Hi everyone. I have had a wood stove for about 6 months and with the cold weather are pretty much running it all day and night. We have had a friend visit today and mentioned that the outside brick wall behind the stove is hot. I have checked and it is really really hot. I can barely keep my hand on it for more than a few seconds. Surely that can't be right? It is right behind the box but the flue goes up vertically from the top. Is there something wrong with the install?