Adding extra socket share with water heater power supply

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SUMMARY

Adding an extra socket to a power supply for an instant water heater is not advisable without proper understanding of electrical systems. The original connection should not be modified to accommodate a light circuit, as the circuit designed for a tankless water heater is typically too powerful for light usage. In the USA, it is critical to maintain the integrity of the neutral wire and not interrupt it with a double pole switch. Proper reference materials and a thorough understanding of electrical wiring are essential before attempting such modifications.

PREREQUISITES
  • Understanding of electrical circuit design
  • Knowledge of double pole switch functionality
  • Familiarity with tankless water heater specifications
  • Awareness of electrical codes in the USA
NEXT STEPS
  • Research electrical circuit safety standards in the USA
  • Study the operation and wiring of double pole switches
  • Learn about the specifications and requirements for tankless water heaters
  • Consult electrical reference books or resources on safe wiring practices
USEFUL FOR

Electricians, DIY enthusiasts, homeowners considering electrical modifications, and anyone involved in residential electrical installations.

JJ1
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It is safe to add on extra socket by this way?
Original connection:
postimg.org/image/v6nshoygh/
Add-on connection:
postimg.org/image/vkoccsyu5/

The extra socket is for light usage only. Water heater is instant water heater without tank. The switch is double pole single switch.
 
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Please give me some advise.
 

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That drawing really doesn't tell us anything. If you have to ask, you shouldn't do it. If you have a reference book that explains something like this well and you completely understand it then go ahead and do it. My bet is that you will not. A circuit that feeds a tankless water heater will be too large to safely run a light circuit. In the USA we never interrupt the neutral so right off the bat you are wrong (if you are in the USA) with a double pole switch as I am assuming you will use one pole to switch the neutral and the other to switch the hot.
 
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