I thought I'd better clear up the confusion. The fake log I refer to in my previous post is one of these. Known as "firelogs" they are made of a mixture of sawdust and petroleum wax, individually wrapped and they light with the touch of a match. They are more efficient than wood logs, with one log lasting about 3 hours. They do produce ash. The only downside, as far as I am concerned, is that they burn silently, without the crackle and pop of a real fire.