High-efficiency hydronic circulating pumps — the heart that moves heated and chilled water through your system. AHHAC supplies Grundfos and Wiseliving circulating pumps.
A hydronic circulating pump moves heated or chilled water from the heat pump or boiler through every radiator, underfloor loop and fan coil, and modern ECM models use up to 80% less electricity than old fixed-speed pumps by adjusting their speed to demand. The right pump is sized to the system's flow rate and head loss, not the pipe size. AHHAC supplies and installs Grundfos and Wiseliving circulators and stocks common Grundfos replacements for fast service.
Reviewed by the AHHAC Technical Team — licensed plumbers & hydronic engineers, NSW Lic 262528C.How we write & review
The circulating pump moves water from the boiler or heat pump through every radiator, underfloor loop and fan coil in the system. Modern high-efficiency ECM (electronically commutated motor) pumps modulate their speed to demand, using up to 80% less electricity than the old fixed-speed pumps — a meaningful saving on a component that may run thousands of hours a year.
AHHAC supplies and installs Grundfos pumps — the global benchmark for hydronic circulators — alongside the Wiseliving pump range. We size every pump to the system's flow rate and head loss, because an oversized pump wastes energy and creates noise, while an undersized one starves distant loops.
Get the pump right and the system is silent, balanced and cheap to run. Modern ECM pumps (Grundfos Alpha, Magna series) self-regulate to maintain constant pressure or proportional pressure as zone valves open and close — no manual balancing drift over time. AHHAC commissions every pump to the correct curve and head, and we stock common Grundfos replacements for fast service.
The hydronic circulating pump is the one moving part in most hydronic systems, so it gets blamed for everything. Sometimes rightly. Often the pump is the symptom and the cause is somewhere else. These are the patterns we look for on a service call.
Usually, yes. Swapping a working fixed-speed circulator for a variable-speed ECM unit is one of the cheapest efficiency upgrades on an older hydronic system. It can use up to 80% less electricity, runs quieter, and adjusts itself as zone valves open and close. We size the replacement to the system's actual flow and head rather than copying the old pump's label, because many older pumps were oversized to begin with.
Before fitting a new pump to an older system, we check the water and recommend our central hydronic heating flushing service if sludge is present, followed by an inhibitor from our hydronic water treatment range. If pressure keeps dropping, the expansion vessel is the next thing we check.
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.
We only specify equipment after a heat-loss and system-compatibility check, then supply, install and commission it with our own licensed plumbers to AS/NZS 3500 (plumbing) and AS/NZS 5601 (gas), register the manufacturer warranty and service it for the life of the system.
"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."