The circulating pump is surprisingly powerful. The heating element might make a decent load resistor too.
P.S. There is, of course, the control panel too. Depending on the age, it will have displays, buttons, through hole and SMD parts, maybe a piezo sounder etc. that can be salvaged. I'm not sure how far along you are yet, but at the very least, it will be useful for practising your soldering and desoldering skills without risk of damaging something that you are actually trying to repair.