Among the variations on the graphs of the trigonometric functions are shifts--both horizontal and vertical. Such shifts are easily accounted for in the formula of a given function. Take function f, where f (x) = sin(x) .
The running costs vary from gas to electric. The average running cost for an electric water heater is $550. The average running costs of a gas water heater is $400. The difference in usage price per year is $150.
When thinking about how much you will spend to buy or replace your current water heater you must consider unit cost as well as the cost for a contractor/plumber installation. Traditional tank type heaters cost between $300 - $500, depending on the model.