Tankless water heater in a rental house
I have a single family home that I am currently renting out. I can have a maximum of 4 people living there. The hot water uses in the house are as follows: bathroom (sink and shower), kitchen (sink and dishwasher), and laundry room (washing machine). The last couple of years I have been covering the utlities (up to a certain amount), so I am trying to find a way to make the place more efficient and lower the utility bills.
I have also been hearing complaints the last 2 years that the hot water doesn't last long in the house (the current water heater is a 40 gallon electric). So I have been thinking about upgrading this water heater. What do you think about a tankless water heater (electric not gas)? Would this be a suitable application for one? How long would it take to see a return on my investment? What would the estimated monthly saving be?
Any suggestions are appreciated. Thanks!