I think people don’t understand how difficult the fluctuations can be. Most people I know with oil heating save during summer in order to buy at least their first tank of oil in early autumn, when the prices are typically lower.
I’ve just found my receipt from late June 2025 ( a bit earlier than usual), and I paid 52.75p per litre ( plus of course VAT at 5%).
Today heating oil via your NRG, who are normally fairly competitive, costs is a minimum of 112p.
The difference between £277.49 and £586.69 is really significant.
Some of us were lucky enough to have saved earlier in the year, and I was able to take advantage of an exceptional dip in prices and got some for 65.6p per litre several weeks ago. It was a temporary drop, which lasted a matter of days before climbing again.
Many people aren’t able to do this and can’t buy oil until they have saved enough for the minimum delivery.
It is, and always has been, possible to buy smaller quantities but the price per litre jumps so drastically it’s rarely worth it.
I don’t think the OP should be taking out loans. If she can’t afford a lump sum payment for heating oil now then how will she do so in future with an even lower net income once she takes off loan repayments?
Electric heating is very efficient for heating one room, albeit expensive.
A smart meter would be helpful to monitor usage.