dzrtdave
Supporting Sponsor: Turtleback Trailers
The boiler type should keep up with a navy shower or better for 4 people. I use a 6 gallon but it's very high efficiency so they rate it at 9 gallon. Figuring you're mixing that with cold to make a comfortable temperature you should be fine. The tanked shower heats the water to 130-135 degrees so you have to put cold with it to shower. I've never ran out of hot water with the family.
Dzrtdave from Turtleback Trailers
Dzrtdave from Turtleback Trailers