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Connect tankless to subpanel |
 QP type 2" wide Push down breaker Plug-in breakers Fits residential panels Fits subpanels above Buy double-pole: Siemens 15-125 amp Square D 30 amp breaker Double pole GFCI |
 Buy indoor 120-240 volt: 100 amp 6 space 100 amp 8-space 125 amp 8-space 125 amp 8-space 125 amp 8-space 200 amp 20 space Subpanels at Amazon Main lug |
 Buy outdoor/ from my affiliate links: 120-240 Volt 70 amp 2-space 60-100-200 amp 2-space 125 amp 8-space Subpanels at Amazon Up to 125 amps |
 Larger image of 240 Volt subpanel Image of 120V-240V subpanel |
240
Volt Subpanel
for Tankless electric ***White Neutral wire is not needed for 240Volt breakers. Ground wire arriving from main panel can be connected to busbar at top of subpanel, or install a separate ground busbar lower on panel. Keep ground wires away from Hot connections and Hot busbars. Sometimes it is easier to add ground busbar near bottom of subpanel so ground wires can be kept away from Hot connections. Illustration shows how to install subpanel for adding more breakers to main panel With tankless electric, install 150amp breaker/ replace any 2-pole breaker close to top of panel Use 2/0 wires with 150 amp breaker 2/0 copper wire between main panel and subpanel, up to 100 feet. Install 3 40-amp breakers in subpanel to supply each of three 240Volt #8 wires going to Tankless. Read nameplate on Tankless for watt rating. #8 wire for 240Volt loads up to 7680 watts Use 50 amp breaker and #6 wire for 240volt loads above 7680 and less than 9600 watts For example tankless with single wiring terminal, might require 9600 watts or more Resources: How to install subpanel *Neutral wire is not needed if subpanel is NOT going to have 120volt breakers. Place subpanel within eyesight of Tankless to avoid disconnect requirement Disconnect lets electrician cut power to Tankless unit. Disconnect is for safety. Electrician or homeowner knows for certain when power is OFF. Never touch leaking water heater or wet water heater unless power is OFF Never run water pipes directly above tankless where leaking and condensation can drip on water heater. If tankless flooded, disconnect power and replace water heater |
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Option:
Install meter on 120-240V subpanel ***White Neutral wire not needed for 240Volt breakers. Neutral wire only necessary for 120Volt breakers Illustration shows Neutral wire in event you want a 120V-240 subpanel Meter will read all voltage that passes to subpanel Buy: New and used electric meters Buy subpanel: Main lugs at Amazon Siemens 125 amp/ 8 space at Amazon Siemens 125 amp/ 12 space at Amazon Resources: How to install electric meter on water heater or subpanel How to get electric service |
| Power cut-off -or- disconnect | |
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DisconnectElectrical Code may require disconnect at Tankless unit, if Tankless installation is not within view of main breaker boxCall local electrician for specific local code Buy: non fused safety switch: 60 amp 2-pole safety switch Pullout Disconnect at Amazon Fusable pullout disconnect 2-pole 30 amp non-fusable safety switch/ power cut-off 2-pole 60 amp non-fusable safety switch |
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End page 4/ Previous pages Page 1 2 3 Next: How to wire subpanel How to wire safety disconnect Basic house wiring |
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