As the chilly season rolls in, there’s nothing quite like the warmth and crackle of a wood-burning heater. But behind every efficient and safe firewood heater lies an unsung hero — the flue system. Whether you’re upgrading your fireplace or installing a new wood heater, choosing the right firewood heater flue is essential for performance, safety, and compliance.
In this guide from Stainless Flue AU, we’ll break down everything you need to know about firewood heater flues — from how they work to the different types, materials, safety standards, and installation tips.
What Is a Firewood Heater Flue?
A firewood heater flue is the pipe system that vents smoke, gases, and particles from your wood heater to the outside atmosphere. It’s a vital part of your heating setup that:
- Ensures safe ventilation
- Prevents smoke from entering your home
- Enhances combustion by drawing fresh air
- Reduces creosote buildup (which can cause chimney fires)
Think of the flue as the “lungs” of your wood heater — it helps your heater breathe and function properly.
Why a Quality Flue System Matters
Safety First
Poor flue systems can lead to dangerous smoke spillage or even carbon monoxide leaks.
Better Heat Output
A proper draft allows your heater to burn more efficiently, providing better warmth and longer-lasting fires.
Compliance with Australian Standards
To legally install a wood heater in Australia, your flue must comply with AS/NZS 2918 regulations.
Long-Term Durability
High-quality materials like stainless steel ensure your flue withstands extreme heat, moisture, and time.
Types of Firewood Heater Flues
There are two main types of flues used in wood heating systems:
Single-Skin Flue
- Made from a single layer of stainless steel or galvanized metal
- Typically used inside the room
- Requires clearance from combustible materials
- Low cost but less insulated
Double-Skin or Triple-Skin Insulated Flue
- Consists of two or three layers with insulation in between
- Used for penetrating ceilings and roofs
- Maintains high internal temperatures and cool outer wall
- Essential for safety and energy efficiency
Components of a Flue System
A complete firewood heater flue system from Stainless Flue AU includes:
- Inner flue (single-skin or double-skin)
- Outer flue with insulation
- Ceiling plate and spacer
- Roof flashing and storm collar
- Cowl (or chimney cap)
- Brackets and stabilisers
These work together to ensure a safe, sealed, and efficient exhaust path.
Stainless Steel – The Gold Standard
At Stainless Flue AU, we use 304 and 316 stainless steel because it provides:
- Superior corrosion resistance
- Extreme temperature durability
- Sleek, modern appearance
- Minimal maintenance needs
Our flues are precision-engineered and tested to meet Australian building codes and AS/NZS 2918 standards.
Choosing the Right Flue Size and Length
Getting the dimensions right is crucial. Here’s what to consider:
Diameter
- Standard sizes range from 6 inches (150mm) to 8 inches (200mm).
- Match the flue diameter to your heater’s flue collar for optimal airflow.
Length
- The flue must extend at least 1 meter above the roof and be higher than any structure within 3 meters to ensure a good draft.
Still unsure? Contact our support team, and we’ll help you choose the perfect size.
Installation: Through Wall or Through Roof?
Through Roof
- Most common setup
- Requires triple-skin flue once it passes through the ceiling
- Needs roof flashing and cowl for waterproofing
Through Wall (Rear Venting)
- Often used for aesthetic or structural reasons
- Requires bends and horizontal sections
- Must comply with clearance and draft regulations
We provide complete installation kits for both setups.
Safety and Compliance
Installing a firewood heater and flue system is subject to local building codes and must:
- Follow minimum clearance requirements
- Use insulated flues for any ceiling or roof penetration
- Be installed by a qualified professional (in many cases)
All Stainless Flue AU products are tested and compliant with AS/NZS 2918.
DIY or Professional Installation?
DIY Installation (Only for Experienced Users)
- Suitable for outdoor or single-storey setups
- Must strictly follow manufacturer guidelines and council regulations
- Professional Installation
- Required for indoor installations or multi-storey homes
- Ensures full compliance and safety
- May be needed for insurance purposes
The Role of a Chimney Cowl
A chimney cowl is the finishing touch that sits on top of the flue. It:
- Prevents rain and debris from entering
- Stops birds from nesting
- Enhances airflow and draft
- Reduces backflow during windy weather
We stock a variety of cowls — including anti-downdraft, rotating, and spark arrestor models.
Why Choose Stainless Flue AU?
Here’s why customers all over Australia trust us:
- 💎 Premium 304 & 316 Stainless Steel
- 🇦🇺 Australian-made and compliant
- 🧩 Modular kits for easy installation
- 📦 Fast nationwide shipping
- 🛠️ DIY and trade support
- 📞 Expert customer service
- 🔒 5+ Year Product Warranty
Buy Your Firewood Heater Flue Online
We make it easy to shop online. Visit our website and:
- Choose your heater model or flue diameter
- Select a full kit or individual components
- Customize your height and parts
- Place your order for fast Australia-wide delivery
Need help? Call our team or use the live chat!
Firewood Heater Flue Kits Available
We offer complete flue kits designed for:
- Indoor wood heaters
- Outdoor pizza ovens
- Fireplace replacements
- Custom builds and renovations
Every kit includes everything you need — from pipes and cowls to flashings and brackets.
Eco-Friendly and Sustainable Heating
Wood heating, when paired with efficient flue systems, offers a sustainable, carbon-neutral heating option. Using seasoned hardwoods and maintaining your flue helps reduce smoke and emissions.
Regular flue cleaning also ensures cleaner air inside and out.
Conclusion
A high-quality flue system is the backbone of any reliable firewood heater. It affects everything from heat performance and safety to longevity and local compliance. Whether you’re installing a new system or replacing an old one, investing in stainless steel flues from Stainless Flue AU ensures peace of mind, warmth, and years of safe, efficient heating.
FAQs About Firewood Heater Flues
Q1. How often should I clean my firewood heater flue?
Ideally, once a year—more often if you use the heater daily during winter.
Q2. What’s the best flue material?
Stainless steel (304 or 316 grade) is the best for durability and safety.
Q3. Can I install the flue myself?
You can for simple outdoor or single-storey setups, but indoor installations should be done professionally.
Q4. Are your flue kits compliant with Australian standards?
Yes, all kits are AS/NZS 2918 certified and meet all local safety regulations.
Q5. What’s included in a full flue kit?
Inner and outer flue pipes, ceiling rings, roof flashing, chimney cowl, spacers, and mounting brackets.
