On Wed, 11 Nov 2015 04:31:00 -0800 (PST), trader_4
wrote:

On Tuesday, November 10, 2015 at 10:37:11 PM UTC-5, wrote:
On Wed, 11 Nov 2015 02:44:01 +0000, Gerry
wrote:

replying to Mark, Gerry wrote:
mark.kempe wrote:

I have an insulated garage that I want to heat, but just above
freezing. All the heaters I have will keep the temperature at 14C
(57F) or higher, which I don't want. I just want it slightly above 0C
(32F) to avoid the objects in the garage from freezing.
Does anyone know of such a heater? I can't seem to find one.
Thanks!




I live in Canada where it would be usual to have this application. The
garage that I want to heat to just above freezing is attached to the
house, well insulated so a heater with a thermostat that can be set from
about 0 degrees C to 10 degrees C or more would fit the bill. My question
is - why do manufacturers not provide this option, and why can I not find
ANY heater that gives the minimum and maximum temperature setting of the
thermostat on the box?
It's called a thermocube thermostat. It turns on the heater at 35F
and turns it off at 45F. It is available from Home Despot in the USA.

It is apparently a Canadian invention .
Contact Christy Fabros
Public Relations Specialist
Nuheat Industries Ltd.
604.529.4391
for information on where to buy one close to you.

HD sells the plug-in thermocube. Before relying on one, I'd suggest
reading online reviews. When I looked into them, I saw a lot of people
saying they were unreliable, would work for a few months, then when it
should go on, didn't and stuff froze.

I agree with the poster that you would think there would be more
quality choices available for that kind of thing, but I couldn't
find any other choices either when I was looking.

I've used those Thermocubes for livestock tank heaters, to prevent them
from staying on when the air temperature rises above freezing. They are
not very reliable. I wont buy them again.

They do sell thermostatically controlled fan switches, made for large
barn fans, which are intended to turn on the fan when the barn temp
rises above a set temp, such as 70deg. They are 120V switches. But I
dont think they go down to freezing temps. I believe they make similar
things for heating controls. Check out www.grainger.com
They sell a lot of that type of thing.

The OP could make a control if they are handy. Mount a relay in a
suitable electrical box. The relay contacts must be at least 15A. (20A
is better). Put a plug on cord and an outlet on this box. The plug goes
to a wall outlet, the outlet feeds the heater. Then mount a 24V
transformer on the box, and run wires to a plain thermostat (not
programmable). The relay must have a 24V trigger coil, the wires from
the thermostat feed that relay trigger coil.

It's hard to explain without a wiring diagram, but it's a simple
circuit. A thermostat is really just a switch that is controlled by
temperature. It's just switching the relay to the ON position when the
temperature falls below a certain temp, such as 40deg. The relay
contacts are 120V and they turn the heater on and off.

I built something similar once, but in my case the relay turned my
furnace on and off, based on a sensor on a woodburner. When the
woodburner got above a certain temp, the furnace was turned off. The
reason for this was because both shared the same ductwork. If both the
furnace and woodburner fans ran at the same time, the big blower in the
furnace would overpower the small fan on the woodburner, and cause it to
self destruct. This relay insured that both blowers did not run at the
same time. Relays are very useful for lots of things.