SplitAtlas

Della / Optima Series Multi-Zone

Della Optima 18k R-454B 208/230V 2-Zone Mini-Split

Certified capacity
18,000 BTU/h[3]
SEER2
24 SEER2[3]
Heating floor
-13 F[1]
Voltage
230 V[2]
Install path
Professional install

The Della Optima 2-Zone 18k pairs two indoor heads with a single 208/230V outdoor unit in Della's budget-mid line. It posts a nominal SEER2 of 24, EER2 13, HSPF2 10.5, on current low-GWP R-454B refrigerant.

It is not ENERGY STAR certified and not AHRI cold-climate designated. Rated heating holds 20,000 BTU down to 17F, then falls to 16,000 BTU at 5F, so lean on backup heat in a hard winter.

Professional installation required; dealer-quoted.

2 zonesProfessional installCurrent

Refrigerant generation

R-454B - current-generation refrigerant

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Error Codes
Della Optima Series Multi-Zone 2-Zone 18,000 BTU R-454B 208/230V (048-TLP-MODU-1D2) multi-zone mini-split heat pump indoor wall units and outdoor condenser

Image: Della

Data completeness: 89%
Last sourced
Jul 28, 2026

SplitAtlas score

8.5 / 10

Methodology
Cooling efficiencyTop quartile

(24.0 SEER2) among 18k systems

Heating efficiencyAbove average

(10.5 HSPF2) among 18k systems

Cold-weather performanceAbove average

(5F certified capacity: 80% of the 47F rating; -13 F heating floor) among 18k systems

Feature setBelow average

(4 verified features) across the catalogue

Documentation & partsBelow average

(7 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

18,000BTU/hNon-Ducted Indoor Units[3]

Rated heating

20,000BTU/hNon-Ducted Indoor Units[3]

Best-fit use cases

A two-room home in a mild-to-moderate climate chasing low upfront cost, with buyers who need certification or true cold-climate heat better served by the Optima Pro CloudAir or R-32 Vita.

Buyer review snapshot

Best for / skip if

Best for

  • 2-zone projects in the 18k outdoor capacity class.
  • High-efficiency shortlists; SEER2 is 24.

Install difficulty

Professional flared-line install
  • Electrical: 230V; MCA 16 A; breaker/fuse 25 A.
  • Line set: Flared line connections; precharged 25 ft; max 131 ft.
  • 2-zone condenser; indoor-head matching and branch layout are part of the job.

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 28, 2026
Page reviewed
Jul 28, 2026
Source-backed records
4
Newest source retrieved
Jul 28, 2026

Warranty tiers

No Base or Registered tier is established for scoring.

Review methodology

Model context

Install path
This is professional-install equipment; price it with an installed quote.
Structured ratings
Certification: ENERGY STAR certified. Refrigerant: current low-GWP R-454B. Minimum heating ambient: -13 F.

Strengths

  • Two zones from one condenser for a couple of rooms.
  • Nominal SEER2 24 / EER2 13 / HSPF2 10.5, strong for a budget line.
  • Value-priced ductless from an online-focused brand.

Weaknesses

  • Not ENERGY STAR certified and not AHRI cold-climate designated.
  • Heating falls off in deep cold, down to 16,000 BTU at 5F.

Climate suitability

Minimum heating ambient
-13 F[1]
Certified heating at 5F
16,000 BTU/hNon-Ducted Indoor Units[3]
Rated heating at 17F
20,000 BTU/hNon-Ducted Indoor Units[3]
Rated heating at 47F
20,000 BTU/hNon-Ducted Indoor Units[3]

