"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."

Hydronic wood stoves and pellet burners with back-boiler integration — warm one room visually AND drive whole-home hydronic heating. Off-grid friendly, increasingly popular for rural Australian builds, architectural homes and Blue Mountains lifestyle properties.
A hydronic wood stove or pellet burner has a back-boiler that heats water while the fire warms the room, then circulates that water to radiators, underfloor or skirting heating throughout the house. Units typically produce 6–25 kW at 70–92% efficiency, and pellet models auto-feed from a hopper for hands-off operation. AHHAC designs and installs hydronic wood and pellet systems, often with a thermal store, in Sydney, the Blue Mountains and rural areas across NSW, VIC, QLD & ACT.
Reviewed by the AHHAC Technical Team — licensed plumbers & hydronic engineers, NSW Lic 262528C.How we write & review

A wood or pellet burner doesn't have to just heat one room. Modern hydronic burner units use a back-boiler to heat water, which then circulates through your hydronic network — feeding underfloor, radiators or whatever emitters you've specified.
It's the perfect solution for rural builds, off-grid cabins, or anyone who wants the romance of a real fire combined with the practicality of whole-home heating.
Manual log burners require you to feed and stoke the fire — a satisfying ritual for some, a chore for others. They produce 6–12 kW typically, with 60–75% net efficiency.
Pellet boilers are fully automatic — the pellet hopper auger-feeds the burner on thermostat demand. Higher up-front cost but you get gas-boiler convenience with biomass economics.
We enjoy designing hydronic wood stove systems, but this is the one heat source where lifestyle matters as much as engineering. Before we quote, we talk through how the household actually lives, because in the wrong home a wood-fired system becomes an expensive ornament.
It suits acreage, the Blue Mountains and rural properties with a reliable supply of seasoned hardwood or pellets and dry, covered space to store a season's fuel. It suits households where someone is home on winter days to load logs, or owners who choose a pellet model with an automatic hopper. And it suits people who value resilience: a fire that keeps heating the house when other supplies are unreliable.
Think twice if the house is empty from eight until six on weekdays and you want warmth on arrival, because a log fire cannot light itself. The same goes for small, very well-insulated homes, where even a modest firebox makes more heat than the house can use, and for tight inner-city lots where smoke, neighbours and fuel deliveries make solid fuel impractical.
See our hydronic heating in the Blue Mountains page, the hydronic wood heater range and our thermal stores and tanks.
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 design hydronic wood stove & pellet burner heating from a room-by-room heat-loss calculation, install it with our own licensed plumbers to AS/NZS 3500 (plumbing) and AS/NZS 5601 (gas), commission and document it, and service it for the life of the system. Nothing is subcontracted out.
Yes — a hydronic wood burner with a back-boiler captures heat from the firebox and circulates it through your hydronic network to radiators, underfloor or skirting heating throughout the house. Output range is typically 6–25 kW depending on the unit.
Logs need manual loading (a satisfying ritual for some, a chore for others); pellets auto-feed from a hopper for boiler-like convenience. Pellet boilers cost more up-front but run more like gas with biomass economics. Both work brilliantly in rural and off-grid builds.
Modern hydronic wood/pellet units run at 70–92% efficiency and burn renewable biomass — significantly lower lifecycle carbon than gas. Compliant units are emissions- and efficiency-tested to AS/NZS 4013 and AS/NZS 4012, and installed to AS/NZS 2918.
"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."