Brivis Gas Ducted Heater Replacement Parts: What You Need to Know
Written by Rica Francia Macaspac, HVAC Shop content writer, in consultation with Aussie HVAC tradies and industry experts. Published: June 2026 · Last reviewed: June 2026.
Brivis ducted gas heaters are built to last, and many units in Australian homes run for ten, fifteen, or even twenty years before they need serious attention. When a fault appears, the heater itself may still be serviceable. In many cases, one specific component has worn out, and replacing it correctly can restore the system without the cost and disruption of a full unit replacement. This guide covers the key replacement parts across the Brivis gas ducted heater range: what each component does, when replacement may be needed, and how to order the correct part. If you already know what you need, browse our full range of Brivis gas ducted heater parts and filter by component type.
Why Brivis Heater Parts Fail
Component failure on a Brivis ducted gas heater is usually a product of age, service cycles, environment, and maintenance history rather than poor build quality. The platform is well-engineered, but no mechanical, gas, or electronic component runs indefinitely. Thermocouples can degrade over thousands of heating cycles as their millivolt output drops. Pressure switches can suffer diaphragm fatigue or blocked sensing tubes over years of use. Gas valves can develop solenoid wear. Control boards are subject to the same capacitor and relay degradation that affects any PCB operating in a warm appliance environment.
Australian climate conditions add their own pressures. In coastal areas around Sydney, the Gold Coast, and the WA coast, salt-laden air can accelerate corrosion on terminal connections and electrical components. In dusty inland environments, particularly in rural Queensland and regional New South Wales, fine particulate buildup can affect combustion components and pilot assemblies. In Melbourne and Canberra, first-of-season cold starts can expose faults in ignition, airflow, and safety components that have been idle through milder months. Understanding these factors helps prioritise which components to inspect first and why correctly matched replacement parts matter more than generic substitutes.
The single most important rule across Brivis replacement parts is exact matching. The Brivis range spans multiple model families and production generations, and components that appear physically identical can carry different specifications. A pressure switch with the wrong Pascal rating, a pressure switch with the wrong bracket length, a thermocouple that is too short, or a control board variant that differs by one integrated switch can each produce repeat faults or unsafe operation after installation. Match by BS part code first. Confirm gas type and variant-specific details second. Only then order.
Tradie Pro Tip: On first-of-season call-outs in Melbourne and Canberra, a qualified technician should check the combustion fan before condemning the pressure switch or control board. A fan that has sat idle through spring and summer can become stiff or sluggish enough to prevent the pressure switch from proving airflow. With power isolated, the technician can check fan movement and confirm whether the issue is the fan, the switch, the tubing, or the board.
Gas Valve Replacement Guide
The gas valve controls the flow of gas from the supply line to the burner. On many Brivis ducted gas heaters, the primary valve platform is the White Rodgers 24V solenoid type, which is activated by the control board once all safety circuit conditions have been satisfied. When the valve operates correctly, gas flows to the main burner, the burner lights from the pilot, and the heating cycle runs. When the valve fails, gas flow to the burner may stop regardless of what the rest of the system is doing.
Gas valve failure can present as no main burner flame despite a functioning pilot and a clean ignition circuit. The pilot lights, the thermocouple confirms flame, the control board signals the valve to open, and the burner still does not fire. In some cases, a partially failing valve produces intermittent gas flow, causing erratic heating cycles where the unit fires correctly on some calls for heat but fails on others. This intermittent behaviour can be mistaken for a control board fault, so the valve should be tested properly before moving on to the PCB.
The White Rodgers 24V valve is a common replacement across Brivis, Braemar, Bonaire, and Buffalo platform heaters where the original BS code and gas type match. The 24V gas control valve (W0085) is stocked for common applications across this platform. Gas type matters here as it does across all gas-contact components. Confirm whether the unit runs on natural gas (NG) or LPG from the data plate before ordering. Gas valve installation must be carried out by a licensed gas fitter in accordance with AS/NZS 5601.1.
Burner and Combustion Components
The burner is the component where gas combustion takes place. On Brivis ducted gas heaters, the primary burner component is the zip tube, a rolled metal burner body that channels and distributes the gas flame within the heat exchanger. Zip tube failure or damage can result in incomplete combustion, uneven flame distribution, or visible cracking or burn-through of the burner body. These faults can affect heating performance and may create combustion issues that require professional assessment.
Zip tubes are rated by MJ (megajoule) input capacity, which corresponds to the heating input of the specific heater model. The MJ rating of the replacement must match the original burner and the heater data plate. Fitting a burner with the wrong MJ rating can affect combustion performance and may create an unsafe operating condition. The correct MJ rating is identified from the data plate input rating and the BS code on the original burner component.
Three zip tube variants cover many Brivis heater installations. The small variant suits units in the 15 to 52MJ input range. The medium variant covers the 85 to 92MJ range, which is common across residential Brivis Networker, NetworkPlus, and Star family heaters. The large variant suits 120MJ units found in larger homes and some light commercial applications. For large Brivis heaters, order the 120MJ burner zip tube (BS80021047). For mid-range residential models in the 85 to 92MJ bracket, the 85MJ burner zip tube (BS80021046) is the correct replacement. Burner replacement involves gas combustion components and must be performed by a licensed gas fitter.
Did You Know? Zip tube burnout on Brivis heaters can be a secondary problem rather than the original fault. Incorrect gas pressure, valve issues, restricted airflow, or extended operating cycles can damage a burner that would otherwise have continued operating normally. If a zip tube is being replaced, a licensed gas fitter should confirm gas pressure, combustion performance, and valve operation before commissioning the replacement.
