There's room beside the main board for the caps.I'm not sure I see an issue unless the physical size is prohibitive.
Yep.On the layout, what's on the new heater pcb - rectifiers, reservoir cap, and filters? ie. everything for the DC heaters?
Thanks.The one loop you should keep small is the heater AC wiring, diodes, and first reservoir cap so, your option two sounds like it'll do that.
Still twist the wires from the DC output end of your new pcb and route them back to the heater input of your main pcb.