MRCOOL® E Star DIY 3rd Gen 18k BTU 20 SEER Ductless Mini-Split Heat Pump Condenser-208-230V/60Hz
Component — Not a Complete System
This is the outdoor unit only. To run, you also need a matching indoor air handler and a refrigerant line set. Looking for the complete system instead? Browse complete 18,000 BTU systems.
SKU DIY-18-HP-C-230B
With Incentives
Save up to $83920 SEER2 meets CEE Tier 2 (≥16). Find your state's rebate
Customize it — compatible add-ons only
Wall bracket or rubber risers lift the condenser above snow, mud, and runoff.
Clean channel for the lines running down your exterior wall.
Tool kit, hole saw, and wrench — everything the self-install calls for.
Maintenance kit and coil cleaner keep efficiency (and the warranty) healthy.
MrCool DIY factory warranty — register after install to activate the full coverage tiers.
Sizing Help
Not sure if 18K BTU is right for your space?
Proper sizing prevents short-cycling, high bills, and premature failure. Our sizing tool takes 60 seconds.
Resources
Brochures & Manuals
Description
MRCOOL® E Star DIY 3rd Gen 18k BTU 20 SEER Ductless Mini-Split Heat Pump Condenser-208-230V/60Hz
What's in the Box
Here's what you'll receive with your order
Outdoor Condenser Unit
Heat pump condenser with Gold Fin anti-corrosion coating
Installation Hardware
Mounting brackets and hardware kit
Owner Manual
Installation and operation guide
Key Specifications
18000BTU
Cooling Capacity
750sq ft
Coverage Area
208-230V
Voltage
18000BTU
Heating Capacity
MRCOOL® E Star DIY 3rd Gen 18k BTU 20 SEER Ductless Mini-Split Heat Pump Condenser-208-230V/60Hz — Model Details
What this specific model is sized for, how it installs, how it performs, and what it costs to run.
Room & Space Coverage — 18,000 BTU
The MRCOOL® E Star DIY 3rd Gen 18k BTU 20 SEER Ductless Mini-Split Heat Pump Condenser-208-230V/60Hz delivers 18,000 BTU of cooling and heating capacity (1.5-ton class), sized for spaces up to 750 sq ft in standard 8-ft ceiling rooms with average insulation. At this capacity the unit handles medium primary rooms, master suites with attached bath, converted garages, and workshops. If your space includes a sunny west-facing wall or a finished bonus room above it, lean toward the upper end of the coverage range.
Efficiency & Operating Cost
This unit is rated at 20 SEER2. SEER2 measures seasonal cooling efficiency — higher is better — and 20 puts this in the premium efficiency tier. For heating performance it carries a 10 HSPF rating, which translates to roughly 300–350% heating efficiency versus resistance electric — one kilowatt-hour of electricity moves three kWh of heat into the space at mild outdoor temperatures. Running the unit 8 hours a day at full load draws roughly 216 kWh/month — about $35/month at the US average $0.16/kWh residential rate. Real-world draw is usually 30–50% lower because inverter compressors modulate down most of the time.
Cold & Hot Weather Operating Range
This system produces rated heating capacity down to 5°F ambient, strong performance for cold-climate applications where a secondary heat source isn't needed for most of winter. The inverter-driven compressor modulates between roughly 30% and 110% of rated capacity instead of cycling on/off, which both extends runtime at extreme temperatures and holds tighter setpoints (±0.5°F) versus ±2–3°F on fixed-speed units.
Power & Electrical Requirements
Power requirement: 208-230V 1-phase 60Hz (standard US residential 240V service). Minimum circuit ampacity is 15A with a maximum overcurrent protection of 20A. Wire the outdoor unit with 12 AWG copper on a dedicated 20A double-pole breaker (or single-pole at 120V), with a disconnect within sight of the condenser per NEC 440.14.
