Check out Warmth for less in Manchester.. they specialize in kerosene/diesel heaters, they are fairly efficient. I have one in my garage and just fill it up every couple of days and it keeps it a constant 50-54 degrees in its lowest setting. That said I can be turned up and really crank out the heat. They are awesome little heaters though and the company is a pretty good one.

Warmth For Less (860) 649-9027

https://g.co/kgs/6MuEXi