ANSWER TO QUESTION NUMBER 3
That will depend on the type of heater you currently use and the cost of utilities in your area as well as where you are able to locate your heater. You can expect to enjoy from 30-50% savings from your SEISCO over an electric tank heater.
These savings dont come just from not heating and reheating the water in a tank, as that is only part of the costs. In addition you are not keeping water heated as hot as you do in a tank. Piping losses can easily equal the standby (loss through a tank when not used) losses.
When you locate a tankless closer to your major use areas you reduce the hot water you run before it reaches the fixture. That means less hot water left in the pipes that you had paid to heat wasted as it cools down after use.
You could actually save more, in many areas, from your SEISCO over a gas tank heater which is located in your home. Gas prices have risen and its not uncommon to see the cost for heating water with a gas tank exceeding $300.
In addition a cost that is not discussed is the cost of the loss of air through the vent in your home. This is air you paid to heat or cool. Its like leaving a window open all year. This cost can easily exceed $100 a year.