I have 2 gas heaters (both unflued)
A convector (this model)
http://www.binglee.com.au/rinnai-av25s-avenger-25-convector-111
A radiant (similar to this one, but much older)
http://www.binglee.com.au/rinnai-252s-granada-252-radiant-heater-24482
I switched them around to use in the living room...