Rainwater harvesting, greywater recycling, smart irrigation and pressure-reducing fixtures — we'll cut your water bill and your environmental footprint.
Rainwater harvesting and water conservation can cut a typical household's water use by 30–50% when tanks, low-flow fixtures and pressure reduction are combined, with payback usually in 4–8 years. AHHAC designs and installs rainwater tanks plumbed to toilets, laundry and garden, greywater recycling for larger gardens, smart irrigation and pressure-reducing valves across Sydney, Melbourne and Brisbane, with council compliance certificates included.
Reviewed by the AHHAC Technical Team — licensed plumbers & hydronic engineers, NSW Lic 262528C.How we write & review
Australian water bills are climbing fast. A typical home can cut water consumption 30–50% with the right fixture upgrades, rainwater harvesting and greywater recycling — paying back the investment in 4–8 years.
We design and install rainwater tanks, greywater treatment systems, smart irrigation controllers, and pressure-reducing/aerating tap and shower fixtures.
A rainwater tank only saves water if it is plumbed into fixtures you use every day. Plenty of tanks sit full but disconnected, feeding a single garden tap. The value comes from connecting the tank to toilets, the washing machine cold tap and irrigation, because those uses do not need drinking-quality water and run all year.
In NSW, BASIX sets water-saving targets for new homes and many alterations, and a plumbed rainwater tank is one of the most common ways to meet them. Other states and councils may have their own rules on new homes and tank placement, so we check before we specify. Tank size is a balance of roof area, rainfall and available space, and a 5,000-litre tank is a common starting point for a suburban home.
Before adding a tank, fix what is wasting water now. A cistern quietly running into the pan or a leak under the slab can lose more than a tank will save, which is why we often start with water leak detection and a pressure check. Low-flow showerheads and tap aerators are the cheapest win, and because they cut hot water use they cut energy too; a hot water heat pump takes that saving further. If you want to drink tank water, it needs sediment filtration and UV sterilisation, covered on our water filtration systems page. Upkeep is simple: clean the gutters and first-flush diverter a couple of times a year, and check the pump and changeover at each service.
Written from on-site experience by the AHHAC Technical Team.
AHHAC's in-house design and service team — licensed plumbers and hydronic engineers (Lic 262528C) who have designed and installed 2,400+ hydronic heating, cooling and hot water systems across Australia since 1998.
Every plumbing and hot water job is assessed on site, carried out by our own licensed plumbers and gasfitters to AS/NZS 3500 (plumbing) and AS/NZS 5601 (gas), pressure-tested and documented, and backed by ongoing service. Nothing is subcontracted out.
Typical savings: 30–50% with the right combination of low-flow fixtures, rainwater harvesting and pressure reduction. Payback on the package is usually 4–8 years through reduced water and waste-water bills.
Yes for laundry, toilets and garden — these uses don't need potable water. A 5,000L tank in a typical Sydney/Melbourne house captures 50–70% of total household water demand. Installation includes pump, controls and integration with your existing plumbing.
Greywater systems treat shower and laundry water for reuse on garden irrigation. They make sense for larger gardens (200m²+) and homes in water-restricted areas. Council compliance certificates included.
"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."