Welcome to the gang PURCY, enjoy here and out in the playground.
Nice set up indeedy, very nice. I used to drive a very similar bus many moons back now and in a previous life. Only difference was, it had all seats in. Nice bus/coach to drive too. It had fabric seats with head rests and a headrest covers that were changed and sanitised each night and another set put on and so on.
Gee, we were very CV19 aware even back then.
Keep Safe out there.
__________________
Live Life On Your Terms
DOUGChief One Feather (Losing feathers with age)
TUG.......2014 Holden LT Colorado Twin Cab Ute with Canopy
DEN....... 2014 "Chief" Arrow CV (with some changes)
My guess is you are using 1.1kWh per 24 hours just to keep the tank hot & some more without U trap & uninsulated pipe.
Our 80L tank with Aircell (Kingspan) inner layer, R4 polybatts (2 layers on top of tank) & an outer layer of Aircell, reduced heat loss from 1.67kWh down to 0.95kWh per 24 hours. Measured at 15°C ambient temperature so it would be even better at the 21°C ambient standard.