Greetings! I recently purchased a 1928 Tudor in South Minneapolis which has a... Steam Boiler Heat System! Not to be confused with a hot water system. Basically they are very similar with radiators that discharge steam into the air being one of the differences. So hopefully someone out there knows something about these systems as I am starting to find out a lot. First I have a Burnham boiler, with several additions including a Safegard low water cut off system, a McDonnell& Miller electric water feede, Conbrasco water guage and guage glass and finally a Honeywell Pressuretrol Controller. Here's what I've learned recently; my system as a external low water cut off valve that I'm supposed to open once a month to flush out the sediment chamber. I've done this and the first time I opened it it was really dark, like oil almost. I've flushed out probably 4-6 more gallons and now it is mostly gray, but not clean and clear. The sight glass for determining how much water is in the system is too cloudy to view, so I don't know how much water is in the system. I'm guessing I'll have to go back to the plumber that installed it (which was in 2003). Any other suggestions or insight?