Soon I will be installing my "new" Tarm boiler. I am installing it in parallel with my oil burner. A circulator pump will continuously circulate the Tarm water to the oil burner.
A while back I remember reading about cold spots inside an EFM 520 and the fix was that it was very important to have the incoming water come in at both sides of the boiler and the outgoing water going out both sides of the boiler. Is this how I should plumb my Tarm? Or would it be sufficient to just have the in/out at catty-corners (lower front-right and upper rear-left) of the boiler? Or am I over thinking this?
Is the Tarm susceptible to cold spots inside the boiler?