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Just search for 'PTC Heater' on the main auction sites,
you'll want one that has a temperature of between 165C and 180C, the one I found was 175C. (oxalic starts to vapourise at 156C)
the seller I bought from was 'pedgington', at the moment he has similar lower temperatuire ones but not the one I bought listed, maybe message him to see if he's getting more stock.
80W 12V PTC Heater Element inside an Aluminium Heating Plate.
Maximum Temperature: Approx 175°C.
Dimensions: 72mm * 21mm * 6mm
"PTC Heaters have a ceramic element whose resistance greatly increases above a threshold temperature that is depend on the composition of the element. This means that PTC elements act as their own thermostat. The heater in this case has a threshold temperature of approx 175°C."(no connection, just a satisfied customer)
PMd you - did it make it?