On Sat, 18 Jan 2014 09:33:42 -0600, "RogerN" <
re...@midwest.net>
wrote:
Get a regular plug-in electric heater and a "plug-in" line
thermostat. Modify the calibration if necessary.
Another idea - use a contactor-relay to control the outlet you plug
the heater ijnto. Control the relay with one of the old round
honeywell mercury switch thermostats - calibrate the thermostat 10 or
20 degrees down by rotating the mounting. They are only accurate when
mounted level..
Third option - get a refrigerator thermostat and have it operate a NC
relay - reversing it's operation - it heats when the thermostat calls
for no cooling, and does not when the thermostat calls for cooling.
The plugin thermostat used to be a common item for "milk house
heaters" at farm supplies. Might even be able to get a "milk house
heater" with a thermostat that goes low enough. -
Or get a "block heater thermostat" - Here in Canada Canadian Tire
carries the Noma brand.
Or go to Home Despot and buy a "thermocube" - on at 35F, off at 45F.
Handles up to 1500 watts. I'd run it on a 750 or 1000 watt heater