All wiring (wire gauge) and circuit protection (breakers) must comply with the U.S. National Electrical Code (NEC) in the USA or the Canadian Electrical Code (CEC) in Canada.  Before instralling this product, ensure that the home has sufficient electrical power available to handle the maximum amperage load of the applicable model. 

Note:  The Canadian Electrical Code generally requires that all supply wires and corresponding circuit protection (breakers) used for domestic hot water heating and hydronic heating applications be sized to a minimum of 125% of the maximum current rating of the heater.

This product must be installed by a licensed and qualified electrician in accordance with all applicable national, state, provincial and local electrical codes.

As with all electrical applicances, under no circumstances should you attempt to install, repair or disassemble this water heater without first shutting off all power to the unit directly at the fuse or breaker box.  SERIOUS BODILY INJURY OR DEATH COULD OCCUR IF YOU IGNORE THIS WARNING.

Buy The AHS21, AHS24 or AHS27 Siemens Subpanel Today:   $85.00    Click Here   

Or, Order Your AHS14, AHS16 or AHS18 Siemens Subpanel Today:   $85.00     Click Here     

Please note that the Quad40 or four pole breakers are a two breaker combination.  The OUTER two poles and the INNER two poles are the breakers needed in that order.  If wired incorrectly or wires crossed then your tankless WILL NOT WORK CORRECTLY.