Tankless or on-demand water heaters have a lot of advantages for the homeowner who is building new or replacing an existing hot water heater. However, while there on many positives to their installation and use, there are some major drawbacks. First a little bit of descriptive information and then the pros of selecting this appliance. We will present the cons - and one critic is Consumer Report magazine - later in the week. Tankless water heaters provide hot water for household use without a storage...