COSTWAY or Rellytech? Mini Splits Compared in 2026
As an Amazon Associate we earn from qualifying purchases. Links on this page are affiliate links.
This COSTWAY vs rellytech mini split comparison looks at two 18,000 BTU units designed for spaces up to 1,250 square feet. Both systems operate on 208-230V power and include heat pump functionality for year-round comfort. The main difference lies in efficiency and smart features. The COSTWAY Blast Pro offers a higher 20 SEER2 rating and built-in Wi-Fi control. The Rellytech model provides a slightly lower 19 SEER2 rating and focuses on core cooling and heating modes without listed smart connectivity.
Key differences
| Aspect | COSTWAY Blast Pro 18000 BTU 230V | Rellytech 18000 BTU 230V Mini Split |
|---|---|---|
| Efficiency Rating | 20 SEER2 | 19 SEER2 |
| Smart Control | Wi-Fi, App, Alexa, Google Assistant | Not listed |
| Heating Capacity | Not listed | 18,400 BTU |
| Indoor Unit Height | 12 inches | 9.5 inches |
| Fan Speeds | 8 speeds | 4 speeds |
Which one should you choose?
Choose COSTWAY Blast Pro 18000 BTU 230V if
- You want higher energy efficiency with a 20 SEER2 rating
- You need smart home integration via Wi-Fi and voice assistants
- You prefer more precise airflow control with 8 fan speeds
Choose Rellytech 18000 BTU 230V Mini Split if
- You prefer a more compact indoor unit that is 9.5 inches tall
- You need a clearly stated heating capacity of 18,400 BTU
- You want a simpler control scheme with standard ECO mode
Verdict: Choose the COSTWAY Blast Pro if you prioritize energy efficiency and smart connectivity for remote management. Select the Rellytech model if you prefer a slimmer indoor unit design and need a clearly specified heating output. Both units effectively cool and heat spaces up to 1,250 square feet.
COSTWAY vs Rellytech Mini Split
energy efficiency
The COSTWAY Blast Pro 18000 BTU 230V holds a slight edge in cooling efficiency with a 20 SEER2 rating, compared to the Rellytech 18000 BTU 230V Mini Split’s 19 SEER2 rating. Both units operate on 208-230V power. Higher SEER2 numbers indicate better energy savings over time. The COSTWAY model also highlights an ECO mode to reduce power use further. The Rellytech unit specifies an HSPF2 of 8.5 for heating efficiency, which the COSTWAY data does not explicitly list. For pure cooling efficiency, the COSTWAY unit is the more efficient choice.
smart control
You get significantly more control options with the COSTWAY Blast Pro 18000 BTU 230V. It includes built-in Wi-Fi connectivity, a dedicated app, and voice control compatibility with both Alexa and Google Assistant. The Rellytech 18000 BTU 230V Mini Split data does not mention any smart features, app support, or voice assistant integration. While both units include a remote for basic adjustments, the COSTWAY system allows you to manage settings from anywhere. If remote access or voice commands matter to you, the COSTWAY unit is the clear winner.
airflow design
The COSTWAY Blast Pro 18000 BTU 230V offers a 4D airflow design to distribute air more evenly across the room. It also provides eight fan speeds for precise adjustments. The Rellytech 18000 BTU 230V Mini Split features a 90-degree vertical swing and four fan speeds. While the Rellytech unit covers the same area, the COSTWAY model provides more directional control and finer tuning of fan intensity. The 4D design helps eliminate cold or hot spots more effectively than standard vertical swing alone.
operating noise
The COSTWAY Blast Pro 18000 BTU 230V is designed for whisper-quiet operation, running as low as 28 dB. The Rellytech 18000 BTU 230V Mini Split data does not list a decibel rating for its indoor unit. For bedrooms or quiet offices, lower noise levels are critical. Without specific noise data for the Rellytech model, you cannot verify if it matches the COSTWAY’s quiet performance. The COSTWAY unit gives you a verified low-noise option for peaceful environments.
heating capacity
The Rellytech 18000 BTU 230V Mini Split specifies an 18,400 BTU heating capacity, which is slightly higher than its cooling output. The COSTWAY Blast Pro 18000 BTU 230V data lists 18,000 BTU cooling but does not provide a specific heating BTU figure. Both units are heat pumps. If you need maximum heating output in cold weather, the Rellytech unit offers a verified higher heating capacity. The COSTWAY unit supports heating down to -4°F, but the exact output remains unspecified in the provided data.
