About this calculator

EU rule of thumb: flue cross-section ≥ stove outlet, never less. 5 kW stove → 125 mm flue; 8 kW → 150 mm; 12 kW → 175 mm. Sweeping costs £55–£90 in the UK, €50–€80 in mainland EU. HETAS recommends annual sweeping for wood-burners.

Frequently asked questions

What does the Chimney Flue Size & Sweep Cost Calculator do?

Recommended flue diameter for a stove and typical sweep cost. EU rule of thumb: flue cross-section ≥ stove outlet, never less. 5 kW stove → 125 mm flue; 8 kW → 150 mm; 12 kW → 175 mm. Sweeping costs £55–£90 in the UK, €50–€80 in mainland EU. HETAS recommends annual sweeping for wood-burners.

Is the Chimney Flue Size & Sweep Cost Calculator free to use?

Yes. Every calculator on Calcurly.com is free, works in your browser without sign-up, and can be embedded on your own website.

How accurate is the Chimney Flue Size & Sweep Cost Calculator?

Results are calculated in real time using industry-standard formulas. Treat the output as a well-informed estimate — always cross-check with local regulations, product datasheets, or a qualified chimney & flue professional before committing to a purchase or a job.

What inputs does the Chimney Flue Size & Sweep Cost Calculator need?

Enter values for: Stove output (kW), Sweeps per year, Sweep fee. Sensible defaults are pre-filled where possible so you can start with a single change.

Can I embed the Chimney Flue Size & Sweep Cost Calculator on my own website?

Yes — copy the iframe snippet at the bottom of this page, or use the Embed Generator to customise the size. The embedded version stays in sync with the live calculator on Calcurly.com.