It is nice to see you take an interest in your steam system. Most of the time they are put in and left to fend for themselves until they break. I always like to drain the boilers I take care of down at the end of the year and flush the system by restarting it for a couple of hours with new water in it. When it cools completely down I drain them until the next heating season. I am not sure if it makes it last any longer but it sure works good the next heating season. Hope this helps to answer your question.