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7. ELECTRICAL INSTALLATION
Please follow all electrical instructions carefully. This appliance must be installed by a licensed and
qualified electrician in accordance with all applicable national, state, provincial, and local electrical codes.
All wiring (wire gages), circuit breakers (protector), must comply with the US National Electrical Code
(NEC), in the USA, or the Canadian Electrical Code (CEC). Failure to do so could result in property
damage and/or personal injury and void your warranty.
The Canadian electrical code generally requires all wires and corresponding circuit breakers used to install
tankless water heaters shall be sized to a minimum of 125% of the maximum current rating of the water
heater. (See model specifications and details below).
Before installing this appliance make sure the house has sufficient electrical power available to handle the
maximum amperage load of the applicable model of your heater.
A.
Make sure all power sources to the unit are disconnected before doing any connection to the terminal box
and working with it. Follow the wiring diagrams based on the unit you have purchased. All mounting and
plumbing installation must be completed before proceeding with the electrical installation.
B-1. MS120C2T_U must be connected to a single double pole breaker. Read all name plates carefully and wire as
per instructions, and table 1.
Required Breaker Size to be installed in the main electrical panel
Model No.
MS120
MS150
MS 180
MS210
MS240
MS270
Breakers for
Main
Elecrical
Panel
Without the
Sub-panel
Qty. 1
Double
Pole
60 A
Qty. 2
Double
Pole
50 A
Qty. 2
Double
Pole
50 A
Qty. 3
Double
Pole
40 A
Qty. 3
Double
Pole
40 A
Qty. 3
Double
Pole
50 A
Check your local electrical code requirements for different voltage applications
Amperage requirementes are based on 240 v
Table 3
