On Dec 10, 10:46*am, Robert Neville wrote:
" wrote:
Looks like the low temp stops at 40F. Would be nice to have something like this
to go down to 30F for a freeze prevention application.

set heat to 50, if it gets down to 40 you have a problem, and some
time to respond.......

This is a little different. It's a backup solution for a buried well house. The
well house goes below the frost line, so the pipes should never freeze, but
occasionally it gets really cold and penetrates enough to freeze up. I could
just put a 60w lightbulb in there, but would like to have it on a thermostat so
it isn't running continuously. Probably just be easier to use heat tape.

The well house goes below the frost line, so the pipes should
never freeze, but occasionally it gets really cold and penetrates
enough to freeze up

Many of the web definitions, such as this one from the US Army Core of
Engineers, say something similar to this:

http://el.erdc.usace.army.mil/emrrp/.../glossary.html

frost line - The limit of penetration of soil by frost.

Doesn't that mean, by definition, that the well house isn't *really*
below the frost line?

Perhaps the published frost line, either now or when the well house
was installed, is/was incorrect.