Means of disconnect, HIGH KW Tankless heater

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quattroracer

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I cant find a definitive answer in the code. I know there has to be a disconnect when hooking up this heater, if it is not in view of the service panel. Heater runs on 240V, It has 3 40a DP breakers. I have seen in the past, people using high amp plug/outlets as a substitute for hammer-style disconnects or pull-fuse style disconnects...does NEC permit this? Ive seen twist locks as well as the grey appliance 4 wire plugs, running to 3 separate outlets lined up in a row. I cant seem to find if this is actually allowed or not. It offers means of disconnecting the unit just like a disconnect would, just not as easy.

Thanks in advance!
 
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