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if your pump works on a pressure switch (i.e when the pump pumps the back pressure switches it off (rather than a micro switch on the tap) then you shouldnt have a problem ,all the heater will be is a continuation of the cold feed to the hot tap.
BUT if your heater (and a juicy one electric wise) isnt a sealed one then your pump will happily run till it empties your tank through whatever holes it finds in the heater.
if the heater has some sort of pressure release valve (for safety reasons) if it realeases at a lower pressure than the pumps pressure again it will encourage your pump into a frenzy of tank emptying.
you will ofcourse have to wire the beast with heavy wire to a suitable trip on your mains fuseboard and make sure it has a very good earth.
a hot tap with a microswitch in tandem with your cold one will work ,the water will flow whatever tap is opened
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Topic: putting hot water in van
