Anyone have an explanation for this heating system problem:
We have an oil fired boiler
Power was out for about 20 hours. Got to around 52F inside the house
When the power came back on, the heating system came on
A little bit later (within an hour) a pipe in the back of the system started discharging water. It is warm/hot water. About a gallon, 1.5 gallons per hour
Expansion tank?