iStore vs Chromagen: Which Heat Pump Is Better? (2026)
Quick Verdict
Chromagen is the more efficient choice with a higher COP rating, meaning lower running costs over time.
Side-by-Side Comparison
| Feature | iStore | Chromagen |
|---|---|---|
| Price range (installed) | $2,800 - $4,200 | $2,800 - $4,200 |
| COP (efficiency) | 3.2 | 3.5Higher |
| Tank warranty | 5 years | 5 years |
| Compressor warranty | 5 years | 5 years |
| Noise level | 49dB | 48dBQuieter |
| Annual running cost | ~$340/yr | ~$320/yrLower |
| Refrigerant type | R134a | R134a |
| Country of manufacture | Australia | Israel |
| Australian made | Yes | No |
| Best for | Budget-conscious households wanting maximum rebate impact and simple installation | Budget-conscious buyers wanting a reliable mid-range heat pump |
Price Comparison
iStore starts from $2,800 installed (before rebates), while Chromagen starts from $2,800. 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. iStore achieves a COP of 3.2, while Chromagen reaches 3.5. The Chromagen is 9% more efficient, which translates to roughly $20 less per year in running costs. Over a 10-year lifespan, that efficiency advantage adds up to approximately $200 in savings.
Warranty Comparison
iStore offers a 5-year tank warranty and 5-year compressor warranty. Chromagen offers a 5-year tank warranty and 5-year compressor warranty. Both brands offer the same tank warranty length, so warranty coverage is comparable.
Noise Comparison
Noise is an important consideration, especially for suburban installations where the unit may be close to bedrooms or neighbouring properties. iStore operates at 49dB, while Chromagen runs at 48dB. The Chromagen is quieter at 48dB. At this level, you may want to consider placement carefully to avoid disturbing bedrooms or neighbours.
Climate Suitability
The type of refrigerant a heat pump uses significantly affects its performance in cold weather. iStore uses R134a refrigerant, while Chromagen 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
iStore
Pros
- Most affordable option
- Australian company
- Simple installation
- Good rebate value (low cost means rebates cover more)
- Widely available
Cons
- Lower COP than premium brands
- Shorter warranty
- Noisier than split systems
- Higher running costs long-term
Chromagen
Pros
- Competitive pricing
- Good range of sizes
- Widely available through plumbing suppliers
- Established brand (60+ years)
- Decent efficiency for the price
Cons
- Not the quietest (48-50dB)
- Standard R134a refrigerant
- Shorter warranty than premium brands
- Not Australian-made
Which Should You Choose?
Choose iStore if...
- You want Australian-made (eligible for higher VIC rebate tier of $1,400 vs $1,000)
Choose Chromagen if...
- You want the best efficiency and lowest running costs (COP 3.5 vs 3.2)
- Quiet operation matters to you (48dB vs 49dB)
- You want lower annual running costs (~$320/yr vs ~$340/yr)