Rheem vs Rinnai vs Bosch — which hot water brand is best in Australia?

These are the three brands we install and repair most often across Melbourne. We see how they perform in the real world — in all kinds of Melbourne homes, water conditions, and climates. Here's our honest assessment of each.

Brand overview

Brand	Origin	Best known for	Warranty (typical)	Price range
Rheem	Australian-owned	Electric & gas storage, solar	5–10 years	Mid to premium
Rinnai	Japanese	Gas continuous flow	5–12 years	Mid to premium
Bosch	German	Gas continuous flow, heat pump	5–10 years	Mid to premium

Rheem

Rheem is Australia's most recognised hot water brand and has been here since 1936. Their storage systems — both gas and electric — are the most widely installed in Melbourne, which means parts and service are readily available from virtually any plumber. Their solar systems are also well-regarded.

The reliability of Rheem storage systems is solid across the board. Their continuous flow range is competitive but, in our experience, Rinnai has a slight edge in that category. Rheem's biggest advantage is parts availability — if something needs replacing, we can almost always source the part the same day.

Flow Now view on Rheem: Our top pick for electric and gas storage systems. Great value, widely supported, and parts are everywhere. The Stellar and Optima gas storage models are particularly popular with Melbourne families.

Rinnai

Rinnai is the market leader in gas continuous flow (instantaneous) hot water in Australia, and for good reason. Their Infinity and B16 series are genuinely excellent — efficient, reliable, and very well built. If you want a continuous flow gas system, Rinnai is our first recommendation.

Rinnai's storage systems are also solid, and their heat pump range has improved significantly in recent years. The brand has strong after-sales support in Victoria and their warranty claims process is straightforward to deal with.

Flow Now view on Rinnai: Our top pick for gas continuous flow. The Infinity series is hard to beat for reliability and running efficiency. If you're upgrading from a storage system to continuous flow, Rinnai is where we'd start.

Bosch

Bosch is the most premium of the three brands and their products reflect that — higher build quality, more sophisticated technology, and typically a higher price tag. Their continuous flow systems are excellent and compete directly with Rinnai's top models. Their heat pump systems are among the best available in Australia.

The main considerations with Bosch are price and parts. Premium models cost more upfront, and for some models, parts can be harder to source quickly in Melbourne compared to Rheem or Rinnai. That said, for the right customer — particularly those investing in a heat pump — Bosch is a top-tier choice.

Flow Now view on Bosch: Our top pick for heat pump systems. The Bosch Compress range is excellent and well worth the premium if you're going down the heat pump path. For gas, it's strong but competes closely with Rinnai at a higher price.

The verdict — which brand should you choose?

Our recommendation by system type

Gas storage: Rheem — best parts availability, great reliability, strong warranty.

Gas continuous flow: Rinnai — market leader for good reason, unmatched reliability.

Heat pump: Bosch — premium build quality, best efficiency figures.

Solar: Rheem — longest track record in Australia, excellent support network.

Budget option: Rheem electric storage — reliable, well-supported, lowest upfront cost.

All three brands are solid choices and any of them will serve you well with proper installation and maintenance. The brand matters less than choosing the right system type for your home. Call us and we'll help you decide — we install all three and have no brand preference beyond what's best for your situation.