Rinnai vs Midea: Which Heat Pump Is Better? (2026)
Quick Verdict
Rinnai is the more efficient choice with a higher COP rating, meaning lower running costs over time, while Midea is more budget-friendly with a lower upfront cost starting from $2,500.
Side-by-Side Comparison
| Feature | Rinnai | Midea |
|---|---|---|
| Price range (installed) | $3,350 - $4,800 | $2,500 - $3,800Lower |
| COP (efficiency) | 3.9Higher | 3.4 |
| Tank warranty | 7 yearsLonger | 5 years |
| Compressor warranty | 5 years | 5 years |
| Noise level | 45dBQuieter | 50dB |
| Annual running cost | ~$300/yrLower | ~$340/yr |
| Refrigerant type | R134a | R134a |
| Country of manufacture | Japan/Australia | China |
| Australian made | Yes | No |
| Best for | Homeowners wanting a trusted household name with the best installer availability and AU-made option | Budget buyers, rental properties, or anyone wanting the lowest possible upfront cost |
Price Comparison
Rinnai starts from $3,350 installed (before rebates), while Midea starts from $2,500. That is a difference of roughly $850 at the entry level. Midea is the more budget-friendly option upfront, though Rinnai 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. Rinnai achieves a COP of 3.9, while Midea reaches 3.4. The Rinnai 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
Rinnai offers a 7-year tank warranty and 5-year compressor warranty. Midea offers a 5-year tank warranty and 5-year compressor warranty. The Rinnai has the stronger warranty coverage with 7 years on the tank, giving you 2 extra years of protection compared to the Midea. 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. Rinnai operates at 45dB, while Midea runs at 50dB. The Rinnai is quieter at 45dB. At this level, it is similar to a quiet office and should be unnoticeable from inside most homes.
Climate Suitability
The type of refrigerant a heat pump uses significantly affects its performance in cold weather. Rinnai uses R134a refrigerant, while Midea 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
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
Midea
Pros
- Lowest upfront cost in market
- Good value for money
- Multiple size options
- World's largest appliance manufacturer
- OEM supplier for other AU brands
Cons
- Noisier than premium brands (50-52dB)
- Lower COP than competitors
- Brand perception less premium
- Shorter track record in AU market
- Not Australian-made
Which Should You Choose?
Choose Rinnai if...
- You want the best efficiency and lowest running costs (COP 3.9 vs 3.4)
- You want a longer tank warranty (7 years vs 5 years)
- Quiet operation matters to you (45dB vs 50dB)
- You want lower annual running costs (~$300/yr vs ~$340/yr)
- You want Australian-made (eligible for higher VIC rebate tier of $1,400 vs $1,000)
Choose Midea if...
- You want a lower upfront cost (from $2,500 vs $3,350)