3.5 kWRinnai T Series 3.5kW Split System
The 3.5kW Rinnai T Series Split (system HSNRT35B: indoor HINRT35B, outdoor HONRT35B) is sized for large bedrooms and smaller living rooms. As a guide, it cools a room of up to about 25 to 29 m². That is from Mitsubishi Heavy Industries' sizing chart for an insulated room: the larger figure if it faces north, the smaller if it faces east. Western sun, poor insulation and high ceilings bring it down. If the space is bigger or sun-exposed, step up to the 5kW.
Part of the Rinnai T Series Split range, Rinnai's split system line, in 5 sizes. Running costs below use the Sydney median rate; the Eastern Suburbs and Western Sydney pages cost systems on their own network tariffs. Check the size against your rooms, compare it with other 3.5 kW options, see every 3.5kW split system ranked by running cost, or ask about supply and installation.
About $247 a year at the current Sydney median electricity rate: $74 of cooling plus $173 of heating, from the official GEMS test figures.
The Rinnai T Series 3.5kW uses 222 kWh annually for cooling in Sydney's climate zone, based on official GEMS testing. It carries a 5-star energy rating for cooling efficiency. For heating, the system consumes 521 kWh per year and holds a 2.5-star energy rating under the same standardised test conditions.
The system's rated cooling efficiency (AEER) is 4.01, meaning it delivers 4.01 units of cooling for each unit of energy consumed. Its heating efficiency (ACOP) is 3.80. The unit uses R32 refrigerant. Your actual running costs depend on your usage patterns and your local electricity rate.
Source: Australian GEMS registry · median of 170 Sydney residential tariffs, including GST · Refreshed monthly · Last updated October 2026
Specifications
From the manufacturer’s published range data. We confirm the exact configuration when we quote.
About the Rinnai T Series Split range| Brand | Rinnai |
|---|---|
| Model | HINRT35B / HONRT35B |
| Series | Rinnai T Series Split |
| System type | Split System |
| Capacity | 3.5 kW |
| Refrigerant | R32 |
