twin heaters scooby bay

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hi all ive not had chance to do much to bus after a life changing 16 months or so but now ime back with avengance .i have never got round to fitting any heaters in bus so now its time.ive got a 2.2 na rjes set up very similar to the jedi night known as elusive.my question is ive brought 2 black cab rear heaters and want to know can i plumb them in series ,is there a in and out on heaters, will i need to move my header tank higher,anything else i may need to no..
thanks
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Sutton in Ashfield .Nottinghamshire
home of the robin hoodys