[Geof]

Heaters are a resistive electrical load so you cannot hook them up to a phase converter. That only works with inductive loads like motors.

But the heating elements themselves don't care if they are connected to single phase or three phase it just needs different wiring. It is possible that you could rewire the existing heaters for single phase. But to get the same heat output it would require a larger amperage supply than was used on three phase.

What you need to do is carefully draw out the existing wire diagram and post the drawing to get some feedback on whether it will be feasible to convert it.

[the1toyplace]

Thanks for the replies. When you say you need a drawing of the wiring. Do you mean for the entire machine? I checked and found the little dot between the 22 and five.

[Al_The_Man]

Thanks for the replies. When you say you need a drawing of the wiring. Do you mean for the entire machine? I checked and found the little dot between the 22 and five.

No, just for the elements, they probably were wired in across the 3ph to a star neutral?
Al.