People, be careful when using these gas heaters.
These gas heaters like any other combustion ones consume room's oxygen and also give out CO - carbon monoxide. Our rooms and buildings do not have CO alarms or detectors installed.
Make sure your room is very very well vented with fresh air flow when using these hybrid gas heaters because they still are combustion heaters.
Also called unflued heaters.
Original ones with no fault usually have low oxygen detectors and cut off gas but these used ones that are imported do not have such sensors or it's likely removed or faulty .
Efficient and safest solution is inverter AC heating. Much less power than normal electric heaters .