enblethen wrote:
Do you mean something like this?
Thermo cube
Yes.
Review from Home Depot site,
February 14, 2013
5.0
5 out of 5
Quality
5.0
5 out of 5
Value
3.0
3 out of 5
Recommended Product
I use the Thermocube for freeze protection in the plumbing bay of my RV. I have a small 1500 W heater connected to it. I can prevent freezing without running a heater constantly. On at 35 deg. and off at 45 deg. is perfect!
Pros: Easy to Use, Easy to Install, Good Size & Weight, Compact
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Terry.