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Yes, this unit will need significant rewiring and may be more than your electrical service can handle. That means a new larger service/breaker panel. Probably not worth the expense if that's the case. You could easily be looking at upwards of $3k for wiring if you need a new panel. Unless you currently have a 200 amp service with not much household load it's doubtful your service could handle the additional load this heater would create.
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