I fitted the additional pump on mine Snap the one on the aux heater , mine does not have the diverter valve but it works a treat .... a 15 min run gets it warm if i let it run for 30 mins its really toasty inside , ,had no problems with battery going low or anything , but i did fit a good over spec bosch battery to it to give it a chance .
Perhaps pumping the water from close to the aux heater just works that bit better than running the resisdual heat pump ??
Superb mod well recomend it , not expensive either just the pump and a couple of pipes ,bout £100 for the parts iirc and your time
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