DIYbanter - View Single Post

On 2005-08-19, wrote:

BTW - I have a dishwasher as well but that to is hardwired, not
pluged and not under the sink. It runs through a wall and directly
to the back of the dishwasher.

I believe it is OK for an appliance cord to pass through a hole in a
kitchen cabinet, just not a hole in drywall. The cord from the
hardwired dishwasher should enter a junction box. This would be a
good place to tap into for power for the instant water heater. Either
hardwire the water heater here, or install a duplex receptacle in the
junction box and put a plug on the dishwasher.

You need to check that the circuit serving the dishwasher has
sufficient capacity for the water heater as well. Determine whether
the existing circuit is dedicated to the dishwasher, and whether it is
15A or 20A. Then determine the current draw for the dishwasher and
for the water heater, and make sure the sum of the current draws is
less than the rating of the circuit.

I haven't done this particular work myself, so you might want to wait
for someone else to chime in with their ideas and confirmation that I
haven't said anything stupid.

Cheers, Wayne

P.S. Just because the garbage disposal is switched (as you noted in a
separate post) doesn't mean it is entirely out of the picture. For
example, it is possible that it and the dishwasher are on the same
circuit, and that they are fed via cable with 2 hots (one unswitched,
one switched). You should probably trace the garbage disposal circuit
as well, so that you know exactly what is going on electrically,
before you add another device.