Trying to wire for washer/dryer combo in the garage, and we need to add a tankless water heater to get hot water to the washer. In their current location, there's a (EDIT: 15) AMP circuit for washer, and one for the dryer. Both are electric. The water heater requires up to 33A, and needs a double-pole 40A breaker. It also runs 240V (washer 110, dryer 240). To make this fit in the box, I'm hoping I can make some combo of either the washer or dryer on that double pole as well.
EDIT TO CLARIFY: We have two open spaces to work with in the panel, I'm trying to see how I can combine one of the other appliances with the heater in that open 2-pole spot. (See @Harper below)
Electrical newbie, but am I correct in thinking that the best way would be: -50A double pole with 6/3 to the heater (max 33A) and washer (Dr. Google says max 10). I already ran 10/3, but it looks like that's nowhere near enough to carry this load. It's exposed 20 feet, so I don't mind re-running. -Leave the dryer on dedicated 30A circuit.
Does this sound reasonable? Is there a simpler way that I am missing? (or is this DOA and all three need to be on different circuits?)