Traditional water heater vs tank less water heater

  Let Traditional water be alternative A and Tankless water be alternative B. For both of them I need 4 factors to let the customer compare what is better for him to buy and when he keep it for 5 or 10 years. for example, compare between initial cost, maintenance cost and electricity bill and add one more. Use excel to create a cashflow clearly label: 1. alternative description 2. elements that are include in your CFD 3. values ( for those that you have ) 4. inflow/outflow and any relationships between the variables