I am from Canada// i have a tankless water heater requiers a 120 amp
breaker .// my house heater requiers a 100 amp breaker // stove 40
amps/ cooktop 40 amps / dryer 40amps /ect... my question is can i and
how do i give priority to my water heater when in use and shut off
myhouse heat/ so i can use and install this water heater /// i have 200
amp entry // please show me how i can solve this problem without
switching to a 400 amp entry/// THANKS also how and where do i get a
power miser of that sise 100 ampss??
My experience with electric tankless is NOT good. You just can't get
the delta T up to anything useful at a GPM that makes any sense. Gas
fired tankless is outstanding, but will probably require a larger gas
supply and venting. Noritz does NOT require proprietary or expensive B
venting. If you do not have gas service, stay with conventional
Did the electric tankless just fall off a truck?
Otherwise you would think the issue of how to
power it would have been addressed before you
had it. Googling I see the power miser is a
device that allows two loads to co-exist on a
single circuit. It will switch off the low priority
load when the high priority one wants to come on.
So, it probably could be rigged to do what you
But it raises some questions. Like everytime you
draw some water, it's going to cut off power to the
heater. Which means a lot of on and off cycles.
Assuming the air handler is on the same circuit,
then the motor will be going through those frequent
cycles which isn't good for the motor longevity.
Have to wonder about the cost of energy up there.
With a 100amp heating system if it's just a resistance
one, I hope electricity is cheap.
If it were me, unless this is some kind of unique
application that requires electric tankless, I'd just sell
the tankless on Ebay and just go with a tank.
Simple solution that works.
Are you sure you know what your are doing? Most cooktops and ovens, even
when separate units, are built to run on one 40 or 50 amp line, and a dryer
normally runs on a 30 amp line. Given your accuracy, on these items, I
question your other numbers. I certainly would NOT install an electric
tankless water heater, I would use two 40 gallon tanks connected in series
to provide enough water for your use. I am in Canada too and my electric
rates are skyrocketing, how can you afford to run all this stuff?
*I don't think a power miser is what you need. I think a relay is called
for. You could have it controlled by a flow switch on the hot water line.
However that would mean that your heating system will cycle on and off more
frequently. The relay does not necessarily need to shut down the power. It
could just be wired to the heating controls (Thermostat line) which would be
cheaper than a 100 amp relay. It only needs to shut down the heating system
whenever the water heater is on.
Another possibility is to install an additional electric service and meter
just for the hot water or for the heating system.
Double check the specifications for the tankless water heater to determine
if it is the right size for your needs.
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