calculater

[J R]

when replacing a tank water heater in a dwelling unit with tankless do you calculate load for service same as you would water heater or insta hot.

 

[Smart $]

when replacing a tank water heater in a dwelling unit with tankless do you calculate load for service same as you would water heater or insta hot.

I don't see either making a difference. There is no special consideration provided in Article 220 for an electric water heater of any type. At best, a water heater can qualify as one of the 4 appliances fastened in place under 220.53. But that is true regardless of type.

So the short of it is, you calculate the same.

Welcome to the forum

 

[LarryFine]

According to 422.13, the continuous-load requirement only applies to storage-type (tank) water heaters.


Added:

Welcome to the forum

Ditto!

 

[Smart $]

According to 422.13, the continuous-load requirement only applies to storage-type (tank) water heaters.

...

...i.e their branch circuit rating... and has no effect on service load calculation. :roll:

 

[LarryFine]

...i.e their branch circuit rating... and has no effect on service load calculation. :roll:

Oh.

when replacing a tank water heater in a dwelling unit with tankless do you calculate load for service same as you would water heater or insta hot.

Yes.