Specifications

Show
Manufacturer
Della
Brand
Della
Product line
Optima Series Multi-Zone
Model number
048-TLP-MODU-1D2
Indoor unit model
Depends on the indoor units you choose
Outdoor unit model
048-TLP-MODU-1D2
Number of zones
2
Max indoor units
2 units[2]
Rated cooling capacity
18,000 BTU/hNon-Ducted Indoor Units[3]
Rated heating capacity
20,000 BTU/hNon-Ducted Indoor Units[3]
Voltage
230 V[2]
MCA
16 A[2]
Maximum fuse or breaker size
25 A[2]
Breaker needed
not published
SEER2
24 SEER2Non-Ducted Indoor Units[3]
EER2
13 EER2Non-Ducted Indoor Units[3]
HSPF2 (Region 4)
10.5 HSPF2Non-Ducted Indoor Units[3]
HSPF2 (Region 5)
Varies by indoor-unit combination
COP
not published
COP at 47F
not published
COP at 5F
2 COPNon-Ducted Indoor Units[3]
Minimum outdoor heating temperature
-13 F[1]
Minimum outdoor cooling temperature
not published
Maximum outdoor temperature
131 F[1]
Indoor noise range
Depends on the indoor units you choose
Outdoor noise rating
58 dBA[2]
Indoor weight
Depends on the indoor units you choose
Outdoor weight
92.6 lb[2]
Refrigerant
R-454B[3]
Refrigerant charge
60.01 oz[2]
Manufacturer coverage
not published
Line-set size
1/4 in per zone liquid / 3/8 in per zone; adapters for larger indoor units when required suction
Included line-set length
Depends on the indoor units you choose
Maximum line-set length
131 ft[2]
Max line set per indoor
85 ft[2]
Maximum elevation difference
49 ft[2]
Max height between indoor units
not published
Wi-Fi support
Depends on the indoor units you choose
Energy Star status
Not ENERGY STAR certified[4]
AHRI certification number
218472764Non-Ducted Indoor Units[3]
Warranty
Della warranty terms vary by registration and installation context; product pages expose Warranty Registration / Warranty Policy links.
Install path
Professional install
Retail price
Installed quote only
Available retailers
not published
Manual links
AHRI public detail 218472764, Della 048-TLP MODU Series Manual, ENERGY STAR exact row 218472764, Della Optima Series Multi-Zone installation manual for 048-TLP-MODU-1D2, Della Optima Series Multi-Zone official product page example for 048-TLP-MODU-1D2, Della Optima Series Multi-Zone manual technical tables for 048-TLP-MODU-1D2
Specification sheet
Della Optima Series Multi-Zone manual technical tables for 048-TLP-MODU-1D2
Last sourced date
Jul 28, 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

    Model numbers
    • 9k: 048-CC-9K2V-IN
    • 12k: 048-CC-12K2V-IN

  • Concealed duct air handlers

    9k, 12k

    Model numbers
    • 9k: 048-DC-9K2V-IN
    • 12k: 048-DC-12K2V-IN

  • Wall-mounted air handlers

    9k, 12k

    Model numbers
    • 9k: 048-TL-9K2VB-20S-IN
    • 9k: 048-TP-9K2V-24S-C-IN
    • 9k: 048-TP-9K2V-24S-IN
    • 12k: 048-TL-12K2VB-23S-IN
    • 12k: 048-TP-12K2V-24S-C-IN
    • 12k: 048-TP-12K2V-24S-IN

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[2]
Voltage range
208/230V[2]
Phase
1[2]
Frequency
60 Hz[2]
MCA
16 A[2]
Breaker needed
not published
Maximum breaker size
25 A[2]
Maximum fuse size
25 A[2]
Maximum cooling current
not published
Maximum heating current
not published
Manufacturer wire notes
12 AWG[2]

Installation considerations

Show
Liquid line
1/4 in per zone[2]
Suction line
3/8 in per zone; adapters for larger indoor units when required[2]
Line connection type
Flared line connections[2]
Precharged length
25 ft[2]
Included line-set length
Depends on the indoor units you choose
Maximum line-set length
131 ft[2]
Max line set per indoor
85 ft[2]
Max height between indoor units
not published
Indoor dimensions
Depends on the indoor units you choose
Outdoor dimensions
36.50 x 14.96 x 27.52 in[2]
Indoor weight
Depends on the indoor units you choose
Outdoor weight
92.6 lb[2]
Drain size
not published

Related systems and guides

Frequently asked questions

Can I install the Della Optima Series Multi-Zone 2-Zone 18,000 BTU R-454B 208/230V (048-TLP-MODU-1D2) myself, or do I need a pro?
Della Optima Series Multi-Zone 2-Zone 18,000 BTU R-454B 208/230V (048-TLP-MODU-1D2) 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 Series Multi-Zone 2-Zone 18,000 BTU R-454B 208/230V (048-TLP-MODU-1D2) keep heating in a cold winter?
The AHRI/ENERGY STAR certification lists 16,000 BTU/h of heating capacity at 5F. Rated heating operation extends down to -13 F. Certified heating efficiency is 10.5 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 Series Multi-Zone 2-Zone 18,000 BTU R-454B 208/230V (048-TLP-MODU-1D2) need?
Published electrical requirements: 230 V voltage, 16 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 from the outdoor unit to one indoor head is 85 ft. The combined piping limit across all heads is 131 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.

Data sources

Show
  1. Della: Della Optima Series Multi-Zone official product-page evidence for 048-TLP-MODU-1D2Sourced - manufacturer product page

    Covers brand.dealer_installation_policy, Minimum outdoor heating temperature, Maximum outdoor temperature, product_line.name, Warranty notes

  2. Della: Della Optima Series Multi-Zone official manual technical table for 048-TLP-MODU-1D5Sourced - manufacturer technical document

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

  3. AHRI certificate #218472764 - search the AHRI DirectorySourced - 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 record for AHRI #218472764 - search ENERGY STARSourced - Energy Star listing

    Covers performance_spec.energy_star_cold_climate, Energy Star status

  5. Della 048-TLP MODU Series ManualSourced - manual

    Covers Manual links

Last updated

Jul 28, 2026