I believe you are required by code to hardwire the hot water heater and not plug it into an outlet. One assumes that you are no longer using the dryer, so you could have an electrician install the proper connection box if the current dryer outlet was in the correct location. There are other rules about requiring a disconnect if you can't see the connection point from the water heater. There are lots of ways to screw this up so I don't suggest you do it if you are not qualified.
A stove is a two pole 50, and hot water heater i would recommend the same.
If it does not come with a plug on it, no. If it is made for direct wire, then 99.9% chance is that it is a 240 volt unit. If you plug it into a 120 volt outlet your water will barely get warm.
Have the outlet changed to match the configuration of the dryer plug.
It may be a 220 Dryer, and you will need a new outlet installed. There should be no extra wires when connecting the Power cord to the plug
The four blade dryer plug brings a separate ground wire from the machine to the electrical grounding system. The three blade dryer plug depended on the neutral wire of the plug to make this connection.
A stove is a two pole 50, and hot water heater i would recommend the same.
If it does not come with a plug on it, no. If it is made for direct wire, then 99.9% chance is that it is a 240 volt unit. If you plug it into a 120 volt outlet your water will barely get warm.
Have the outlet changed to match the configuration of the dryer plug.
It may be a 220 Dryer, and you will need a new outlet installed. There should be no extra wires when connecting the Power cord to the plug
does a water heater require a ground wire?
On a 3 wire dryer cord there is no green wire. The white wire coming from the outlet is connected to ground or the green screw. The black and red wires are the hot wires.
Only if you wanted to fry your hair.for God sake(and yours)buy a new cord to hook up your dryer
There is no requirement on the distance the dryer must be from a sink. Any 120 volt outlet must be GFCI protected if it is within 6 feet of a sink. There is no requirement for a 240 volt dryer outlet. I would not want the dryer right next to the sink and I would want the dryer to be on a 4 wire circuit and not a 3 wire circuit. Use common sense here.
The four blade dryer plug brings a separate ground wire from the machine to the electrical grounding system. The three blade dryer plug depended on the neutral wire of the plug to make this connection.
It is an outlet that has one hot wire, such as a household receptacle, or two hot wires, such as a dryer outlet (in the US). If the outlet has three hot wires, it would be called a 3-phase or polyphase outlet. These would normally be found only in an industrial setting.
I would not recommend trying to use an extension cord for a dryer. the better option is to either buy a longer cord that is properly sized to deal with the extra distance or have an electrician come out and either move the outlet or custom make you a longer cord for your dryer.
10/3 wire with 30 amp double pole breaker from panel box to water heater.