Continuous-flow systems heat water on demand — never run out, smaller footprint, lower running costs than storage equivalents.
Instantaneous (or 'continuous-flow') gas systems heat water as it flows through a finned heat exchanger — only when you need it. They're the dominant choice for new Australian homes for good reason.
We install Rinnai Infinity and Rheem Continuous-Flow ranges, sized to your peak flow requirement (number of bathrooms, fixtures running simultaneously).
Almost never. Continuous-flow systems heat water on demand — every Rinnai Infinity model is rated for 6+ outlets running simultaneously with stable temperature. Practical answer: even a large family running multiple showers + dishwasher + laundry at once has zero issue.
20+ years with annual servicing. The Rinnai Infinity range carries a 12-year heat exchanger warranty — industry-leading. Modern continuous-flow systems easily outlast traditional storage tanks.
Yes — most Rinnai and Rheem continuous-flow units have a pre-heat option that keeps the heat exchanger warm, delivering hot water within 2–3 seconds of opening the tap. Optional add-on, slightly higher running cost.
"AHHAC delivered our 22-zone underfloor system on time, on budget and to spec. The crew were tidy, the documentation was thorough, and the commissioning was textbook."
"We've worked with AHHAC for 17 years. They've installed and serviced our hot water plant across three commercial buildings — and they pick up the phone on weekends."
"Three mobs quoted us; AHHAC's design was the only one based on a proper heat-loss calculation. The system runs beautifully — the others would've been oversized and expensive."