My inverter kerosene heater.
This type - although mine is the 4.5kw model.
https://www.ebay.co.uk/itm/NEW-INVE...856326&hash=item259510970c:g:Y5wAAOSwT4lWSgGB
If you are looking to heat a draughty workshop or garage I really recommend one of these.
I have mentioned it on here on the past and been po pooed by people who have never used one! And we all know what happens to po pooers

Advantages
Very cheap to run on Kerosene - works out at 1/4 the cost of electric
Can be run on an extension - current consumption tiny
Safe
Full heat output to room as no exhaust
Almost silent
Clean - not messy at all
No installation needed
Disadvantages
Needs a bit of ventilation or draught - not a lot just a bit
Smells on start up and shut down - just a few minutes
I obviously have a few carbon monoxide detectors dotted around just in case.
We run it for 60 hours a week.
Supposed to run on premium Parrafin but that is expensive and it is just as good on modern low sulphur kerosene.
If I was back in my draughty old farmhouse I wouldn't hesitate to use it at home as well.