The Rinnai Infinity is one of the most popular continuous flow hot water systems in New Zealand. Rather than storing heated water in a tank, it heats water on demand as it passes through the unit. The residential favourite is the Rinnai Infinity A26, delivering 26 litres per minute — enough for two showers running at once.
Advantages
Unlimited Hot Water
The primary selling point — and it delivers. Whether it's long showers, back-to-back baths, or filling a spa, the system keeps running without interruption.
Energy Efficiency
The system only heats water when you're using it, eliminating the standby losses of a traditional 180-litre cylinder that runs 24/7 whether you need hot water or not.
Space Saving
Wall-mounted on the exterior of the house. No more hot water cupboard — free up that space for a pantry or storage.
Extended Lifespan
With routine maintenance, these systems typically last 20+ years — well beyond most storage cylinders.
Established Brand
Rinnai has a strong NZ market presence with reliable parts availability and warranty support, including a 10-year heat exchanger warranty.
Considerations
Installation Cost
Typical installation costs range from $3,500 – $5,500, including the unit, gas work, plumbing, electrical, and compliance certification.
Gas Dependency
You need a natural gas or LPG connection. Adding a new gas connection increases the cost significantly.
Flow Rate Limits
While 26 litres/minute sounds like a lot, running three or four outlets simultaneously can push its limits.
Maintenance
Annual servicing is recommended, costing approximately $150 – $250 per service.
Who Is It Right For?
- Families who regularly run out of hot water
- Homes with existing gas infrastructure
- People looking to reduce energy costs long-term
- Homeowners wanting to free up cupboard space
- Properties with difficult cylinder access
Who Should Consider Alternatives?
- Budget-conscious buyers wanting the lowest upfront cost
- Properties without a gas supply
- Households with minimal hot water usage
The Verdict
For most Auckland homes with gas — yes, it's worth it. The Rinnai Infinity A26 is a proven, reliable system that pays for itself through lower running costs and a longer lifespan. We install them regularly and they rarely give trouble.