From a one-van Sydney plumbing firm to the country's go-to specialists for hydronic heating, cooling and complex plumbing — across six showrooms and every state.
AHHAC (Australian Hydronic Heating and Cooling) is an Australian hydronic heating, cooling, hot water and plumbing specialist that began in Sydney in 1998 as AJ's Plumbing. Its in-house licensed plumbers and hydronic engineers (NSW plumbing licence 262528C) have installed more than 2,400 hydronic systems, working from six showrooms in Sydney, Melbourne, Brisbane, Canberra, Albury and Newcastle, and design every system from a room-by-room heat-loss calculation.
Reviewed by the AHHAC Technical Team — licensed plumbers & hydronic engineers, NSW Lic 262528C.How we write & review
AHHAC began life in 1998 as AJ's Plumbing — a one-van Sydney trade business with a reputation for showing up on time and fixing things properly. For two decades we ran a busy general plumbing book — bathroom fit-outs, hot water, drains, the lot.
But job after job, our installers kept being asked the same question: why is this house so cold, even with the heater on? The answer, almost always, was the heating system itself. Forced air dries out interiors, fights leaky envelopes and rattles in the night.
So in 2020 we doubled down on what we'd been quietly doing for years — designing radiant hydronic networks that just work — and launched the Australian Hydronic Heating & Cooling brand to do it at scale.
Today our crews train across Australia, New Zealand and the UK. Our designers heat-loss-model every home before a pipe is cut. And our service desk treats a six-zone underfloor system the same as a leaking laundry tap: pick up by the third ring.
We refuse to quote without a heat-loss calculation. Recommending a 24kW boiler when the house needs 11kW is how customers end up paying for comfort they'll never feel. We do the maths first.
It's the test we use to hire every tradesman. If they wouldn't be welcome on the worksite of a friend's home, they don't work on yours. References available — we encourage you to call them.
A hydronic system is a 30-year investment. We're around for the annual service, the unexpected fault, and the upgrade in 2046. Our oldest active service contract is from 2003.
Our client list spans private homeowners renovating Federation cottages, custom builders specifying high-end new builds, body corporates and strata managers running the hot-water plants of multi-residential towers, and commercial fit-out partners delivering hospitals, hotels and offices.
Don't take our word for it. Our plumbing licence and ABN are public records you can check in under a minute, and every system we install is designed, installed and commissioned by our own licensed team — never subcontracted.
Most hydronic systems that disappoint were never designed — they were guessed. This is the process we follow so yours performs the way it was quoted.
We look at the building, insulation, glazing, existing services and how you actually live in the home.
Every room's heat loss is calculated for your climate's design temperature — the number everything else is sized from.
Heat source, emitters, zoning and controls specified, with a fixed-fee design and quote back within 24 hours of the visit.
Installed by our own licensed plumbers to AS/NZS 3500 (and AS/NZS 5601 for gas) — tidy, labelled and documented.
Flow rates balanced, controls set up and the system walked through with you, with a documented handover.
Annual servicing, water-treatment checks and fault response from your nearest showroom — for decades, not months.
A one-van trade business doing bathrooms, hot water and drains — and a growing number of hydronic jobs.
A customer we still service today — proof that hydronic is a decades-long relationship.
The hydronic design-and-install work becomes its own specialist brand.
Sydney, Melbourne, Brisbane, Canberra, Albury and Newcastle — homes, builders, strata and commercial plant.
Unit 2, 27 Riverside Drive, Mayfield West NSW 2304
The biggest cost-saver on a hydronic build is good design upstream. Hand us your plans before the slab is poured and we'll save you money for the next 30 years.