Kent calls this his "flowglow" because it is a straight flow-through fuel heater that uses a glow plug to produce the heat. Since the glow plug is submerged in vegetable oil fuel, it is very efficient and will last a long time. WARNING: If you turn it on with no fuel in the heater and leave it on for a long period, you will burn out the glow plug. The unit must be firmly grounded to the car's chassis to complete the electrical circuit. Do not use rubber mounts. You must use the metal mounts supplied and make certain that what you are mounting it to has a good ground connection to the chassis. Watch the video below for a full description of what is and what is not included in this kit.
Product Details
The unit draws approximately 12 to 15 amps, so it will need a separate relay with a battery connection to power it properly. We provide that in our STC100 SVO conversion kit. The thermostat is normally closed (meaning the relay is activated to send power to the glow plug0. At 140 degrees F, it snaps open, cutting the power to the heater.
As of June, 2026, Kent will include the necessary switch and relay along with limited wiring and instructions. The included instructions will ONLY show to how the relay is wired to activate the glow plug through the thermostat.
IMPORTANT: Along with the heater, you should use an accessory electric pump to aid in delivering the veggie to the heating unit. If you purchase our fuel boost pump kit there is a place on the panel to add an extra switch and relay.
Related Products:
STC-100 Diesel Fuel to SVO Conversion Kit for Factory Tank Operation
STC100 SVO conversion.
1978 to 1995 Universal Diesel Performance Fuel Boost Pump Kit
This can be installed in your W116 W126 W201 W124 diesel in 60 to 90 minutes. You will use the video instructions for installing it in a W123 (included), then you will make location modifications to fit your specific chassis.
Diesel to SVO WVO Conversion Flow-Through Fuel Heater and Wiring Extras
It is difficult to find a good inline fuel heater for running vegetable oil in your old diesel. This is a lightly used VEGTHERM unit that was available years ago during the height of the veggie craze. The other electrical components are new.
W123 Dual Tank Diesel to Vegetable Oil Conversion - Assembled Kit Used
You can also use this as a "single tank conversion" by changing the hose routing, removing one valve, and not using the extra pump. Watch the video below. Kent will explain in detail how this is installed.
Electrical components are pre-wired.