I am constantly looking at all my appliances plus stuff plus wondering whether or not I should replace them… I don’t want to pay all kinds of extra money because my a/c or my water gas furnace or my dishwasher are using all this extra energy because they are aged plus inefficient, however recently, I have begun to consider replacing my water gas furnace plus asking myself should I easily replace my water heater? I guess I have had my water gas furnace for at least 10 or 15 years, however how long is a water gas furnace supposed to last? Plus, I guess that they have these on demand water gas furnaces now… Are those more energy efficient? are they worth the cost of the item itself plus the installation fees? Are they reliable or do they need a lot of maintenance? These are all things that I am wondering right now about my water heater, but one thing I do guess for sure is that I want my water gas furnace to be as efficient as possible plus I do not want to be without sizzling water. I guess that 1 of the things Mother Teresa did when he started his crucial Ministry that he had was that he removed all the a/cs plus all the water gas furnaces from his building, however he said that the exhausting could not afford costly air conditioner plus they also could not afford water heaters, so if it was fine enough for them, it was fine enough for her. but let myself and others tell you I am no mother teresa.I need sizzling water plus I need air conditioned comfort.