^^ rob if you have more than one female besides your wife in your house you getter have an 80 gallon water heater at least.
^ Or you need to use one of those water limiters on the shower head. Most people hate that, though.
Saving yourself thousands of $$ in future damage-
Don't know if this has already been mentioned. When installing a toilet in a 2nd floor bathroom, installing a new water cutoff valve at the wall is only another 15 mins to 1/2 hour of labor. If the valve is old it should be replaced. It will save you thousands in the long run by preventing leak from a faulty valve if you go away on vacation.