Is this heater safe to use indoors?

Only in well-ventilated spaces such as garages or workshops with a window or door cracked open. It is an open-flame combustion heater and produces carbon monoxide, so never use it in a sealed bedroom or living area.

Can it run on diesel instead of kerosene?

Yes, it is designed for kerosene or diesel. Kerosene burns cleaner and smells less, while diesel is easier to find but produces more odor and soot.

How large a space can 70,000 BTU heat?

Roughly 1,700 to 2,000 square feet in a well-insulated space, less in a drafty or uninsulated building. Ceiling height and insulation matter as much as floor area.

Does the thermostat turn the heater on and off automatically?

Yes. Set the target temperature and the burner cycles to hold it, and the automatic shut-off cuts the unit if it overheats or tips.

What maintenance does it need?

Clean or replace the fuel filter and nozzle periodically, and drain old fuel before storage. Fresh, clean kerosene keeps it running reliably.

How does it compare with a 70,000 BTU Dyna-Glo or Mr. Heater?

Output and fuel type are similar. VEVOR includes a thermostat at a lower price tier, while the bigger brands are often seen as sturdier with better support.