Thermastore is one of the newer names in heat pump hot water, offering a 270L all-in-one heat pump, pitches as a “budget conscious homeowners”.

Thermastore is a sister brand of EvoHeat, one of the best-known heat pump brands in Australia.

In our Thermastore heat pump review, we look at the EvoHeat connection and run the Heatwave270 through our framework of four key factors (Cost, Reliability, Refrigerant and Maintenance).

 

 

Thermastore x EvoHeat

 

Thermastore is the sister brand of EvoHeat, one of the leading heat pump manufacturers on the market. EvoHeat launched Thermastore in July 2025, pitching EvoHeat as the premium brand with features and customer service, and Thermastore as the more budget-friendly option.

I’ve known the team at EvoHeat for a number of years now and I’m continually impressed by their commitment to quality and customer service. Whereas some manufacturers can be difficult to deal with (for example, by looking for any possible escape to avoid a warranty claim), EvoHeat do the right thing by their customers.

EvoHeat has been around since 2008 which means Thermastore is backed by a company with a long history in heat pumps, rather than a start-up.

 

 

1. Thermastore Heatwave270 Cost

 

The heat pump hot water market has three tiers (prices are fully installed, assuming a standard installation):

  1. Cheap and nasty units generally sell for less than $1,000.
  2. Good quality mid-market units are available for $1,500 to $3,500.
  3. Premium units like Reclaims and Sandens are installed for upwards of $5,000.

A standard Thermastore installation through Powrhouse costs around $2,000 – $2,500 inc GST, after rebates. That puts the Heatwave270 at the business end of the mid-market, slightly cheaper than an iStore.

 

 

2. Reliability and Warranty

 

Reliability is probably the most important factor in analysing heat pump hot water units. I like to look at a number of factors:

  • how long the current unit has been in market
  • reviews and online forums
  • warranty terms
  • the company offering the warranty

The trouble with the Heatwave270 is there isn’t much data. It’s only been on the market since around mid-2025, and there are only 8 reviews on ProductReview. They’re all 5 stars (5.0 from 8 reviews), but that’s too small a sample to draw conclusions from. Reviews of new units are also going to be positively biased, as units tend to work in the short term.

The Heatwave270 warranty is identical to EvoHeat’s:

 

 

As with EvoHeat, customers who claim the Solar Victoria rebate, VEECs or NSW ESCs (for installations after 1 March 2025) receive a 5-year whole-of-product warranty, including labour. It’s another two-tiered warranty, and we’d prefer to see one comprehensive warranty for all customers.

The strong positive is the company behind it – the Thermastore is backed by a company that has been in heat pumps since 2008 and should be around to honour any claims.

 

3. Refrigerant

 

The Heatwave270 uses Propane (R290) as the refrigerant. Propane has a Global Warming Potential (GWP) of 3 and is only bettered by Carbon Dioxide, with a GWP of 1 – no complaints here.

 

 

4. Maintenance

 

The manual asks homeowners to operate the PTR valve every six months and carry out a basic check every 12 months. It also “highly recommends” a service every three years by a technician authorised by Thermastore – replacing the tempering valve and PTR valve, and inspecting (and possibly replacing) the sacrificial anode.

The three-year service and replacement parts aren’t covered by the warranty, and the warranty is conditional on regular maintenance. Most similar units recommend a service every five years, so this will add to running costs which takes some of the shine off the lower price.

 

 

Other Factors

 

  • Noise – the Heatwave270 is rated at 49.5 dB(A), which is high compared to other mid-market units. Having said that, noise is rarely an issue with heat pumps, particularly if installed down the service-side of the house.
  • Wi-Fi – available as an optional upgrade at extra cost.
  • Size – comes in 270L only, which Thermastore says suits households of up to six people, but I would recommend for up to 4 people.

 

 

Thermastore Heat Pump Review Summary

 

The Heatwave270 is an affordable unit, and the backing of EvoHeat is a real positive for a brand this new.

I think it’s a solid choice for customers looking for a heat pump hot water unit in the mid-market.

 

If you are interested in a quote for a heat pump hot water unit, we’d love to hear from you.

 

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