Rinnai Infinity Gas Continuous Flow Installation in Manly

This Manly homeowner’s existing continuous flow system had been playing up for months — slow to ignite, inconsistent water temperature, and an error code that kept flashing on the display. After 12 years of service, it was time for a new unit.

Since they were happy with continuous flow (no tank, endless hot water, compact), they wanted a like-for-like replacement with the best unit available. We recommended the Rinnai Infinity.

Why the Rinnai Infinity?

The Rinnai Infinity range includes continuous-flow units with different capacities. A rating such as 26 litres per minute is measured at a stated temperature rise; colder incoming water and simultaneous outlets reduce available flow. Sizing needs to match the household.

• 6-star energy rating — among the most efficient gas hot water systems available
• Electronic ignition avoids a standing pilot; confirm the exact model and any standby energy use
• Hot water on demand within the selected unit’s capacity
• Compact wall-mounted unit — same footprint as the old system, clean swap

Compared to the older unit it replaced, the new Infinity runs quieter, ignites faster, and has a much better energy rating. Technology improves — even within the same product category, a 12-year-old unit can’t match a current-model system for efficiency.

Warranty Coverage

Manufacturer warranties differ by model, component, installation date and use, and can have servicing or registration conditions. We explain the applicable equipment and workmanship cover with the quote; do not assume every component has the same term.

The Installation

A like-for-like continuous flow swap is one of the cleanest jobs we do. The gas connection, water lines, and flue position are all in the same spot. We disconnected the old unit, mounted the new Infinity in its place, connected everything with clean copper pipework, and had hot water running within a few hours.

The homeowner didn’t need any additional plumbing modifications — just a straight swap with an upgraded unit.

Running Costs

The September 2026 calculator reference gives about $1,094/year for gas continuous flow and $1,285/year for gas storage for three people. Gas supply is included once, no other gas appliances are assumed, and consumption is illustrative rather than a product-specific rating.

Worth Considering: Going Electric Next Time?

The same reference scenario models a heat pump at about $437/year. Actual savings depend on the system, household and tariffs. If the gas comparison already includes its supply charge, do not add that charge again as another saving.

This homeowner chose to stay with gas for now, but we walked them through the heat pump numbers so they know what’s available when this system eventually reaches end of life.