I have a 1957 American Standard Severn coal boiler and a New Yorker oil fired boiler.
The coal boiler was originally a gravity feed system and has two each 2" supply and return headers feeding cast iron radiators.
The oil boiler is in parallel with the coal boiler and has a pump with 1" supply and return piping. The supply and return lines have a 1" X 3/4" reducing tee with the 3/4" pipes feeding each of the 2" supply and return headers.
I was cleaning the heat exchanger on the oil boiler and noticed a couple of wet spots as seen in this pic.
I'm worried that this seepage will turn into a leak this winter. Since there are no shutoffs I can't bypass the oil boiler and would be left with no heat.
Is there something I could do now to stop the seepage.
If I was cutting the coal boiler out of the circuit, would it make any difference to feed the 2" supply lines with a 1" tee and 1" pipes rather than reducing to the two 3/4" pipes.
You can get an idea of what I plan to do in these pics, if the worst happens and the boiler starts leaking bad.