Gas heater & electric heater both are available.
No, you only need gas for a gas water heater.
Turn off electric to water heater, depending on style, gas water heater may need electric turned off to it also. Turn off gas for gas water heater. If unfamiliar with removing and installing water heater, call a plumber.
Normally NO
Not if the water heater is electric
Natural gas
One way is to look for the power supply. A relatively thick electric wire indicates it's electric, but a gas-pipe, tap and pilot light indicate that it runs on gas.
a stove, if it's not electric water heater, if it's not electric
I think you need to do some checking, A GAS water heater does not normally need electrical service that large- an ELECTRIC water heater will. So- just what do you have- gas or electric?
Turn up the temperature on the heater. Gas or electric, there is a dial on the controls
It is a gas operated or electric operated appliance used to heat water.
A tankless electric water heater is a special kind of heater that heats water that flow in a pipe by either an electric element or a gas burner. Such heater can be found in stores like Home Depot and of course Amazon.