Fire service issue stark warning after heat pack sparks blaze in Worthing

The pouch, which is filled with dried grains, went up in flames in the microwave

Microwave that caught fire in Worthing
Author: Isabella HudsonPublished 1st Feb 2026

Firefighters in West Sussex are issuing a warning following a blaze sparked by an overheated wheat bag in Worthing earlier this month.

On 14th January, fire crews were called to a house on Offington Lane after a careline system raised the alarm.

When they arrived, the house was full of smoke, and they acted quickly to extinguish the fire and ventilate the property.

According to the West Sussex Fire & Rescue Service, the fire was ignited by a microwavable wheat bag that had been overheated.

These items, although popular for warmth and comfort, can be dangerous if misused.

Neil Harrison, Prevention Manager at West Sussex Fire and Rescue Service, shared advice on how to use wheat bags safely, saying that the key is to follow all manufacturer instructions carefully, including heating times.

Harrison explained that it is important not to overheat wheat bags, and to check for wear and tear before using them.

If signs of scorching or damage are present, it is better to avoid using the item.

“When heating, add a cup of water in the microwave to prevent the organic material inside from drying out,” Harrison said.

He also recommended allowing the wheat bag to cool fully before reheating.

“If it’s in a microwave and catches fire, the safest choice is to leave the property and call 999,” Harrison added.

One lesser-known hazard is that overheated wheat bags can ignite up to three to four hours after heating.

Harrison emphasised this point, explaining that the material inside retains heat and can combust under certain conditions.

To prevent risk, fire crews advise against leaving wheat bags in beds or under blankets, where trapped heat can lead to ignition.

Crew Manager Stuart Williams highlighted that wheat bags should not be dismissed as harmless, stating, “As this incident proves, if they’re overheated, they can ignite. Always follow the heating times provided by the manufacturer."

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