> Those who installed oil heaters many decades ago regretted it quickly.
That really depends on the oil heater, no? You can't compare a heater from the 70s with a modern one. That's like saying I don't drive modern cars because cars in the 70s were unsafe and stank.
>>manmal+(OP)
Needing an oil tank, smell, expensive (oil price typically increased drastically compared to the beginning), pollution, and, as I said, made illegal in cities for various reasons, pollution and expenses related to dig up and get rid of the oil thank, and more.