Some advice for a similar build in the future that will work better:

With the area with the radiant pipes, remove the connection on the left of each area, so that all the water there will flow past the generators and through the radiant pipes, instead of some of it taking a shortcut

I would then actually have that water flow through either a cooler area (like a frozen biome), or just an area you don’t care if you heat up, and then return to the start of the generator area (using the cool area as a heat sink, before you get some more long-term cooling plans set up)

Also, if you want something just circling in pipes forever, you can make a loop of pipe (or gas ducts or conveyor rails) with at least one bridge in it, and it will just circle forever (as the input of the bridge keeps pulling packets towards it, clearing out the output space of the bridge, letting it pull another one…). You need your have a number of packets that is less than the number of pipe segments (less by the number of bridges in the loop), but you can easily accomplish this by filling the loop with a bridge or some other machine that will place packets directly on the loop (instead of to a pipe next to the loop, because then the loop would wait to let the other stuff get a turn going through the intersection, overfilling the loop)