A plug and outlet serves as a disconnect. In this case, some means of
locking the breaker in the off position, or locking the panel door will
suffice, if you don't want a disconnect under the sink



" wrote in message
oups.com...
Hoping someone with real experience installing these can help: we're
about to install a CEC Powerstar tankless water heater in a lav
cabinet under the sink. Unit requires a 240v 40a circuit which we're
ready to run over to the lav.

The manual states:
"When the Powerstream Pro is not within sight of the electrical
circuit breakers, a circuit breaker lockout or
additional local means of disconnection for all non-grounded
conductors must be provided that is within
sight of the appliance. (Ref NEC 422.31.)"

So, in the field, what do you guys generally do here? We don't really
want to add another (possibly expensive) box of some sort under the
cabinet; do you have to add some kind of lockable disconnect box at
the panel? Our Instahot kitchen sink unit has no such disconnect but
there it's a 120v wall-plug unit which I presume fills the bill.

Should we/could we instead simply add a 240v pigtail to this unit, and
then install an appropriate wall receptacle and therefore fulfill this
requirement?

tia