Get your portable heater and kettle on standby.

Police refused to speculate on the cause despite reports a portable heater was responsible.

This can be in the form of a clear enclosed bin sitting over a hotpad, or even a portable heater pointed at the bin.

As she fell to the floor, she knocked a portable heater into a packing crate and started a blaze.

Portable heaters can be effective, but should be used sparingly.