I recently started getting hot water coming from my cold water taps. It
stays hot for about 30 seconds before turning cold. I ruled out the taps,
and now I realize that the problem is happening at my furnace.
Nothing on my furnace has been changed recently. I have a tankless water
heater in an oil-fired Weil-McLain furnace with a 40 gallon holding tank.
Cold water gets fed into the loop that goes from the holding tank to the
tankless coil. This cold water line is heating up at the furnace and is
causing me the headache. I'm suspecting that the tankless coil in my
furnace is crudded up, and causing backpressure when the circulator kicks
in. This must be forcing hot water into the cold water side of things.
Does this seem possible?
Is changing out the tankless coil difficult? I can deal with stuck or
broken bolts on the face of it if that's the tough part. How much should a
Thanks in advance.