Hey Eric and anybody else. Does anybody have a AHS (alternate Heating Systems) multi fuel boiler. I burn wood and coal. I spoke to an employee and got some infomation in the mail. The seem to be built very heavy duty. The carry a 5 yr. warranty (royall has a 20). AHS has a bitmn. coal package. The baffle on the boiler is lined with firebrick. The only thing I question is the grates. Look it over on the web and tell me what you think. ( I am going to heat my garage, workshop, and home with this unit)