So I have a couple rentals, two of which have 19 gallon water heaters installed, both one bedroom places. One is who knows how many years old and my tenant can take a 45 minute shower and be fine. The other is less than a year old and was just placed in service a couple months ago. The tenant just moved in a week ago and is complaining he can not take a 5 minute shower without it getting cold. Both are the same brand electric heater. When we were working on the unit there was no shortage of hot water ever. I'm not sure if there might be a problem with the water heater or the tenant is just complaining? He is a complainer but something must have triggered him to complain about it. What are your thoughts?