Welcome! Here are the website rules, as well as some tips for using this forum.
If you've found help here, check back in to let us know how everything worked out.
It's a great way to thank those who helped you.
I have a slant/fin gas boiler, probably close to 20 years old, which is connected to a single zone of old cast iron rads.
Even after running for an hour (PSI normally around 20-22 hot) the return temp gauge usually shows around 135-140. Rarely it gets to to 150 on the coldest winter days.
I don’t know if this is normal due to he type of boiler and the fact the rads and piping is prob 80 years old or if the aquastat is set low or some other issue?
Is there a way to access it to see what the low and hi temps are?
I know there can be issues when the return temp is cold and leads to condensation