[jrdamien]

I am replacing a radiator to save space. It ties into the hot water system w/ send and return pipes but also ties in the entire radiator system with a 3rd pipe that goes into the expansion tank. Does anyone know if they make newer flat panels that can be fit into such a system?

 

[biggles]

check out these styles http://www.runtalnorthamerica.com/residential_radiators/index.html

 

[jrdamien]

Yes

precisely what I am looking for, but I don't see anything with three "holes."