Glass Flame Tube Heaters
Find pyramid flame heaters and cylindrical glass flame tube patio heaters here.
Pyramid heaters, and all torch flame heaters say "warm" and "inviting" to prospective guests. They produce a small heat circle, so people huddle close to them to stay warm. Their strength is the visuals of dancing flames they produce. Another advantage is that they heat at torso and lap level, so long as you are close.