Jasen Betts wrote:

On 2005-11-20, Neil wrote:

Can anyone recommend a thermostat that does not require a power supply and
can switch a 12v heater?

t
Thare exist mains rated bimetallic thermostats that can be used to
switch a relay to control your 12V load.

what is it you want to take the temperature of?

what is it you want to heat, and what is your heat source.


A regular household thermostat comes it two basic styles: 220 vac,
or 12 volt.

The 220 v stat cannot take a lot of current as required usually by
12v equipment, but they can still handle current sufficient to
operate a headlight relay or battery solenoid.

A 12 v stat ususally has a sealed explosin proof mercury switch, but
cannot handle a lot of current either, though it can operate the
same relay or solenoid.

Don't let the gas explosion hype terror mongers get to you, they
probably own diesel stocks. Put the relay in a closed fume proof
box, if it worries you.

What you gonna control?

Terry K