1/13/2024 0 Comments 125 amp vs 200 amp breaker box![]() Going for 3x40 works on almost all panels. 15, 20, 30, 40 and 50 amp breakers are all typically around the same price. Even when they are, they often cost a lot more. But not always, and not for the manufacturer.ġ25A breakers are not as readily available as 40A breakers for some panels. However a second subpanel for general use might be a good plan. It's using nearly 120A of the 120A capacity of 1/0Al feeder, and there's no room for anything else. I wish I could say the water heater sub will solve your "out of spaces" problem, but no. The money savings using 1/0Al for part of the distance instead of #8Cu pays for the subpanel, and then some. ![]() Aluminum feeder is perfectly reliable at these large sizes. Do we want to run three #8 copper cables? Or one 1/0 aluminum cable? The 1/0 is cheaper by the foot than even one of the #8, so that's a no-brainer. So you run one fat feeder to the sub, and then your three 40A circuits in the sub to the heater hopefully nearby. The answer to “not enough spaces" is a subpanel. As such, the heater is probably not near the panel. Better off crossing the distance with wire than pipe. Because they are compact and don't need a vent, and being closer cuts down on the wait for hot water. ![]() With tankless, the heater should be as near as practicable to the point of use. Because tankless heater manufacturers aren't even slightly concerned with breaker spaces, and you are sweating what's actually not a big problem. ![]()
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