Originally Posted by
OBBob
Yeah ... you need to remember that if the place is old the fireplace was probably built for a cast iron insert that was fed with coal. Can't do that any more ... and there is an art to fireplace design. The size of the opening has to be proportioned to the chimney area etc. otherwise it won't draw and smoke will fill the house ... or as above all teh flames and he go straight up the chimney.
Don't want to put you off ... I did exactly what you prepose in my last place ... but when I removed the heater the bricks had been damaged so I had to re-brick. Then I had to do some research to get the opening right to make it run properly ... in the end it was great ... and I had plenty of old hardwood to burn from the rest of the reno's!