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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

FeatureiStoreChromagen
Price range (installed)$2,800 - $4,400$2,800 - $4,200
COP (efficiency)3.23.5Higher
Tank warranty5 years5 years
Compressor warranty5 years5 years
Noise level49dB48dBQuieter
Annual running cost~$370/yr~$338/yrLower
Refrigerant typeR134aR134a
Country of manufactureAustraliaIsrael
Australian madeNoNo
Best forBudget-conscious households wanting maximum rebate impact and simple installationBudget-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 $32 less per year in running costs. Over a 10-year lifespan, that efficiency advantage adds up to approximately $320 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 publishes 49dB for its quietest model, and Chromagen publishes 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 owned and supported
  • 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
  • Units manufactured overseas

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)
  • Only the 235L and 280L use R290; the 170L is an older design
  • Shorter warranty than premium brands
  • Not Australian-made

Which Should You Choose?

Choose iStore if...

  • Budget-conscious households wanting maximum rebate impact and simple installation

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 (~$338/yr vs ~$370/yr)

Buying in Victoria? Stack up to $2,700 in rebates

Whichever brand you pick, Victorian households can stack the Solar Victoria Hot Water Rebate ($1,000-$1,400), the Victorian Energy Upgrades discount ($500-$2,000), and federal STCs ($500-$1,200) ahead of the 1 March 2027 gas ban deadline.

VIC rebate breakdown →2027 gas ban guide →

Heat pump guides

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iStore full reviewChromagen full reviewCompare all brands
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