I replaced the expansion tank and relief valve on the wood and oil boiler. To address the previous pressure issues, I installed a larger Ex-60 expansion tank and confirmed there are no leaks in the system. The failed relief valve was replaced, and I repiped the connection to the boiler with a new code-compliant downspout. After purging air from the system, I verified that both the upstairs and downstairs heating zones operate properly with stable pressure and no leaks from the relief valve. The boiler’s high limit is set to 180 degrees and the low limit to 160 degrees. During inspection, I found significant corrosion on the fuel line running from the tank to the burner. The line is uncoated copper, and I strongly recommend replacing it with a coated copper line to prevent further corrosion. I also noted that there is no backflow preventer on the domestic water feed to the boiler. Given the well issues the property has experienced, I recommend installing a backflow preventer to prevent