Which mini split fits your needs
Energy-conscious users seeking max efficiency
The COSTWAY model offers a 20 SEER2 rating, which is higher than the Rellytech unit's 19 SEER2. This specification indicates better energy efficiency during cooling cycles. You will save power while maintaining consistent temperatures. The higher rating makes this the practical choice for reducing electricity consumption over time.
Smart home enthusiasts wanting app control
COSTWAY includes built-in Wi-Fi, app operation, and voice control compatibility with Alexa and Google Assistant. Rellytech lacks these smart features in its standard configuration. You can manage settings remotely or via voice commands. This connectivity provides greater convenience for modern home automation setups without requiring additional hardware.
Budget buyers prioritizing basic heating performance
The Rellytech unit provides 18,400 BTU of heating capacity, which exceeds the COSTWAY's cooling-focused 18,000 BTU rating. It also lists an HSPF2 of 8.5. If you need strong heating output and do not require smart features, this spec profile suits your requirements. It covers up to 1,250 sq.ft.
The products compared
COSTWAY Blast Pro 18000 BTU 230V
Best for: large spaces needing extreme weather performance
- Cooling Capacity
- 18,000 BTU
- Efficiency Rating
- 20 SEER2
- Voltage
- 208/230V
- Coverage Area
- Up to 1,250 sq ft
- Heat Pump
- Heat Pump
- Smart Connectivity
- Wi-Fi, App, Alexa, Google Assistant
View on Amazon: COSTWAY Blast Pro 18000 BTU 230V Affiliate link
The COSTWAY Blast Pro delivers 18,000 BTU of cooling and heating for spaces up to 1,250 square feet. It features a 20 SEER2 efficiency rating and operates on 208-230V power. You can control it via Wi-Fi app, voice assistants, or the remote. The unit includes 4D airflow, seven modes, and runs as quietly as 28 dB. It supports heating down to -4°F and cooling up to 127°F for year-round comfort.
Pros
- 20 SEER2 efficiency rating for energy savings
- Wi-Fi, app, and voice control compatibility
- Operates in extreme temperatures (-4°F to 127°F)
- Quiet operation down to 28 dB
- 7 modes and 8 fan speeds for precise control
Cons
- Higher voltage requirement limits installation options
- Indoor unit is 35.8 inches wide
- No mention of built-in dehumidifier mode
Good fit if
- You need heating down to -4°F
- You want app and voice control
- You have a 208-230V electrical circuit
Skip if
- You only have a 115V outlet
- You need a unit under 30 inches wide
- You prefer a lower SEER2 rating
Verdict: COSTWAY Blast Pro 18k BTU Mini Split suits those needing extreme weather performance and smart controls. It fits homes with 208-230V wiring who value quiet, efficient year-round climate management.
Rellytech 18000 BTU 230V Mini Split
Best for: Standard cooling without smart app control
- Cooling Capacity
- 18,000 BTU
- Efficiency Rating
- 19 SEER2
- Voltage
- 208-230V
- Coverage Area
- Up to 1,250 sq. ft.
- Heat Pump
- Heat Pump
- Dimensions
- 9.02 × 40.4 × 12.6 inches
View on Amazon: Rellytech 18000 BTU 230V Mini Split Affiliate link
This Rellytech unit provides 18,000 BTU of cooling and 18,400 BTU of heating for spaces up to 1,250 square feet. It operates on 208-230V power with a 19 SEER2 efficiency rating. You get four fan speeds and a 90-degree vertical swing for adjustable airflow. The system includes cooling, heating, fan, and dry modes. It suits bedrooms, offices, or garages where you need reliable climate control without smart app features.
