Truma Combi 6

tighthead3

I have a Truma Combi 6 in my 2014 Coachman VIP 560/4 but I only seem to get enough hot water for half a basinful and certainly not enough for a full shower.  I had a Truma Ultrastore in my previous 2004 Elddis van which was much better ...... what
am I doing wrong??