SplitAtlas

Della / Serena Series Multi-Zone

Della Serena 18k R-32 208/230V 2-Zone Mini-Split

Certified capacity
17,700 BTU/h[3]
SEER2
22 SEER2[3]
Heating floor
-13 F[1]
Voltage
230 V[2]
Install path
Professional install

The Della Serena 2-Zone 18k is Della's entry two-zone system, pairing two indoor heads with one 208/230V outdoor unit on current R-32 refrigerant. It posts a nominal SEER2 of 22, EER2 12.3, HSPF2 10, is ENERGY STAR certified and AHRI cold-climate designated.

Cooling is rated at 17,700 BTU, and rated heating falls off in the cold, from 18,000 BTU at 47F to 14,700 at 17F and 14,500 at 5F. Professional installation required; dealer-quoted.

2 zonesProfessional installCurrent

Refrigerant generation

R-32 - current-generation refrigerant

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Error Codes
Della Serena Series Multi-Zone 2-Zone 18,000 BTU R-32 208/230V (048-MS-18K-MODU) 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

(22.0 SEER2) among 18k systems

Heating efficiencyBelow average

(10.0 HSPF2) among 18k systems

Cold-weather performanceAbove average

(80.6% heat retained at 5F; -13 F heating floor) among 18k systems

Feature setTop quartile

(6 verified features) across the catalogue

Documentation & partsBelow average

(6 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

17,700BTU/hNon-Ducted Indoor Units[3]

Rated heating

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

Buyer review snapshot

Best for / skip if

Best for

  • 2-zone projects in the 18k outdoor capacity class.
  • High-efficiency shortlists; SEER2 is 22.

Install difficulty

Professional flared-line install
  • Electrical: 230V; MCA 15 A; breaker/fuse 20 A.
  • Line set: Flared line connections; precharged 25 ft; max 82 ft.
  • 2-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

Install path
This is professional-install equipment; no verified current retail offer is attached.
Structured ratings
Certification: ENERGY STAR certified, ENERGY STAR cold-climate certified and AHRI cold-climate designated. Refrigerant: current low-GWP R-32. Minimum heating ambient: -13 F.

Strengths

  • Entry two-zone with a certified nominal SEER2 22 / EER2 12.3 / HSPF2 10.
  • Value-priced certified two-zone from an online-focused brand.

Weaknesses

  • Rated heating falls off in deep cold, down to 14,500 BTU at 5F.
  • 17,700 BTU across two zones is modest per room; size each head.

Climate suitability

Minimum heating ambient
-13 F[1]
Rated heating at 5F
14,500 BTU/hNon-Ducted Indoor Units[3]
Rated heating at 17F
14,700 BTU/hNon-Ducted Indoor Units[3]
Rated heating at 47F
18,000 BTU/hNon-Ducted Indoor Units[3]

Specifications

Show
Manufacturer
Della
Brand
Della
Product line
Serena Series Multi-Zone
Model number
048-MS-18K-MODU
Indoor unit model
Indoor heads are selected separately on a multi-zone system
Outdoor unit model
048-MS-18K-MODU
Number of zones
2
Max indoor units
2 units[2]
Rated cooling capacity
17,700 BTU/hNon-Ducted Indoor Units[3]
Rated heating capacity
18,000 BTU/hNon-Ducted Indoor Units[3]
Voltage
230 V[2]
MCA
15 A[2]
Maximum fuse or breaker size
20 A[2]
Breaker needed
not published
SEER2
22 SEER2Non-Ducted Indoor Units[3]
EER2
12.3 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
54 dBA[2]
Indoor weight
Indoor heads are selected separately on a multi-zone system
Outdoor weight
75 lb[2]
Refrigerant
R-32[3]
Refrigerant charge
38.8 oz[2]
Manufacturer coverage
not published
Line-set size
1/4 in liquid / 3/8 in suction
Included line-set length
Indoor heads are selected separately on a multi-zone system
Maximum line-set length
82 ft[2]
Max line set per indoor
82 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
ENERGY STAR certified[4]
AHRI certification number
217175305Non-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 217175305, ENERGY STAR exact row 217175305, Della Serena Series Multi-Zone installation manual for 048-MS-18K-MODU, Della Serena Series Multi-Zone official product page example for 048-MS-18K-MODU, HVACDirect exact-offer audit for 048-MS-18K-MODU, Della Serena Series Multi-Zone manual technical tables for 048-MS-18K-MODU
Specification sheet
Della Serena Series Multi-Zone manual technical tables for 048-MS-18K-MODU
Last sourced date
Jul 28, 2026

Electrical requirements

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

Installation considerations

Show
Liquid line
1/4 in[2]
Suction line
3/8 in[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
82 ft[2]
Max line set per indoor
82 ft[2]
Max height between indoor units
not published
Indoor dimensions
Indoor heads are selected separately on a multi-zone system
Outdoor dimensions
34.65 x 13.90 x 21.93 in[2]
Indoor weight
Indoor heads are selected separately on a multi-zone system
Outdoor weight
75 lb[2]
Drain size
not published

Related systems and guides

Frequently asked questions

Can I install the Della Serena Series Multi-Zone 2-Zone 18,000 BTU R-32 208/230V (048-MS-18K-MODU) myself, or do I need a pro?
Della Serena Series Multi-Zone 2-Zone 18,000 BTU R-32 208/230V (048-MS-18K-MODU) 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 Serena Series Multi-Zone 2-Zone 18,000 BTU R-32 208/230V (048-MS-18K-MODU) keep heating in a cold winter?
The manufacturer publishes 14,500 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 Serena Series Multi-Zone 2-Zone 18,000 BTU R-32 208/230V (048-MS-18K-MODU) need?
Published electrical requirements: 230 V voltage, 15 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 82 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 Serena Series Multi-Zone official product-page evidence for 048-MS-18K-MODUSourced - manufacturer product page

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

  2. Della: Della Serena Series Multi-Zone official manual technical table for 048-MS-18K-MODUSourced - manufacturer technical document

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

  3. AHRI certificate #217175305 - 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 #217175305 - search ENERGY STARSourced - Energy Star listing

    Covers performance_spec.energy_star_cold_climate, Energy Star status

Last updated

Jul 28, 2026