The saltfire st4 is the larger version of the popular st2 and is a great looking modern design ultra clean burning wood and multi fuel stoveno assembly is required as the stove is ready to install and comes complete with high temperature mittgloveeasy to operate designed with simple user friendly controls no assembly is required as the stove is ready to install and comes complete with high temperature mittglovethe saltfire st4 has a heat output of 75 kw and has an efficiency of 777