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Boiler needs internal descaling?
I have a 600 thousand BTU steam boiler that was installed about 50 years ago. I flush it out on a weekly basis starting from the highest to the lowest flushing outlet. Last summer, I had my heating contractor install some parts and he mentioned that the boiler should be descaled fro the outside since there was quite a buildup of soot etc just above the gas flues and the back of the boiler. He suggested that he clean the external soot so I gave him the go.
That fall, during boiler startup, I noticed that the lowest flush cleanout was expelling steam with very little water instead of water only. After a few months, that cleanout was exhausting steam only. This was quite unusual but at least the boiler was still working. I decided to have the boiler cleaned out at the end of the heating season chich was this past spring. There are no steam boiler technicians anywhere near me and I attempted to find out if there is a way of descaling the boiler from the inside using some kind of descaling agent. The water in this area has a very high hard water rating.
Question: Not sure if I should attempt to descale the inside of the boiler with some type of solution? And, if so, what would be recommended? If I don't solve this problem I may have no choice but to replace the boiler. Any suggestions would be much appreciated.