Inside, no problem, but outside ?? If it's within an awning it might be useful, but sitting outside, 400 watts of heat will just get 'blown away' and you won't get any benefit.
------------- Two drifters off to see the world.
I'm tired of reality, so I'm off to look for a good fantasy.
Agree - no point warming the great outdoors. Put on more clothes instead! If you want visual cheer, a big fat stable candle works well. You can get a flickering candle app too - I have used it in a hotel where a candle would have set off the alarm.
Amazing family weekend with old steam engines, classic car displays, market stalls, and full catering and bar. And camping on site - Save £25 by booking in advance.