Tankless Hot water heater 220v/100amp

[Anonymous]

Hi, I intend to buy a tankless water heater that requires 220v / 100amp. So, I asked my maintenance guy to do a bid on converting from 220v / 40amp to 220v / 100amp. He said that all that was required was to replace the breaker with a 220v / 100amp and replace the wire with a larger gauge.
My question is, does that sound correct? He will be changing nothing that goes to the breaker box. He will only change the breaker and wire gauge. This seems to say that the amps are already in the box and ready to be used and it only takes materials that will allow that much juice to flow through them.
It is very important to me that the wiring is safe and efficent. So, I wanted a second openion before I pay for something that is not sufficent.
Thank you for your time.
Dood

[DUNBAR]

Replacing the breaker sounds right, replacing the wire gauge would constitute a new wire from the heater to the panel.


That will be a wire rated to carry a 100 amp draw.

Might want to make sure that this panel can take this much load when other electric appliances are running also.

I am not an electrician by no means, but in the installs of these units, this situation is common and a large wire is ran to water tank and sometimes even a larger service panel is used to accomodate the new heater.

Post back with how many people reside in your home, and if there are any large tubs that will be used in the process.


You need to determine gpm flow of this unit to ensure that the unit can adequately provide consistently hot water to whatever situation may arise in using this unit.

[imported_joed]

One post is enough. Any of the forums will get you an answer. You don't need to post in every forum.

[Dood]

Thank you, Dunbar.
I will live alone there. It is a small 2 bedroom condo. There is no tub, just a shower. It has a washing machine, dryer, refrigerator, range,garbage disposal, two window air units and a dishwasher in addition to the hot water heater.
Thank you.
Dood