SplitAtlas

Della / Optima Series Multi-Zone

Della Optima 35k R-454B 208/230V 4-Zone Mini-Split

Certified capacity
35,000 BTU/h[3]
SEER2
22.5 SEER2[3]
Heating floor
-13 F[1]
Voltage
230 V[2]
Install path
Professional install

The Della Optima 4-Zone 35k drives four indoor heads from one 208/230V outdoor unit in Della's budget-mid line. It posts a nominal SEER2 of 22.5, EER2 11.1, HSPF2 10, on current low-GWP R-454B refrigerant.

It is not ENERGY STAR certified and not AHRI cold-climate designated. Rated heating falls from 36,000 BTU at 47F to 27,400 at 17F and 26,000 at 5F.

Professional installation required; dealer-quoted.

4 zonesProfessional installCurrent

Refrigerant generation

R-454B - current-generation refrigerant

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Error Codes
Della Optima Series Multi-Zone 4-Zone 35,000 BTU R-454B 208/230V (048-TLP-MODU-1D4) multi-zone mini-split heat pump indoor wall units and outdoor condenser

Image: Della

Data completeness: 89%
Last sourced
Jul 28, 2026

SplitAtlas score

8.4 / 10

Methodology
Cooling efficiencyAbove average

(22.5 SEER2) among 36k systems

Heating efficiencyAbove average

(10.0 HSPF2) among 36k systems

Cold-weather performanceBelow average

(72.2% heat retained at 5F; -13 F heating floor) among 36k 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

35,000BTU/hNon-Ducted Indoor Units[3]

Rated heating

36,000BTU/hNon-Ducted Indoor Units[3]

Buyer review snapshot

Best for / skip if

Best for

  • 4-zone projects in the 36k outdoor capacity class.
  • High-efficiency shortlists; SEER2 is 22.5.

Install difficulty

Professional flared-line install
  • Electrical: 230V; MCA 22 A; breaker/fuse 35 A.
  • Line set: Flared line connections; precharged 25 ft; max 263 ft.
  • 4-zone condenser; indoor-head matching and branch layout are part of the job.

Alternatives

Availability and price context

We could not verify a current retail price for this model. We could not find this exact model in stock at a retailer we work with when we last checked on 2026-07-28.

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

Warranty: Della warranty terms vary by registration and installation context; product pages expose Warranty Registration / Warranty Policy links.

Review methodology

Model context

Structured ratings
Certification: ENERGY STAR certified. Refrigerant: current low-GWP R-454B. Minimum heating ambient: -13 F.

Strengths

  • Four zones from one condenser for most of a small-to-mid home.
  • Nominal SEER2 22.5 / EER2 11.1 / HSPF2 10 on a budget line.
  • Value-priced four-zone from an online-focused brand.

Weaknesses

  • Not ENERGY STAR certified and not AHRI cold-climate designated.
  • Heating falls off in deep cold, down to 26,000 BTU at 5F.
  • 35,000 BTU across four zones is modest per room; size each head.

Climate suitability

Minimum heating ambient
-13 F[1]
Rated heating at 5F
26,000 BTU/hNon-Ducted Indoor Units[3]
Rated heating at 17F
27,400 BTU/hNon-Ducted Indoor Units[3]
Rated heating at 47F
36,000 BTU/hNon-Ducted Indoor Units[3]

