I bought a plastic tank for heating oil storage at Seiyu. It cost 754 yen ($6.28 €5.13). It can contain 10L of heating oil. I also bought a pump which pump up heating oil from the plastic tank to our oil fan heater. The pump cost 99 yen ($0.83 €0.68).
My wife brought the tank to a gas station and bought heating oil. She brought back it to home.