Cross posting not necessary.

What unique method is being used to capture this heat? What type of
appliances, equipment?

The heat from plug loads is "captured" via heat absorbed by the
return air stream, this is mixed at the air handler and moved around
the building. For fan coils, heat pumps, etc, heat is one zone is
moved to other zones via the fluid transfer. This mechanism helps
offset the boiler load.

Is there something else you had in mind?

Chris Jones