Specifications

Show
Manufacturer
Della
Brand
Della
Product line
Optima Series Multi-Zone
Model number
048-TLP-MODU-1D4
Indoor unit model
Indoor heads are selected separately on a multi-zone system
Outdoor unit model
048-TLP-MODU-1D4
Number of zones
4
Max indoor units
4 units[2]
Rated cooling capacity
35,000 BTU/hNon-Ducted Indoor Units[3]
Rated heating capacity
36,000 BTU/hNon-Ducted Indoor Units[3]
Voltage
230 V[2]
MCA
22 A[2]
Maximum fuse or breaker size
35 A[2]
Breaker needed
not published
SEER2
22.5 SEER2Non-Ducted Indoor Units[3]
EER2
11.1 EER2Non-Ducted Indoor Units[3]
HSPF2 (Region 4)
10 HSPF2Non-Ducted Indoor Units[3]
HSPF2 (Region 5)
Certified per indoor-unit combination, not per outdoor unit
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
Indoor heads are selected separately on a multi-zone system
Outdoor noise rating
65 dBA[2]
Indoor weight
Indoor heads are selected separately on a multi-zone system
Outdoor weight
145.5 lb[2]
Refrigerant
R-454B[3]
Refrigerant charge
98.84 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
Indoor heads are selected separately on a multi-zone system
Maximum line-set length
263 ft[2]
Max line set per indoor
98 ft[2]
Maximum elevation difference
49 ft[2]
Max height between indoor units
not published
Wi-Fi support
Indoor heads are selected separately on a multi-zone system
Energy Star status
Not ENERGY STAR certified[4]
AHRI certification number
218472766Non-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
We could not find this exact model in stock at a retailer we work with when we last checked on 2026-07-28.
Available retailers
not published
Manual links
AHRI public detail 218472766, Della 048-TLP MODU Series Manual, ENERGY STAR exact row 218472766, Della Optima Series Multi-Zone installation manual for 048-TLP-MODU-1D4, Della Optima Series Multi-Zone official product page example for 048-TLP-MODU-1D4, HVACDirect exact-offer audit for 048-TLP-MODU-1D4, Della Optima Series Multi-Zone manual technical tables for 048-TLP-MODU-1D4
Specification sheet
Della Optima Series Multi-Zone manual technical tables for 048-TLP-MODU-1D4
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, 18k, 24k

    Model numbers
    • 9k: 048-CC-9K2V-IN
    • 12k: 048-CC-12K2V-IN
    • 18k: 048-CC-18K2V-IN
    • 24k: 048-CC-24K2V-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, 18k, 23k, 24k

    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
    • 18k: 048-TL-18K2VB-21S-IN
    • 18k: 048-TP-18K2V-23S-C-IN
    • 18k: 048-TP-18K2V-23S-IN
    • 23k: 048-TP-23K2V-23S-C-IN
    • 23k: 048-TP-23K2V-23S-IN
    • 24k: 048-TL-24K2VB-21S-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
22 A[2]
Breaker needed
not published
Maximum breaker size
35 A[2]
Maximum fuse size
35 A[2]
Maximum cooling current
not published
Maximum heating current
not published
Manufacturer wire notes
10 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
Indoor heads are selected separately on a multi-zone system
Maximum line-set length
263 ft[2]
Max line set per indoor
98 ft[2]
Max height between indoor units
not published
Indoor dimensions
Indoor heads are selected separately on a multi-zone system
Outdoor dimensions
42.57 x 18.42 x 33.58 in[2]
Indoor weight
Indoor heads are selected separately on a multi-zone system
Outdoor weight
145.5 lb[2]
Drain size
not published

Related systems and guides

Frequently asked questions

Can I install the Della Optima Series Multi-Zone 4-Zone 35,000 BTU R-454B 208/230V (048-TLP-MODU-1D4) myself, or do I need a pro?
Della Optima Series Multi-Zone 4-Zone 35,000 BTU R-454B 208/230V (048-TLP-MODU-1D4) 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 4-Zone 35,000 BTU R-454B 208/230V (048-TLP-MODU-1D4) keep heating in a cold winter?
The manufacturer publishes 26,000 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 Della Optima Series Multi-Zone 4-Zone 35,000 BTU R-454B 208/230V (048-TLP-MODU-1D4) need?
Published electrical requirements: 230 V voltage, 22 A minimum circuit ampacity, and 35 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 263 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 Series Multi-Zone official product-page evidence for 048-TLP-MODU-1D4Sourced - 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 #218472766 - 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 #218472766 - 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