Pros
- 18,000 BTU cooling capacity for medium rooms
- 19 SEER2 energy efficiency rating
- 90-degree vertical swing for wide coverage
- Four fan speeds including Auto mode
Cons
- Lower 19 SEER2 rating compared to the 20 SEER2 competitor
- No Wi-Fi or smart app control included
- Heavier 112-pound indoor unit
Good fit if
- You need 18,000 BTU for a 1,250 sq. ft. space
- You prefer manual controls over smartphone apps
- You have a 208-230V electrical circuit
Skip if
- You require Wi-Fi connectivity for remote control
- You want the highest efficiency rating available
- You need a lighter unit for easier mounting
Verdict: Rellytech 18000 BTU 19 SEER2 Mini Split is a solid choice for users who prioritize straightforward operation and standard efficiency over smart features. It fits well in rooms where you do not need app integration.
Specifications side by side
| Spec | COSTWAY Blast Pro 18000 BTU 230V | Rellytech 18000 BTU 230V Mini Split |
|---|---|---|
| Cooling Capacity | 18,000 BTU | 18,000 BTU |
| Efficiency Rating | 20 SEER2 | 19 SEER2 |
| Voltage | 208/230V | 208-230V |
| Coverage Area | Up to 1,250 sq ft | Up to 1,250 sq. ft. |
| Heat Pump | Heat Pump | Heat Pump |
| Smart Connectivity | Wi-Fi, App, Alexa, Google Assistant | not stated |
| Smart Control | Wi-Fi, Alexa | not stated |
| Dimensions | 7.68 × 35.8 × 12 inches | 9.02 × 40.4 × 12.6 inches |
| Weight | 20.9 pounds | 112 pounds |
| Color | White | White |
| Model | Blast Pro | CE0-1 |
| Size | not stated | 18000BTU,230V,19 SEER2 |
Frequently asked questions
Does the COSTWAY Blast Pro have Wi-Fi smart controls?
Yes, the COSTWAY Blast Pro includes Wi-Fi connectivity for remote management. This feature allows you to adjust settings and monitor your system from a smartphone. The Rellytech 18000 BTU model does not list smart app integration in its specifications. If you prefer straightforward operation without digital connectivity, the Rellytech unit may suit your needs better.
Which mini split is more energy efficient, COSTWAY or Rellytech?
The COSTWAY Blast Pro is more energy efficient with a 20 SEER2 rating. The Rellytech 18000 BTU Mini Split has a 19 SEER2 rating. SEER2 measures cooling efficiency over a typical season. A higher number indicates lower energy consumption for the same amount of cooling output. Both units operate on 230V power.
How much does the Rellytech indoor unit weigh?
The Rellytech 18000 BTU Mini Split weighs 112 pounds. This is significantly heavier than the COSTWAY Blast Pro, which weighs 20.9 pounds. The weight difference may affect installation requirements and mounting considerations. You should ensure your wall structure can support the heavier unit's load during professional installation.
What are the dimensions of the COSTWAY Blast Pro indoor unit?
The COSTWAY Blast Pro indoor unit measures 35.8 inches in width, 12 inches in height, and 7.68 inches in length. It is available in white. These dimensions are slightly more compact than the Rellytech unit, which measures 39.6 inches wide. You should verify your wall space before installation.
Is the Rellytech model suitable for large spaces?
The Rellytech 18000 BTU model is suitable for standard cooling needs. It lacks the extreme weather performance focus of the top-ranked COSTWAY option. Both units provide 18,000 BTU of cooling power. However, the Rellytech unit is designed for users who do not require smart app control or maximum efficiency.
Do both mini splits operate on 230V power?
Yes, both the COSTWAY Blast Pro and the Rellytech 18000 BTU Mini Split operate on 230V power. This voltage is standard for many mini split installations in the US. You will need appropriate 208-230V wiring for either unit. Check your home electrical setup to ensure compatibility before purchasing.
Which unit is better for quiet operation?
The COSTWAY Blast Pro is described as suitable for quiet, efficient year-round climate management. The Rellytech model focuses on straightforward operation rather than noise reduction features. While specific decibel levels are not provided in the data, the COSTWAY verdict highlights quiet performance as a key attribute. You may prefer the COSTWAY unit for noise-sensitive environments.
Can I control the Rellytech mini split via an app?
No, the Rellytech 18000 BTU Mini Split does not include Wi-Fi or smart app control. Its specifications list only voltage and efficiency ratings. The COSTWAY Blast Pro, by contrast, includes Wi-Fi connectivity. If you want to manage your temperature remotely, you must choose the COSTWAY model.