements

Show
Voltage
230 V[1]
Voltage range
208/230V[1]
Phase
1[1]
Frequency
not published
MCA
not published - manufacturer specifies 30 A breaker
Breaker needed
30 A[1]
Maximum breaker size
not published
Maximum fuse size
30 A[1]
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
Flared line connections[2]
Precharged length
25 ft[2]
Included line-set length
16.4 ft[1]
Maximum line-set length
65 ft[2]
Max line set per indoor
not published
Max height between indoor units
not published
Indoor dimensions
43.18 in W x 8.74 in H x 13.07 in D[1]
Outdoor dimensions
36.5 in W x 27.52 in H x 14.96 in D[1]
Indoor weight
30.9 lb[1]
Outdoor weight
93.7 lb[1]
Drain size
not published

Related systems and guides

Frequently asked questions

Can I install the Della Optima Pro CloudAir 18,000 BTU R-454B 208/230V (048-C-TPH-18K2V-C-IN / 048-C-TPH-18K2V-23S-OUT) myself, or do I need a pro?
Della Optima Pro CloudAir 18,000 BTU R-454B 208/230V (048-C-TPH-18K2V-C-IN / 048-C-TPH-18K2V-23S-OUT) 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 Della Optima Pro CloudAir 18,000 BTU R-454B 208/230V (048-C-TPH-18K2V-C-IN / 048-C-TPH-18K2V-23S-OUT) keep heating in a cold winter?
The manufacturer publishes 17,800 BTU/h of heating output 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 Della Optima Pro CloudAir 18,000 BTU R-454B 208/230V (048-C-TPH-18K2V-C-IN / 048-C-TPH-18K2V-23S-OUT) need?
Published electrical requirements: 230 V voltage, not published - manufacturer specifies 30 A breaker minimum circuit ampacity, and 30 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.

Data sources

Show
  1. Della: DELLA Optima Pro CloudAir Series 18000 BTU 23.5 SEER2 Ultra Hyper Heat Mini Split AC - Up to 1000 Sq.Ft. official product pageSourced - manufacturer product page

    Covers Breaker needed, Maximum fuse size, Phase, Voltage, Voltage range, Included line-set length and more

  2. Della: Optima Pro CloudAir Series installation and operation guideSourced - manufacturer technical document

    Covers Indoor noise range, Line connection type, Maximum elevation difference, Maximum line-set length, Outdoor noise rating, Precharged length

  3. AHRI certificate #218640164 - search the AHRI DirectorySourced - AHRI directory

    Covers AHRI certification number, Rated cooling capacity, COP at 5F, EER2, Rated heating capacity, HSPF2 (Region 4) and more

  4. ENERGY STAR: ENERGY STAR exact row check for AHRI 215864147Sourced - Energy Star listing

    Covers Energy Star status

Last updated

Jul 24, 2026