I want one but the prices are quite high.
What always works for me is a gas torch and some candle wax on a rusty nut.
 
A friend had somthing that passed high current through the part to heat it.

It was old, so probably something you could get off eBay for way less than 200 notes.
 
I experimented with one of the cheap induction heater boards off ebay and worked really well but wasn't robust and died. Any of the main brand induction heaters on ebay don't come cheap even used. This looks good value and should be robust.
 
£200, I'll stick to a blowtorch, grinder, hammer and chisel or nut splitter thanks.. :)
 
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