Daikin vs Rinnai: Which Heat Pump Is Better? (2026)
Quick Verdict
Daikin is the more efficient choice with a higher COP rating, meaning lower running costs over time, while Rinnai is more budget-friendly with a lower upfront cost starting from $3,350.
Side-by-Side Comparison
| Feature | Daikin | Rinnai |
|---|---|---|
| Price range (installed) | $5,500 - $8,500 | $3,350 - $4,800Lower |
| COP (efficiency) | 4.5Higher | 3.9 |
| Tank warranty | 10 yearsLonger | 7 years |
| Compressor warranty | 10 yearsLonger | 5 years |
| Noise level | 40dBQuieter | 45dB |
| Annual running cost | ~$260/yrLower | ~$300/yr |
| Refrigerant type | R134a | R134a |
| Country of manufacture | Japan | Japan/Australia |
| Australian made | No | Yes |
| Best for | Homeowners wanting the absolute best performance and warranty, especially in cold climates | Homeowners wanting a trusted household name with the best installer availability and AU-made option |
Price Comparison
Daikin starts from $5,500 installed (before rebates), while Rinnai starts from $3,350. That is a difference of roughly $2,150 at the entry level. Rinnai is the more budget-friendly option upfront, though Daikin may deliver savings through lower running costs over time. Both prices are for fully installed systems before government rebates and STCs, which can reduce the out-of-pocket cost by $1,000 to $3,000 depending on your state.
Efficiency Comparison
COP (Coefficient of Performance) is the key efficiency metric for heat pumps. A higher COP means more heat output per unit of electricity consumed. Daikin achieves a COP of 4.5, while Rinnai reaches 3.9. The Daikin is 15% more efficient, which translates to roughly $40 less per year in running costs. Over a 10-year lifespan, that efficiency advantage adds up to approximately $400 in savings.
Warranty Comparison
Daikin offers a 10-year tank warranty and 10-year compressor warranty. Rinnai offers a 7-year tank warranty and 5-year compressor warranty. The Daikin has the stronger warranty coverage with 10 years on the tank, giving you 3 extra years of protection compared to the Rinnai. A longer tank warranty can provide significant peace of mind, as the tank is the most expensive component to replace.
Noise Comparison
Noise is an important consideration, especially for suburban installations where the unit may be close to bedrooms or neighbouring properties. Daikin operates at 40dB, while Rinnai runs at 45dB. The Daikin is quieter at 40dB. At under 40dB, this is comparable to a quiet library and unlikely to cause any disturbance.
Climate Suitability
The type of refrigerant a heat pump uses significantly affects its performance in cold weather. Daikin uses R134a refrigerant, while Rinnai uses R134a. Both units use the same refrigerant type, so cold-weather performance should be comparable. R134a performs well in moderate climates but may lose some efficiency in very cold conditions.
Pros and Cons
Daikin
Pros
- Best-in-market 10yr parts AND labour warranty
- CO2 refrigerant (heats to 90C, no boost needed)
- Quietest outdoor unit in market (40dB)
- Works down to -26C
- Highest STC allocation due to CO2 efficiency
Cons
- Most expensive option in market
- Split system requires more complex installation
- Newer to AU hot water market
- Not Australian-made
Rinnai
Pros
- Australia's most trusted hot water brand
- AR Series is Australian-made (higher VIC rebate)
- Widest installer network in AU
- 340L is largest integrated residential heat pump in AU
- Smooth transition path from Rinnai gas
Cons
- Not the most efficient COP vs CO2 brands
- Only AR Series is Australian-made
- E-Series has shorter warranty
- Standard R134a refrigerant
Which Should You Choose?
Choose Daikin if...
- You want the best efficiency and lowest running costs (COP 4.5 vs 3.9)
- You want a longer tank warranty (10 years vs 7 years)
- Quiet operation matters to you (40dB vs 45dB)
- You want lower annual running costs (~$260/yr vs ~$300/yr)
Choose Rinnai if...
- You want a lower upfront cost (from $3,350 vs $5,500)
- You want Australian-made (eligible for higher VIC rebate tier of $1,400 vs $1,000)