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.
Whether your water heater is tankless or a storage unit, the type of fuel it uses can be an indicator of the complexity and expense of repairs. Electric water heaters can typically be serviced for about $124, while it may cost $147 to repair a natural gas heater or $133 for a propane-fired appliance.