Hi, I am looking for some info to help me in doing periodic maintenance to my wall hung boiler. The unit is 7 yrs since install and has no issues in 5+ yrs. I do have another ? about the operation of this unit but I will save that for later. Thanks for now

Hello, Looking for someone that might know history on the boiler we are using. We have this in our basement. The house is 100 years old, there is a coal chute and a place for fuel oil. The Boiler is now natural gas. I believe it has been converted from coal to Fuel Oil to Natural gas. Does anyone have any idea how old this is? I am thinking it has to be close to 100 years old. Steam is a great heat, but it is expensive running this. I was told it is probably less than 50% efficiency and it would run about $15k to replace with a new boiler and new piping. Anyways thanks for taking a look and if you have any information it would be neat to know. Thanks again and Happy New Year!