My DH just sent me completely bonkers about a heater. He went on about BTUs and the size of the area. I knew our wall heater was struggling, but I am the kind of person that tries warm clothes and maybe a blanket before I start spending money.

He ended up buying a kero heater - much to this pyrophobes utter dismay, but he was 100% right. It heats the whole house with the doors wide open for ventilation.

Elecy ones dont have good BTUs. We would have needed 2 of the 2000w one we had to do the lounge dining area sufficiently. But I liked it because it was high wall mounted and away from the kids. The bill was painful though. Probably would have been better if my house wasnt so open plan. If its just one moderately sized mostly enclosed room, then it would be perfect.

Oil/column heaters do get hot on the outside.

Hope some of this helped. It really depends on the room you will be putting it into for efficiency.