Hydronic Heating Expansion Tank

[mike christensen]

My boiler fed hydronic heating system’s expansion tank is on a long loop between the inlet and outlet of the boiler. Any reason why this loop was installed? It has a gate valve on the loop should it be open or closed? System was installed in 1985.

 

[Fitter30]

Radiators, fin tube need some pics of your system. Not enough info.

 

[Sponsor]

 

[mike christensen]

Radiators, fin tube need some pics of your system. Not enough info.

Apologies for the blurry picture. Line from outlet of boiler does a loop under the landing on my staircase back to the inlet of the boiler. The expansion tank is tee’d off of this line. Gate valve is just before the inlet line of the boiler.

 

[Jadnashua]

While an ET will work anywhere in the heating loop, it does depend on where you have any valves that might prevent it from 'seeing' the expansion. It can help to place it near the inlet to the circulation pump so that it can help prevent potential cavitation with the 'extra' supply when the pump turns on. Can't see enough of your system to get a feel why yours is where it is, and if that was a prudent choice.