I just bought new TH Sandstorm 350 GSLR when pick up the trailer for first time Girard Tankless water heater barely made water warm. They replace with the new one and now we get hot water for 30 second and barely warm after that time. It is really worthless product and surprise that manufacturer of trailers even use such crappy water heater and don't go broke from warranty repairs....so far I don't found one person who will set yeah work great. Just to make straight me and people I talk to do just dry camping, maybe on hook up works better, but don't see reason what they will, but who knows. Will install good old water heater with the tank. Never had one problem with them in last 25 years of owning trailers .
milos