Sanden vs Rheem: Which Heat Pump Is Better? (2026)
Quick Verdict
Sanden is the more efficient choice with a higher COP rating, meaning lower running costs over time, while Rheem is more budget-friendly with a lower upfront cost starting from $3,200.
Side-by-Side Comparison
| Feature | Sanden | Rheem |
|---|---|---|
| Price range (installed) | $4,500 - $6,500 | $3,200 - $4,800Lower |
| COP (efficiency) | 5.1Higher | 3.5 |
| Tank warranty | 15 yearsLonger | 5 years |
| Compressor warranty | 6 yearsLonger | 5 years |
| Noise level | 37dBQuieter | 47dB |
| Annual running cost | ~$210/yrLower | ~$320/yr |
| Refrigerant type | CO2 (R744)Eco-friendly | R134a |
| Country of manufacture | Japan | Australia |
| Australian made | No | Yes |
| Best for | Those who want the absolute best efficiency and longest warranty, regardless of upfront cost | Homeowners who want a reliable, well-supported mid-range option from a trusted Australian brand |
Price Comparison
Sanden starts from $4,500 installed (before rebates), while Rheem starts from $3,200. That is a difference of roughly $1,300 at the entry level. Rheem is the more budget-friendly option upfront, though Sanden 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. Sanden achieves a COP of 5.1, while Rheem reaches 3.5. The Sanden is 46% more efficient, which translates to roughly $110 less per year in running costs. Over a 10-year lifespan, that efficiency advantage adds up to approximately $1,100 in savings.
Warranty Comparison
Sanden offers a 15-year tank warranty and 6-year compressor warranty. Rheem offers a 5-year tank warranty and 5-year compressor warranty. The Sanden has the stronger warranty coverage with 15 years on the tank, giving you 10 extra years of protection compared to the Rheem. 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. Sanden operates at 37dB, while Rheem runs at 47dB. The Sanden is quieter at 37dB. 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. Sanden uses CO2 (R744) refrigerant, while Rheem uses R134a. Sanden has the advantage here. CO2 (R744) refrigerant performs exceptionally well in cold climates, maintaining high efficiency even when temperatures drop below 0 degrees Celsius. R134a-based systems like the Rheem can lose efficiency in colder conditions, though they still perform well in most Australian climates.
Pros and Cons
Sanden
Pros
- Industry-leading COP of 5.1
- 15-year tank warranty (best in class)
- CO2 refrigerant
- Extremely quiet
- Proven Japanese engineering
- Best long-term value
Cons
- Highest upfront cost
- Split system requires indoor tank space
- Longer lead times from Japan
Rheem
Pros
- Well-known trusted brand
- Wide installer network
- Integrated design (simpler install)
- Competitive pricing
- Australian made and owned
Cons
- Shorter warranty than premium brands
- Lower COP than Sanden/Reclaim
- Noisier than split systems
- R134a refrigerant (less eco-friendly than CO2)
Which Should You Choose?
Choose Sanden if...
- You want the best efficiency and lowest running costs (COP 5.1 vs 3.5)
- You want a longer tank warranty (15 years vs 5 years)
- Quiet operation matters to you (37dB vs 47dB)
- You want lower annual running costs (~$210/yr vs ~$320/yr)
- You live in a colder climate and want CO2 refrigerant for better cold-weather performance
Choose Rheem if...
- You want a lower upfront cost (from $3,200 vs $4,500)
- You want Australian-made (eligible for higher VIC rebate tier of $1,400 vs $1,000)