Sirius Heat Mini-Split Heat Pumps - Multi-Zone

When temperatures drop, rely on the consistent performance of Sirius Heat™.

Tested to perform, our Sirius Heat technology not only provides dependable temperature control in extreme conditions but also high efficiency with up to a 22.6 SEER2 rating. Customers experience up to 100% heating capacity at 0°F, heating operation down to -22°F, and low ambient cooling down to 5°F. Durastar’s Sirius Heat mini-split heat pumps – multi-zone – are customizable for up to 5 zones within your home. When it’s exceptionally cold outside, you need an exceptional system.

Durastar carries a variety of high-quality and dependable mini-split solutions. Be sure to learn more about our Outdoor Single-Zone Heat Pumps, Outdoor Multi-Zone Heat Pumps, and Sirius Heat™ Single-Zone Heat Pumps. Then, take a look at our Indoor Units and discuss with your contractor the ideal combination of products to ensure optimal heating and cooling in your space.

Our Sirius Heat mini-split heat pumps – multi-zone as well as our mini-split offering are available nationwide for direct purchase through Build with Ferguson. We recommend working with your HVAC contractor to select and install the best combination of Durastar products for your project. The product warranty may be voided if it is not installed by a licensed HVAC contractor.




No one stands behind their brand like we do. Durastar offers durable airflow during even the harshest heating and cooling conditions. In addition, our warranty provides maximum coverage for total peace of mind.

Extended warranty options are available for both parts and labor. Talk to your contractor for more information.

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Sirius Heat Mini-Split Heat Pumps - Multi-Zone Features

  • High heating capacity at 0 Deg F
  • Included base pan heater
  • Variable speed inverter compressor
  • Anti-corrosion fin coating
  • Quiet operation
  • Operational temperature down to -22 Deg F
  • Refrigeration port adaptors included


  • AMP: 9
  • Application: Residential
  • Auto Switching Heat/Cool?: Yes
  • BTU: 18000
  • BTU Cooling Rating: 18000 Btu/h
  • BTU Heat Rating: 20000 Btu/h
  • CFM: 2129 ft3/min
  • Color/Finish Category: Whites
  • Compressor Type: Inverter
  • Decibel Rating (dB): 61 dB
  • Depth: 16-1/8 in
  • Depth of Trench: 16-1/8 in
  • EER: 13
  • Energy Star Compliant: Yes
  • Green Product: Yes,Energy Star
  • Height: 31-7/8 in
  • HSPF: 9.7
  • Indoor / Outdoor: Outdoor
  • Liquid Line (OD): 1/4 in
  • MBH: 18
  • Phase: Single Phase
  • Refrigerant: R-410A
  • SEER: 21
  • Specifications - CSA Certified: CSA-C22.2 No. 236
  • Specifications - MA Approved: No
  • Specifications - UL Listed: UL 1995
  • Suction Line (OD): 3/8 in
  • Tonnage: 1.5 Ton
  • Volts: 208/230V
  • WaterSense Labeled: No
  • Watts: 1640 W
  • Weight: 138.2 lb
  • Width: 37-1/4 in
  • Zones: 2

Frequently Asked questions

What is a mini-split system?

Mini-splits are a ductless solution to heating and cooling individual rooms or spaces. They are discrete and reduce installation efforts.

Can I have a multi-zone mini-split system?

Yes! Mini-splits can be configured for single-zone or multi-zone applications. Each unit is connected to one outdoor unit.

Do I need a contractor to purchase and install my mini-split system?

You can purchase Durastar’s mini-split units directly from Build with Ferguson. However, we recommend working with a contractor to ensure you acquire the best combination of products, install the system properly, and take full advantage of the products’ warranty. Please note that warranties may be voided if not installed by a licensed professional.

What is an HVAC evaporator coil?

Evaporator coils are located inside your home and work with your air conditioner and furnace. Depending on whether you are heating or cooling a space, the coils pull in existing air to cool it or they add heat to warm it up. In essence, coils are one of the most important pieces to your HVAC system and are responsible for the heat exchange.

What is the benefit of an all-aluminum coil?

Unlike copper which may rust over time, all-aluminum coils do not. In addition, they are more resistant to micro-leaks which increases the longevity and efficiency of your unit.

What is the difference between an 'A' coil and 'N' coil?

‘A’ coils are formed using two slabs of fins – these types of coils have a surface area similar to a slab coil, however, they are installed without transition ducting. Alternatively, ‘N’ coils use three fin slabs. This arrangement increases the coil’s surface area and, therefore, accommodates more refrigerant. As a result, it operates more efficiently and generates more heat.

How to talk to your contractor

Learn how to talk the talk with a few of our top tips. We cover important questions to ask your HVAC contractor, common mistakes when buying a new system, and more.

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