Countries worldwide are recently interested in economic efficiency in line with protecting environmental protection. Generally, optimization of cetane number, expanding fuel sources, and producing clean fuels with less pollution at the development trend in diesel fuel. Faced with that situation, global energy security is one of the top goals worldwide that can be ensured by diversifying energy resources parallel with minimizing fossil energy dependence. Among solutions, biofuel in internal combustion engines is a potential approach that receives great attention from global researchers. Among biofuel sources, vegetable oil or animal fat can be employed directly on compression-ignition internal combustion engines. This study presents a method to design and manufacture a system that utilizes exhaust heat with integrated electrical energy to heat vegetable oil for direct use in diesel engines.