Subject: Re: OT: Intro + Q:Selecting workshop heater

> Date: Tue, 19 Dec 2000 09:52:14 -0800
> From: "Marcus & Eva" <implmex@...>
>
>Hi Marco:
> Go with electric.
>Insulate the garage really well, and a little oil filled radiator type
>heater will keep it warm and dry.
>I always worry about unattended flames in a shop with paint thinner,

varsol,

>acetone etc around.
>I also worry about carbon monoxide.

Electric heaters are an ignition source for ignitable vapors. The
thermostat contacts spark or arc when the open/close.

Don't leave the oil filled electric heaters unattended. They do not have
any secondary safety device. The only on/off device is the thermostat. The
contacts can weld closed, causing runaway operation. The oil overheats and
pressure builds until a spot weld fails. The spot welds rip open, allowing
a mist of hot oil to escape. The oil can be above its autoignition
temperature, or will otherwise find an ignition source. The result is a
very fast growing fire.

Ken
:-)