Hot Topics: Wondering How to Wire Your New Water Heater? Hot Topics: Wondering How to Wire Your New Water Heater?

Here on DoItYourself.com we enjoy providing a place where home improvement novices and experts can come together to share ideas and advice. Inside our Forums, users can browse threads to see what exchanges are taking place on a topic of interest or start their own dialogue by posting something for the community to take part in. With over 250,000 members and counting, this resource is quite active, so each week we highlight one of the conversations that may just help you with your next DIY project.


Original Post: Hot Water Heater Wiring

wildduk Member

I just purchased a new Rheem elec. hot water heater.
http://www.rheem.com/product/residen...ndard-electric

50 gallon unit

I need to add a breaker at the box, as well as a disconnect next to the heater.

If I'm reading this right, it says to look at total wattage, which would be 9000, 4500 top/ 4500 bottom, and wire according to their table.

The table is showing a 50 amp breaker and 8 ga wiring.

Am I reading this correct? That seems kinda high. Or should I use the table for just 4500 watts? That would make it a 25 amp breaker and 10 ga wire.


Highlights from the Thread:

ibpooks Forum Topic Moderator

#10-2 wire and a 30A breaker. Only one heating element operates at a time. The load is "continuous" which requires the circuit sized at 125% of the heater load.


AllanJ Member

The name plate or the instructions should state the power requirements, which will take into account one element at a time being powered on.

A few "industrial grade" models will operate both elements at the same time, thus drawing 9000 watts and requiring 8 gauge wiring.


Geochurchi Member

Do you know what code article to refer to? I would follow the mfg. specs.


Read more here: //www.doityourself.com/forum/electrical-ac-dc/557407-hot-water-heater-wiring.html

Got a New Project You're Proud of?

Post it on Your Projects!