I'm considering the old tankless vs tank water heater question and reviewed some of the archived discussions. A couple questions occurred to me that I didn't see addressed:
I understand that people (sinks, showers) like 110F water, while machines (clothes and dish washers) like 140F water. So does anyone make a tankless water heater with two hot water outlets for two different temperatures? Tankless water heaters have those remote control units, but that seems like trouble if someone is showering while someone else raises the water temperature to use the dishwasher.
Since tankless water heaters are flow rate bound, it seems to me it would be useful to limit the flow rate to clothes and dish washers. I don't really mind if my clothes or dishes take a few extra minutes to wash, if it would impact other uses less. Are there inline flow limiters available that could be installed after the supply stop for a dishwasher or clothes washer? About 1.0 gpm would be about right, since the tankless heaters require 0.5 - 0.75 gpm to start.