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Noisy boiler problem still persists
About 5 years ago we had the boiler at our building replaced. This building has 35 units and 4 commercial spaces, the replacement boiler is a Weil-McLain Model #1088 series 1B W/A power flame burner model # cr2-go-20b dual-fired which we run on gas.
There is a strange very loud noise coming from inside sounds like towards the bottom of the boiler about 1-2 minutes after the initial start-up. Also i noticed it is even louder when it is colder outside. After about 1-2 minutes of these loud intermittent clanging or knocking sounds they stop and the boiler runs ok.
I asked a boiler installer about this and he said due to the fact that we have a tankless coil on the boiler (this supplies heat to the one basement apartment) We would need to install a "blanket" on the boiler, cost around $2500. The technician who i spoke with at Weil-McLain also indicates that this may be required. I have no idea what we should do. If anyone has had this experience and can offer us some sound advice, it would be appreciated. I have enclosed some pictures. Thank you.
Update on noise from boiler: I posted this about a month ago and installed a couple of new air vents on the return lines and it helped somewhat, but it has not completely solved this problem. So I am now reposting this in hope that i can get some further answers that would help me with this problem. I also posted pictures of the boiler and piping.