What brand has an built-in hot water heater? Does this mean you do not need to run a hot water line to your washer?
Mine is a Maytag Bravos, but other brands use them, too. I believe you would still need a hot water line. The heater is used in the Sanitize cycle, or you can turn on the Heat Boost button. Maybe you could get by without a hot input, and just reset all the cycles to cold wash and turn on the heat boost? I usually use heat boost on warm cycles.