Part Number: 709SK


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Product Details

The 709SK GFCI Service Kit is a safety upgrade for the SAFE-HEET line of engine heaters or any other silicone pad engine heater. The kit provides ground fault and surge protection and all appropriate placarding and instructions for compliance with McFarlane Service Bulletin SB-3.


The addition of one 709 Ground Fault Circuit Interrupter and surge protector in every SAFE-HEET now makes our engine heater the safest unit available. With ground fault and surge protection the chance of dangerous and undetected lightning and mechanical damage that could cause lethal electrical shocks or engine damage is eliminated. SAFE-HEET uses U.L. recognized components and a 100% thermal fused element. The element itself shuts down the flow of electricity if any point on the element overheats. SAFE-HEET is thermostat controlled to maintain oil sump temperature less than 160 deg F. There is no flame or hot air to burn paint or plastic parts. The risk of fire associated with cold starts is reduced. 


Features and Benefits:

  • Reduces electrical shock hazards in wet or damp environments
  • Helps protect your engine heater and engine against electrical surges and lightning damage
  • Detects electrical shorts or faults
  • Provides compliance with McFarlane Service Bulletin SB-3


709SK Kit Contents:

  • 1 each Ground Fault Circuit Interupter (GFCI)
  • 1 each Cord placard
  • 2 each Large cable ties
  • 2 each Small cable ties
  • Installation and use instructions 
  • McFarlane Service Bulletin SB-3


Eligible Aircraft

Make Series Model Beginning S/N Ending S/N Eligibility Chart
Many Many Many 1 999999999999999

Frequently Asked Questions

Why should I buy the McFarlane brand?
What does the GFCI do?
I don’t think enough adhesive was supplied with my SAFE-HEET. Can you send me more or can I use the silicone adhesive?
Why should I purchase a complete kit?
How long should I let the adhesive cure?
Should I leave the heater plugged in all the time?
What does it cost to operate the SAFE-HEET?
Is there a SAFE-HEET designed to be used with 240 volts?
Can two SAFE-HEET engine heaters be connected to one temperature controller?
What are the watts of SAFE-HEET?
My GFCI is not working.
Can I install SAFE-HEET on an induction box/Plenum?
Can I use temperature controller P/N 707 with a 220 Volt system?
What setting do I place the 707 controller to get my engine at a certain temperature?
Do you have any advice for installing a SAFE-HEET?

Kits That Include 709SK

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