using:
P=250
and R=12
I=4.56
and V=54
No big difference.
That heater above is fine. The only thing is that if you could find one with a lower resistance, you could pump more power into it, with a lower voltage. You might just want to stick with that one, and concentrate on finding the PSU.
I think I've got other heater cartridge manufacturers in the WBTA WebLinks, if you really want to check it out.
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