2.5 kWRinnai T Series 2.5kW Split System
The 2.5kW Rinnai T Series Split (system HSNRT25B: indoor HINRT25B, outdoor HONRT25B) is sized for standard bedrooms and small home offices. As a guide, it cools a room of up to about 18 to 21 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. It is the smallest capacity in the range. If the space is bigger or sun-exposed, step up to the 3.5kW.
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 2.5 kW options, see every 2.5kW split system ranked by running cost, or ask about supply and installation.
About $154 a year at the current Sydney median electricity rate: $41 of cooling plus $113 of heating, from the official GEMS test figures.
The Rinnai T Series 2.5kW uses 125 kWh per year for cooling and 340 kWh per year for heating according to official government test data for Sydney's climate zone. These figures come from the GEMS energy label and reflect standardised test conditions, not measured household usage.
The unit carries a 7-star cooling efficiency rating and a 3-star heating efficiency rating under the zoned label for Sydney. It has a rated cooling efficiency (AEER) of 4.95 and a rated heating efficiency (ACOP) of 4.24. The system uses R32 refrigerant.
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 | HINRT25B / HONRT25B |
| Series | Rinnai T Series Split |
| System type | Split System |
| Capacity | 2.5 kW |
| Refrigerant | R32 |
