Ah, sorry about that.
There have been loads of ads doing the rounds for 300Watt heaters with claims that they will hear a room quickly and 'efficiently'. They won't. British Thermal Units per hour are just a different way of expressing watts, 1 watt = 3.14 BTU/hr, 1000 watts = 3,140 BTU/hr...
There's some bullshit doing the rounds at that price point with all manner of back story. I
Sometimes it's a child genius, sometimes it's a retired astronaut.
...if you were posting this as a joke, fair enough
If not ignore them like you would a Nigerian princess.