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Connect tankless to main breaker box
50-60 amp breaker use 6 gauge / 
6-2 wire
Buy:
6-2 wire
Southwire electric tools
NMB is house wiring
UF is underground
40-50 amp breaker use 8 gauge / 
6-2 wire
Buy:
8-2 wire
Southwire electric tools
NMB is house wiring
UF is underground
30 amp breaker use 10 gauge / 


Buy:
10-2 gauge/ 30 amp
10-3/ 30 amp
Southwire electric tools
GE-Breakers

Buy circuit breakers
Eaton CL series circuit breaker
CH circuit breakers at Amazon
Federal Pacific circuit breaker
QO circuit breakers at Amazon
double-pole breaker
Buy circuit breakers
Choose from 15 to 125 amp
Siemens circuit breaker
GE circuit breakers at Amazon
How many breakers? What size breakers?
-Breakers must match the same brand as main panel.
-Applies to 240 volt single-phase tankless water heaters
Look at label located on side of tankless unit for volts and watts. Watts divided by volts = amps
-Look at product manual or spec sheet for description of wiring: for example 3 x 50 means three 50 amp breakers. 2 x 40 means two 40 amp breakers.
-Each breaker supplies power to one element. Each element will have a set of two terminals. Wire from one breaker cannot be split to supply more than 1 element.
-Look at screw terminals located inside unit to determine how many wires are needed: 2 terminals= 1 wire, 4 terminals = 2 wires. 6 terminals = 3 wires
Main breaker warning
Screws on main breaker are HOT at all times
Even when main breaker is OFF, both screws on the main breaker are HOT
DO NOT touch main breaker screws at any time unless meter is pulled
To replace main breaker, power company must unlock metal band around meter and pull out the meter.

Resource:
What causes electrocution?
Electric safety
Main breaker box for tankless electric
Larger image
Three 50 amp 240Volt breakers
Use 50 amp breaker with 6 gauge wire
No difference if all breakers on same side of panel, or on different sides.
Requires 250 amp service and 250 amp main breaker.


Ground wire must be connected to ground busbar
Resource
Wire size chart
Main breaker Stress test

Buy:
Circuit breakers at Amazon
Shop Amazon - Industrial Electric Products
End page 3/
Back to:
Page 1: get started
Page 2: select wire and breaker size

Next:
Page 3: connect wires to main breaker panel
Page 4: Connect tankless to subpanel

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