A new low cost, easy to install method to more precisely limit the upper temperature of the Vegtherm 12V inline SVO/biodiesel heater at low flow rates. Our genuine Vegtherm (TM) has always had an inherent upper temperature limit that is fail-safe and more reliable than thermostats.
However, at very low flow rates (for example, those fuel efficient smaller cars sitting idling in traffic on a summer day!) temperatures can creep up beyond what is desirable.
If the Vegtherm's wattage were reduced, and it's elements made more sensitive, it would simply not heat as well as it should for the majority of the operating conditions where it is needed, namely the higher flow rates of an engine that is doing some "work" (moving a car, pulling a load, running a generator, etc.)
For those who feel they want more precise control and lower upper-limit temperatures in low flow rate applications we offer this very simple, reliable, low cost device.
Simply clamp the Vegsensor to the Vegtherm tube itself, or near it along the outlet line, and it will turn the Vegtherm on and off automatically, no fuss, no bother.
The sensor is made to respond to a temperature of 110C/230F. For most applications, mounting it as shown, at the end of the Vegtherm tube, corresponds nicely to the usual target SVO temperature in the area of 70C/168F at the injectors.
Vegsensor for Vegoil 
A new low cost, easy to install method to more precisely limit the upper temperature of the Vegtherm 12V inline SVO/biodiesel heater at low flow rates. Our genuine Vegtherm (TM) has always had an inherent upper temperature limit that is fail-safe and more reliable than thermostats.