I have no desire for an "on demand" system. I like being able to use park power for hot water vs my propane. I do have a tank much larger than the 6 gallon which I am thankful for. Even when my ex is taking a shower I don't run out of hot water even on electric and with her using it, that is saying something.
2006 GMC 2500HD CCSB 4x4 Duramax/Allison, Titan 52 gallon fuel tank, Prodigy Controller, B&W Companion Hitch
2010 Jayco Designer 35RLTS, Cummins/Onan RV QG 5500 EVAP, Progressive Industries EMS-PT50C, TST Systems 507 TPMS, RV Flex Armor Roof