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Old 11-07-2011, 08:19 PM   #1
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15amp Themostat /Block Heater

I recently installed a 1000watt block heater in my '96 3126 Cat engine.
I also have a TC-3 Themocube, which is rated for up to 1500 watt space heaters.
The TC-3 is designed to go on when the air temp drops to 35 degrees F, and to shut off the power if it reaches 45 degrees.
I figure I will plug the block heater in through the Thermocube the night before a planned drive.
If the outside temp gets down to 35 the engine will be warmed, if not, no power will be wasted.
Does that make sense?
Should I also use an appliance timer, (or just a timer alone?
Has anyone used a thermosat for their block heater?

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Old 11-07-2011, 08:31 PM   #2
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I'm going to move your question down to the Cat. engine forum may get a better response there.

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Old 11-07-2011, 08:33 PM   #3
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If temps are forecasted to be that cool, and i was planning to start my diesel, I would simply plug it in for the evening.
1997 Rexhall RA3400, 8.3 Cummins
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Old 11-08-2011, 08:09 AM   #4
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First: Unless you plan on driving in the AM, i'd not use the block heater at all.. Use a timer to turn it on say 4 hours before you drive (you will fine tune that over time)

Use of the thermo-cube (I use those on my tank heaters) also good idea, it gets AFTER the timer.

Recommendation.. if there is not a properly wired outlet in the engine compartment already, Use 12 ga wire and bend the wire UNDER A SCREW don't poke it in a hole at both ends. Dedicated 15 amp breaker, and use a 15/20 amp outlet in the engine compartment That's the kind where one slot (neutral) is a "T" shape.

1,000 watts is pushing it for standard RV wiring (14 ga poked in the hole)
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