The Best Air Conditioners to Keep You Cool This Summer Quick highlights of the seven most energy-efficient air conditioners for […]
When it comes to cooling (and heating) Australian homes, Rinnai split systems are some of the most reliable and energy-efficient options on the market.
Known for their sleek design, quiet operation, and smart features, Rinnai units are ideal for every room size and climate zone.
In this guide, we’ll explore the 7 best models in the J, T, and PB Series, with recommendations based on room size, energy performance, and use case.
1. Rinnai J Series – 2.5 kW
The 2.5 kW J Series model is a standout for small bedrooms or home offices, with industry-leading energy efficiency and incredibly quiet operation.
One of the very few split systems marketed in Australia with a 9-star cooling rating (in hot climates), this equates to nearly unbelievably low operating costs. Even with its compact space-saving design, the unit features a series of smart capabilities like built-in Wi Fi, voice control, and a self-cleaning filter.
The unit is also made to operate effectively in hot outdoor temperatures—perfect for Queensland and WA houses where it’s hotter.
The indoor noise is low (as low as 22 dBA), so it’s ideal for operating at night.
2. Rinnai J Series – 3.5 kW
Slightly bigger than the 2.5 kW model, the 3.5 kW model is perfect for large bedrooms or small lounges.
It still features all the advantages of the J Series, including its high energy rating, R32 refrigerant for enhanced environmental performance, and quiet performance.
The 3.5 kW model is the ultimate compromise for owners who want powerful cooling in a mid-sized area without a substantial power bill.
3. Rinnai J Series – 5.0 kW
Designed for main living areas or medium-sized open-plan rooms, the 5.0 kW J Series system offers greater airflow and stronger temperature control.
It delivers solid performance during both summer and winter, thanks to its strong AEER rating. Like other J Series models, it comes with all the smart features you’d expect, such as app control, a timer, and auto-cleaning.
This product is particularly ideal for maintaining a steady climate in rooms that family members most frequently use.
4. Rinnai J Series – 7.0 kW
For larger lounge rooms or large open-plan living areas, the 7.0 kW J Series system can handle it.
With excellent airflow of up to 15 m and rapid cooling or heating operations, it is designed to cut through more space efficiently.
Aside from its impressive power, it still operates quietly and includes all the same intelligent features as the compact J Series models. This system is ideal for homes located in areas with fluctuating temperatures or those that require constant entertaining in larger, open spaces.
5. Rinnai PB Series – 6.0 kW
The PB Series brings additional features to the table, particularly for households in coastal or high-humidity zones.
The 6.0 kW model includes Rinnai’s Gold Guard coating, which protects the outdoor unit against salt corrosion and rust. It also supports DRED (Demand Response Enabling Device), making it suitable for households participating in peak energy load programs.
With smart airflow control and a stylish indoor unit, the PB 6.0 kW model suits families looking for both performance and longevity.
6. Rinnai PB Series – 7.0 kW
This system is built on the 7.0 kW PB system but with increased power output for larger open areas or living rooms with heavy activity.
It comes equipped with all of Rinnai’s toughness and intelligence, along with better airflow control, a silent indoor unit, and stable temperature control. The PB 7.0 kW is a great do-it-all if you want a solid, reliable system for large areas in your home.
7. Rinnai PB Series – 8.0 kW
At the top of the PB range, the 8.0 kW model delivers maximum performance for very large open-plan living or even commercial spaces.
With DRED capabilities, a self-cleaning filter system, and corrosion resistance, this unit is ideal for homes exposed to coastal weather or requiring constant comfort year-round. If you’re looking for sheer power combined with smart efficiency, this model is the go-to solution.
Rinnai Split System Comparison Table
| Model | Best Room Size | Cooling Rating | Airflow Reach | AEER / ACOP | Key Advantages |
| 2.5 kW J | 13–17 m² | 9 stars | Up to 15 m | 4.52 / 4.17 | Balanced for living areas, smart-controlled; energy-conscious |
| 3.5 kW J | 18–24 m² | 5.5 stars | Up to 15 m | ~4.4 / ~4.1* | Slightly more powerful; retains smart features; efficient for medium rooms |
| 5.0 kW J | 25–34 m² | 4.5 stars | Up to 15 m | ~4.52 / ~4.0* | Strong airflow, great for open plans; intelligent features included |
| 7.0 kW J | 35–47 m² | 4 stars | Up to 15 m | ~4.0 / ~3.9* | Corrosion-resistant, DRED enabled; smart filter cleaning |
| 6.0 kW PB | 30–40 m² | ~4 stars | 3D airflow | 3.42 / 3.85 | Corrosion-resistant, DRED-enabled; smart filter cleaning |
| 7.0 kW PB | 32–47 m² | 3.5 stars | 3D airflow | ~3.5 / ~3.7* | Stronger version of 6.0 kW; still coastal-safe and efficient |
| 8.0 kW PB | 40–54 m² | 3.5 stars | 3D airflow | ~3.4 / ~3.6* | Highest power; ideal for large open spaces; designed for long-term durability |
How to Choose the Right Rinnai Split System
Choosing the right air conditioner depends on multiple factors, not just power output. Here are some key elements to guide your decision:
| Selection Factor | Why It Matters |
| Room Size vs Power | A too-small system will not cool efficiently; a too-large system wastes energy |
| Energy Efficiency | J Series units are extremely quiet, ideal for a bedroom or nursery |
| Smart Features | All models on our list feature Wi Fi, voice control, and timers for convenience |
| Airflow Reach | For open plans, greater airflow reach (15 m or more) offers balanced comfort |
| Noise Level | J Series units are extremely quiet, ideal for bedroom or nursery |
| Climate Compatibility | PB Series deals with coastal and humid climates with rust-proof coating |
| Grid Readiness (DRED) | PB Series allows peak-load management—ideal for energy-efficient homes |
| Warranty Support | Rinnai offers up to 7 years on parts/labour, ensuring long-term dependability |
Rinnai Split Systems: Final verdict
If you’re seeking quiet operation and premium efficiency for small rooms, the 2.5 kW J Series is unmatched.
For families cooling their living areas, both the 5.0 kW J Series and 6.0 kW PB Series provide reliable performance, with the PB Series adding extra durability for harsher environments. And if your home includes large open spaces, nothing beats the 7.0–8.0 kW models for powerful climate control.
