Brazibay electric heater

Evening all, we are total newbies, recently acquired a Brazibay T2 Kombi, 2011 production ("Mo"). As you know, it doesn't have a heater for the cabin when driving. I've started looking for something to fit alongside the propane heater underneath the rear seat, as we want to use Mo throughout the year, not just during the summer.
There is a 12V 600W Demon Tweeks ducted heater that looks as though it could do the job.
Is there anyone out there in the Brazibay community who has come up against this issue and found a good solution?
Would be grateful for any advice or help!!

600 watts at 12 volts means a very high current of 50 amps. This doesn't look like a good idea
osg

OSG, thanks for the reply. I think the unit can output 200w, 400w or 600w so maybe working at a lower wattage would help?

Have you looked at a Webasto heater?

No, but thanks for the tip, I'll check them out!

What about the heater that Danbury fitted to the front cabs.