Thanks for the reply, Peter. This is not a capacity issue–with only two of us in the house, we should be able to get at least one hot shower, and ideally two out of a 40 gallon model. The issue is that the temperature of the water has been falling off drastically in the past couple of weeks.
I called the manufacturer yesterday, and they are sending out a new thermostat, and a new “dipstick” whatever that is. I’ll have my plumber install those, and see if it fixes the problem. They didn’t hesitate. Great customer service![img]null[/img]