Product Details
Variable Temperature Controller
Makes installation fast and easy!
The 707 Variable Temperature Controller can be used with any 700 Series SAFE-HEET Engine Heater as an installation aid or for providing temperature control for continuous preheat without promoting internal engine corrosion.
As an installation aid for the SAFE-HEET engine heater, the temperature controller allows the heater to quickly cure the installation adhesive, using its own heat energy at a reduced rate. The increased temperature also thins the adhesive, which aids in eliminating micro bubbles and provides better heat transfer. The SAFE-HEET engine heaters can be installed in much colder temperatures using the Variable Temperature Controller.
Allows continuous heating - Always be ready to fly!
- Reduce the temperature to leave your SAFE-HEET plugged in continuously!
- Can be used with other electric heaters
- Available separately or with a SAFE-HEET Kit: P/N 700KT, 705KT or 720KT
The Variable Temperature Controller can also be used for extended periods by setting the indicator in the blue or red range. These lower temperature settings help prevent the internal engine corrosion normally associated with leaving heaters on at full power. The Variable Temperature Controller allows the user to determine what setting best fits each unique situation. For example, if subzero weather is forecasted and a flight is anticipated in the next couple of days or a week the controller can be set at about 50-75% brightness of the indicator light. The reduced setting will maintain the engine temperatures just above freezing. This engine temperature will not promote internal engine corrosion but will allow quick preheat when the aircraft is needed. For completion of the preheat, the controller can be turned to full power for a short time just before starting the engine.
The Variable Temperature Controller cord is 25 ft long. Temperature range at the top of the blue arc is 125-150 degrees Fahrenheit.
AeroShell Oil and Tempest Oil Filters also available.
Eligible Aircraft
| Make |
Series |
Model |
Beginning S/N |
Ending S/N |
Eligibility Chart |
| Many |
Many |
Many |
0 |
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Related Documents
Safety Data Sheets (SDS)
Product Catalogs and Price Lists
Non-Reference Documents
Maintenance and Product Guides
Installation, Use, and Maintenance Instructions
Eligibility Charts
Approvals, Certifications, and Qualifications
Frequently Asked Questions
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Why should I buy the McFarlane brand?
McFarlane’s adhesive is thermally conductive, so it transfers heat effectively while the other brands use a peel and stick tape that tends to fall off. As a result, McFarlane’s has a longer life over the other brands. McFarlane’s adhesive is resistant to solvents/oils but if it ever does fail, the heat pad is not going to jam up anything in the engine compartment, because it is not a solid metal like other brands out there. SAFE-HEET heats the engine oil while other brands heat the cylinder, not the oil. SAFE-HEET is safe and is electrically grounded with a ground wire. The SAFE-HEET pad covers a large surface. McFarlane’s GFCI can be used with any heater, not just SAFE-HEET.
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What does the GFCI do?
The GFCI protects the SAFE-HEET and engine from any electrical fault situations by shutting off power to protect people and the engine. Abuse of the power cord can cause dangerous electrical failures.
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I don’t think enough adhesive was supplied with my SAFE-HEET. Can you send me more or can I use the silicone adhesive?
The amount of adhesive contained in each kit is enough to do one installation and offers better thermal heat transfer than using a larger quantity. The adhesive should be thin, if there is no adhesive 1/8” from the edge of the pad it will not be a problem because our adhesive is totally resistant to solvents or oils. Sealing the edges is not necessary. Using silicone adhesives will allow the heat pad to come loose because silicone is not resistant to solvents or oils. If you feel you need more adhesive, we will send you more at no charge upon request.
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Why should I purchase a complete kit?
The kit includes the SAFE-HEET and temperature controller. The temperature controller makes installation easier and helps control condensation which leads to corrosion. It is like a dimmer switch that puts you in control of how much power is going to the unit.
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How long should I let the adhesive cure?
Twenty hours at a temperature of 70 degrees. If using a temperature controller you can turn the thermostat to about 110 degrees and it will take about seven hours to cure
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Should I leave the heater plugged in all the time?
Yes, if the temperature is controlled to prevent condensation which can lead to corrosion.
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What does it cost to operate the SAFE-HEET?
It costs about 3 cents per hour to operate.
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Is there a SAFE-HEET designed to be used with 240 volts?
No, neither a SAFE-HEET nor Temperature Controller should be plugged into 240 volts. You can use a system with an adapter that reduces the voltage to 110 and can supply at least 3 amps.
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Can two SAFE-HEET engine heaters be connected to one temperature controller?
Yes, the 707 is rated at 600 watts. This is enough power to run two units by using a splitter.
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What are the watts of SAFE-HEET?
| P/N |
Dimensions |
Watts |
| 700 |
4 inch x 4 inch |
200 Watts |
| 705 |
7.5 inch x 3.5 inch (diamond) |
150 Watts |
| 720 |
7 inch x 4 inch |
300 Watts |
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My GFCI is not working.
Reference the troubleshooting instructions provided with the purchase of a SAFE-HEET. The GFCI will not work unless plugged directly into an outlet. Plug in the GFCI then the temperature controller. The GFCI needs to be the first thing plugged into the circuit. The GFCI needs full voltage to engage. It cannot have an extension cord plugged in the outlet, then the GFCI to the SAFE-HEET. The GFCI does reset itself every time it is unplugged. |
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Can I install SAFE-HEET on an induction box/Plenum?
On some aircraft (like the Lycoming IO-540 engines) the induction box covers up the oil pan where the SAFE-HEET would normally be installed. It is permissible for the SAFE-HEET to be installed on the induction box, because the box/plenum is a thick casting that can transfer heat effectively.
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Can I use temperature controller P/N 707 with a 220 Volt system?
No, you will need to use a converter that can supply 3 amps at 120 volts to operate both a SAFE-HEET and 707.
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What setting do I place the 707 controller to get my engine at a certain temperature?
This is determined by experimentation on knob settings and several variables such as ambient temperature, wind, size of engine/propeller combination and insulation of engine cowling.
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Do you have any advice for installing a SAFE-HEET?
SAFE-HEET engine heaters are installed with a two-part adhesive. The engine heater can be installed quickly and easily by using the 707 temperature controller at half power. At temperatures below 70°F the temperature controller must be used to ensure proper adhesive cure. Proper adhesive cure is essential to full service life of the heater. |
WARNING: Cancer and/or Reproductive Harm - www.P65warnings.ca.gov