geochurchi
Senior Member
- Location
- Concord,NH
- Occupation
- Retired electrician
Hi All, aside from following mfg. requirements, what does the code require for the installation, what code article covers this?
Tankless water heaters
- Thread starter geochurchi
- Start date
- Status
- Location
- New Jersey
- Occupation
- Journeyman Electrician (retired)
Not much. Mine just has a receptacle off of a local lighting circuit.
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
Perhaps you mean an electric one? Normal ampacity and installation rules apply.
- Location
- New Jersey
- Occupation
- Journeyman Electrician (retired)
Good point the one I was referencing was natural gas.
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
I figured he wouldn't have asked if it had a plug.
- Location
- Placerville, CA, USA
- Occupation
- Retired PV System Designer
An electrical tankless, like a resistance heating element for a full house heat pump, may require multiple high amperage 240V circuits to develop the needed wattage. That will be part of the mfg. requirements, along with an EGC connection (bonding.) The Code does not really add anything to that.
Use those figures to calculate demand loads upstream (non-continuous) and follow the Code for those.
Use those figures to calculate demand loads upstream (non-continuous) and follow the Code for those.
kwired
Electron manager
- Location
- NE Nebraska
- Occupation
- EC
Art 422 Appliances.
Though there really is nothing in there for this specific appliance, but you still need to follow all general rules for appliances as well as other chapter 1-4 rules in particular selecting minimum conductor ampacity and max overcurrent protection.
- Location
- New Jersey
- Occupation
- Journeyman Electrician (retired)
Also there is no 125% requirement as there would be with up to 120 gallon storage type hot water heaters.
- Status