I have a solid fuel stove that is set into a chimney opening. I find that the majority of the heat is given off from the top of the stove and the underside of the chimney flue (concrete) is absorbing a lot of this heat. Does anyone have any suggestions on some material (non-combustible) that could be fixed to the underside of the flue to deflect the heat back into the room or at least won't absorb the heat?
A reflective material will be fairly ineffective in this instance. Stoves work better free standing set out from a wall rather than in an alcove/chimney opening.
I use one of these - but to be honest, it provides more of a talking point than for the function of moving hot air out into the room. That's not to say it doesn't do this to some extent. However, the key is to get the stove out as far as you can into the room...so extend the hearth if you have to - it will be worth it.