I've bought three of these diesel heaters. One heater for heating my shed, one for heating the house and one for spare parts/backup.
I'm heating my home with this powerful heater, since prices for natural gas have gone sky high.
With outside temperatures of 10°C the inside temperature quickly raises from 17 to 20°C while using the heater on level 3.
Me and my wife are very happy with this heater and it's saving us a lot of money on the energy bill