Calculated, not guessed
Diameter, height, and draught are calculated according to the boiler manufacturer's specifications. This ensures your installation achieves the promised efficiency.
Our services
Flue pipe for pellet boiler
Need a new flue pipe for your pellet boiler? Pelletkachelzorg calculates and installs condensation-resistant flue pipes: twin-wall flues or a flexible stainless steel lining in your existing chimney, including T-piece with condensate drain, penetrations, and documentation for inspection and certification. Active in Limburg, Flemish Brabant, the Kempen, and Dutch Limburg.
- Route calculation according to appliance regulations and standards
- Condensation-resistant flues with correct diameter and draught
- Twin-wall flue pipe or stainless steel lining in existing chimney
- T-piece with condensate drain, inspection hatch, and neat penetrations
- Documentation for inspection, certificate, and fire insurance
- One partner for flue, boiler, maintenance, and repairs
Pellet boiler flue system: the foundation of a safe installation
The flue system of a pellet boiler must be condensation-resistant, perfectly sealed, and sized to exact specifications, otherwise even the best appliance will never achieve its full efficiency. Pellet boilers produce lower flue gas temperatures than conventional boilers. As a result, condensation forms more quickly in the chimney, making diameter, draught, and material choice crucial.
Pelletkachelzorg designs, installs, and renovates flue systems for pellet boilers and solid fuel central heating systems. We calculate the flue run in accordance with appliance specifications and standard regulations, ensuring your boiler runs safely, efficiently, and trouble-free.
A new or modified flue system is required in the following situations:
You are installing a new pellet boiler: the existing flue is rarely suitable for lower flue gas temperatures. We coordinate the flue route during the installation of your pellet boiler.
Poor draught, smoke odour, or blowback: symptoms of an incorrectly sized or leaking flue. Read our article on draught issues and their causes.
Condensation stains or rust formation: moisture remaining inside the flue damages metalwork and masonry, indicating a flue that is not condensation-resistant.
Failed inspection or service check: an outdated or unsafe flue must be replaced before you can receive a valid compliance certificate.
Renovating an old masonry chimney: using a flexible stainless steel liner, we make your existing chimney safe and suitable again.
"Nine out of ten pellet boiler problems I encounter do not start in the boiler, but in the flue system. Properly addressing the flue route first saves years of breakdowns and costly repairs."
Twin-wall insulated flue or stainless steel liner: which suits your home?
There are two common solutions. We install a twin-wall insulated flue when no usable chimney is available, either internally through floors and roofs or externally along the facade. The insulation keeps flue gases warm, improving draught and reducing condensation.
If your property has a sound masonry chimney, we insert a flexible stainless steel flue liner. This is often the fastest and most economical option: the original chimney remains in place while receiving a gas-tight, condensation-resistant internal liner tailored to the correct diameter.
How do we approach your flue system installation?
Step 1: inspection and measurement
Our technician examines the appliance, existing chimney or proposed flue route, wall/ceiling penetrations, and clearances from combustible materials. Photos sent in advance speed up this step significantly.
Step 2: route calculation and quotation
We calculate the required diameter, height, and draught according to the manufacturer's guidelines and relevant standards. You receive a clear quote covering materials, route, and condensation drainage, with no unexpected costs.
Step 3: flue installation
We install the twin-wall flue or stainless steel liner, including a T-piece with condensation trap, inspection hatch, roof or wall penetration, and proper bracket support. Everything is fully accessible for cleaning and meets all fire safety standards.
Step 4: testing and documentation
Following installation, we test draught and seal integrity, adjusting boiler combustion where necessary. You receive all required documentation for inspection, certification, and building insurance compliance.
How much does a pellet boiler flue system cost?
The cost depends on flue length, number of bends, wall or roof penetrations, and material choice. Here are realistic guide prices for a pellet boiler flue system in Belgium:
pellet boiler flue costs
Guide price
New twin-wall flue system, installed:
€1,000 to €3,000
Flexible stainless steel liner in existing chimney:
€800 to €1,800
Roof penetration including flashing:
€300 to €800
External wall penetration including finishing:
€250 to €600
T-piece with condensation trap and inspection hatch:
€150 to €400
All figures are guide prices excluding VAT and depend on your specific situation. You will receive an exact quote following initial inspection.
Regular maintenance keeps your flue system safe
Even a perfectly installed flue accumulates debris over time. Ash and soot deposits reduce draught, causing operational faults or fire risks. Annual cleaning is therefore an essential part of pellet boiler maintenance.
Unsure about the condition of an existing flue for a standard pellet stove? Our flue and chimney service inspects the entire run and provides advice on what can be retained or replaced.
Ready for a safe, correctly dimensioned flue system? Request a free quotation or advice and attach photos of your chimney or roof run.
Need a flue pipe for your pellet boiler?
Describe your situation and add photos of the chimney, boiler, or roof penetration. You will quickly receive a tailored quote.
Condensation-resistant material
Pellet boilers produce cooler flue gases and therefore condensation. We only install gas-tight, condensation-resistant flues with a condensate drain.
Cleanable and safe
Every flue system includes an inspection hatch and correct distances to combustible materials. Maintenance and cleaning remain simple and safe.
Frequently asked questions
Count on €800 to €1,800 for a flexible stainless steel liner in an existing chimney and €1,000 to €3,000 for a new twin-wall flue pipe, including installation. Roof or wall penetrations and a T-piece with condensate drain are additional. You will receive an exact quote after an inspection.
Often yes, but rarely without modification. A masonry chimney is usually too wide and not condensation-resistant. With a flexible stainless steel liner of the correct diameter, we make your existing chimney suitable, gas-tight, and safe.
Because pellet boilers produce lower flue gas temperatures, moisture from the flue gases condenses faster in the pipe. In an incorrect pipe, this moisture damages metal and masonry and disrupts the draught. A condensation-resistant pipe with a condensate drain solves this.
The correct diameter results from the boiler manufacturer's instructions and route calculations, usually between 80 and 130 millimetres. Too wide causes condensation and poor draught, too narrow causes resistance and faults. We calculate this exactly for your appliance and route.
An outlet above the roof is the standard and provides the best draught. A wall penetration is only possible if the appliance and local regulations permit it and the distance to windows, ventilation, and neighbors is sufficient. We inspect on-site to see what is legally and technically possible.
At least once a year, together with the mandatory maintenance of the pellet boiler. A clean flue keeps the draught optimal, prevents malfunctions and fire hazards, and is required for your certificate and fire insurance.
Service area
Flue pipes for pellet boilers installed and renovated in Limburg, Flemish Brabant, the Kempen, and Dutch Limburg.
Other services
Pellet Boiler Inspection and Certificate Guidance
We assist with preparation, maintenance documentation, and practical guidance for pellet boilers, flues, and solid fuel systems.
Pellet boiler installation
Upgrading to a new pellet boiler or solid fuel central heating? Pelletkachelzorg manages the entire pellet boiler installation process: heat load calculation, condensation resistant flue installation , connection to radiators or underfloor heating, buffer tank integration, and commissioning. Complete with inspection guidance and official certification. Active across Limburg, Flemish Brabant, the Kempen, and Dutch Limburg.
Pellet boiler servicing
Pellet boiler servicing involves checking combustion, flue gas extraction, safety mechanisms, cleaning, and tuning.
Flue pipe for pellet boiler