Pressure Switches
The pressure switch is a safety device positioned in the combustion airflow circuit. Before the gas valve opens, the control board must receive a signal from the pressure switch confirming that the combustion fan is drawing air through the heat exchanger at the correct rate. This prevents gas from flowing when combustion airflow has not been proven, which helps protect against unsafe ignition and combustion conditions.
Pressure switches are rated in Pascals (Pa), and the Pa rating defines the specific pressure differential at which the switch trips. This rating is determined by the combustion fan and heat exchanger design of each specific model. Brivis heaters across the range use switches rated at 50, 80, 115, 140, and 165Pa. The Pa rating of the replacement switch must match the original exactly. A switch with the wrong Pa rating can prevent the heater from operating or allow it to operate when airflow conditions are not correct.
The Pa rating is printed on the label of the original switch. Read it directly from the switch body before ordering. For Brivis pressure switches, the Pa rating and bracket length must both match the original exactly. Do not order by appearance alone, as switches with the same shape can have different pressure ratings, bracket lengths, tubing port positions, or mounting geometry. For Brivis models fitted with the 140Pa switch, the Brivis pressure switch 140Pa (BS80021375) is the correct replacement. Do not substitute a different Pa-rated switch even if another variant is more readily available. Although pressure switch replacement does not disconnect a gas line directly, it is part of the combustion safety sequence and should be carried out by a licensed gas fitter or qualified HVAC technician.
| Component | Function | Key Selection Criteria | Common Failure Symptom | Who Should Install It |
|---|---|---|---|---|
| Gas Valve | Controls gas flow from supply line to burner | Gas type (NG or LPG), BS code | No main burner flame despite good pilot and ignition circuit | Licensed gas fitter required |
| Burner Zip Tube | Channels and distributes gas flame in heat exchanger | MJ input rating, BS code | Incomplete combustion, uneven flame, visible damage to burner body | Licensed gas fitter required |
| Pressure Switch | Confirms combustion airflow before gas valve opens | Pa rating and bracket length must match the original exactly | Heater locks out with fan running but ignition never starts | Licensed gas fitter or qualified HVAC technician |
| Thermocouple | Generates millivolt signal to hold gas valve open | Length (18 or 24 inch), termination type | Pilot lights then goes out within 5 to 30 seconds | Licensed gas fitter required |
| Control Board (N-E6) | Manages the ignition and heating sequence | Variant: with or without integrated switch | Random lockouts, no ignition despite good external components | Qualified HVAC technician, with gas fitter for commissioning where required |
| Transformer | Steps 240V mains down to 24V for control circuit | Amperage (1.75A or 2.25A) | Completely unresponsive unit, no display or controller activity | Licensed electrician required |
| Pilot Lead Assembly | Lights main burner via pilot flame and ignition electrode | Gas type (NG or LPG), BS code | Clicking with no flame at all | Licensed gas fitter required |
Cross-Brand Compatibility: Braemar and Bonaire
One practical advantage of the Brivis platform is that some components are shared across Brivis, Braemar, Bonaire, and Buffalo ducted gas heater families. Platform parts such as selected White Rodgers gas valves, N-E6 control board variants, and pressure switches can cross over between brands when the original BS code and specifications match. For technicians regularly servicing across brands, this can reduce the number of part lines needed to carry on the van.
Cross-brand compatibility does not mean universal interchangeability. Heat exchangers, wiring looms, brackets, and generation-specific components can differ between brands even when the units appear similar. The correct approach is always verify by BS part number before ordering rather than assuming compatibility from the brand name alone. If the BS code on the original component matches the BS code on the replacement part listing, and the gas type or variant details also match, the part is the right one to order. If you are working on a Braemar unit and need a cross-reference, our range of Braemar spare parts lists platform components with Braemar-specific model cross-references where relevant.
For gas-type components specifically, cross-brand compatibility does not override the gas type requirement. A White Rodgers gas valve that suits both Brivis and Braemar platforms may still have NG and LPG variants. Confirm gas type from the data plate of the specific unit you are working on before ordering any gas-contact component, regardless of whether it is a Brivis, Braemar, Bonaire, or Buffalo unit.
Tradie Pro Tip: When working on a Braemar or Bonaire unit and ordering from a Brivis parts listing, always confirm the BS code matches. Do not order based on the product description alone. Two listings that both say "pressure switch" with the same Pa rating can differ in bracket length, bracket configuration, or tubing port orientation, and the wrong one may not mount correctly even if the electrical specification looks identical.
Sourcing Genuine Replacement Parts
For safety-critical components across the Brivis gas ducted heater range, genuine parts are the right choice. Gas valves, pilot assemblies, burners, and pressure switches are components where specification accuracy directly affects safety and compliance under AS/NZS 5601.1. A genuine part carries the correct BS code, is manufactured to the original specification, and is traceable through the supply chain. A compatible aftermarket part may function correctly in some applications, but for gas-circuit and combustion safety components, the risk of a specification mismatch is not worth taking lightly.
For electronic components such as control boards and transformers, the specification matching requirement is just as important. A control board with the wrong variant, or a transformer with the wrong amperage, can cause repeat faults or damage downstream components. Order by BS code and confirm all variant details before purchasing.
All parts should be installed by appropriately licensed tradespeople. Gas components require a licensed gas fitter under AS/NZS 5601.1. Electrical components require a licensed electrician or qualified HVAC technician. For current electrical or gas licensing requirements, check the regulator in your state or territory before carrying out any work involving gas components, wiring, mains power, or commissioning. For a full breakdown of every component category across the Brivis range, including identification guides and variant selection details, the complete Brivis spare parts guide covers everything in one place.