Install Difficulty — DIY-Friendly
This DIY 3rd Gen E STAR Condenser system ships with a pre-charged Quick Connect line set — no HVAC license, no vacuum pump, no refrigerant gauges. The pre-charged fittings use a hand-tightened mechanical seal that a homeowner completes in 15 minutes per connection. Typical install time from unboxing to first cool air is 4–8 hours for a single-head system. The system supports line set lengths up to 98ft; longer runs are available as accessory kits. Plan the shortest practical route — every 10ft of line set adds roughly 2% capacity loss. Ships with R-410A refrigerant. R-410A is a mature, widely-serviced refrigerant; service technicians and parts are available at any HVAC supply house.
Warranty & Certifications
When you register your unit within 60 days of purchase you get 5-year on parts and 7-year on the compressor through MrCool's registered warranty program. AHRI certified — required for most utility rebate and tax credit programs.
What's in the Box & Compatibility
Ships as a Mini-Split with remote control included.
Product Details
Introducing the MRCOOL® E Star DIY 3rd Gen 18k BTU 20 SEER Ductless Mini-Split Heat Pump. These are ductless mini-split heat pumps with enhanced WIFI engineered to make setup not only quick and easy, but the. MRCOOL DIY E Star Series is flexible enough to be installed virtually anywhere without requiring specialized tools or expensive equipment. The 18,000 BTU unit is 20 SEER and designed to heat and cool up to 750 square feet efficiently and effectively. Our SmartHVAC app is compatible with Amazon Alexa and Google assistant. You can also control your DIY anywhere with your Apple or Android smart device with an Internet connection. Doing it yourself has never been easier with the new MRCOOL DIY E Star Series. This unit is shipped in two boxes.
Specifications
| Cooling Capacity | 18,000 BTU |
| Heating Capacity | 18,000 BTU |
| SEER2 Rating | 20 |
| Voltage | 208-230 V |
| Refrigerant | R-410A |
| Coverage Area | 750 sq ft |
| Max Line Set | 98 ft |
| SEER Rating | 20 |
| HSPF | 10 |
| Tonnage | 1.5 Ton |
| Phase | 1 |
| Refrigerant Type | R-410A |
| Liquid Line Size | 1/4 |
| Suction Line Size | 1/2 |
| Country of Origin | China |
Features
- Our Easy DIY installation: pre-charged quick connect line doesn't require special tools, equipment, or training
- SmartHVAC app: WIFI control - control your DIY anywhere with your Apple or Android smart device and an Internet connection
- Variable-speed DC inverter compressor technology cuts operating costs
- Low ambient cooling: cooling down to 5?F exterior temperatures ? the ideal system for computer server rooms, greenhouses, and any other applications that require cooling all year
- The unit is 20 SEER and designed to heat and cool a single 750 square foot space
- 7-Year compressor warranty and 5-year parts warranty
- Auto-restart: - power outage? No worries, the MRCOOL DIY E star Series auto-restart has the unit running again immediately
- Gold Fin® condenser: corrosion-resistant coastal living - don't worry, our condenser is built to resist long term corrosion
- Louver position memory remembers so you don't need to - horizontal louver automatically moves to the same position you set the last time the unit was turned on
- Automatic leakage detection technology to alert you should a problem arise
Frequently Asked Questions
Everything you need to know about this product
What size room will the MRCOOL® E Star DIY 3rd Gen 18k BTU 20 SEER Ductless Mini-Split Heat Pump Condenser-208-230V/60Hz cool?
Can I install this myself without an HVAC license?
Is this unit eligible for the federal 25C tax credit?
How cold can it get outside before this heat pump stops heating?
What electrical circuit do I need for installation?
What warranty do I get?
How fast does HVACZAR ship this unit?
What if it arrives damaged or I change my mind?
What is the warranty on the MRCOOL® E Star DIY 3rd Gen 18k BTU 20 SEER Ductless Mini-Split Heat Pump Condenser-208-230V/60Hz?
How long does shipping take?
What size room does 18,000 BTU cover?
What is the efficiency rating?
Do you offer returns?
How can I pay?
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Ships Nationwide — Shop by State
We deliver the MRCOOL® E Star DIY 3rd Gen 18k BTU 20 SEER Ductless Mini-Split Heat Pump Condenser-208-230V/60Hz to all 50 states via FedEx, UPS, and truck freight. Each state page lists local rebate programs and utility incentives.