alternative of electric heater due to beeing small

[evangelium]

Hi last cook i had a problem with the heater cause i have 20l reaction flask and cause it i have pretty large conteiner for oil bath witch is 50cm in diameter and in my country there arent any bigger heaters than 28cm in diameter so im thinking what should i get if i need to heat oil bath up to 280°-300°.
I thought about big camping cooker but its open fire and im afraid of explosion if any phoshene gas would get down on the ground
So anybody have some idea how to heat it properly ?

 

[Osmosis Vanderwaal]

A PID controller to a relay to as many heating elements as you want/ your electric service can handle. In the US that is usually *120volts x 15 amps) 1800 watts on 120 volts or 3600 watts on 240. You'll need a PID control and a thermometer, probably get both for $50 US, and the relay and heating elements the sky is the limit, but 2500 watts probably $200 or less