Candle tunnelling happens when a candle burns straight down the centre, leaving wax around the edges of the jar. It’s one of the most common candle issues and usually starts during the first burn.

What causes candle tunnelling?

When a candle is lit for the first time, the wax needs to melt fully across the surface. If it’s blown out too soon, only the centre melts. The candle then continues to burn in that pattern, creating a tunnel.

Other causes include:

• Short burn times

• Draughts or uneven airflow

• An untrimmed wick

• Burning the candle in a very cold room

Why the first burn matters

The first burn sets the pattern for the rest of the candle. Let the wax melt all the way to the edges before extinguishing the flame. Depending on the size of the candle, this can take one to three hours.

How to fix tunnelling

If your candle has started tunnelling, let it burn for longer than usual so the outer wax has time to catch up.

For deeper tunnels, wrap a loose layer of foil around the top of the jar, leaving an opening for the flame. This traps heat and helps melt the wax around the edges more evenly. Remove the foil once the surface has levelled out.

How to prevent it

• Allow a full melt pool on the first burn

• Trim the wick before lighting

• Keep candles away from draughts

• Avoid burning for very short periods

Refillable candles and tunnelling

Each refill gives you a fresh start, so good burn habits from the beginning make a big difference. Our candle refills are designed to fit their jars properly and burn evenly when cared for correctly.

Final thoughts

Tunnelling is common and usually easy to avoid. A proper first burn and a little regular care will help your candle burn more evenly and last longer.