More and more instant hot water systems

I switched to the Excel Tankless water heater from a 6 gallon tank. The 6 gallon heater was fine as long as we could space showers out, but we've got children that need baths (because sometimes you NEED a soaking bath to clean up some of the unholy messes they can make) and the 6 gallon heater just couldn't get the job done. Grey water tank is good for two baths before it has to dumped. I used it for doing dishes as well, it works fine. I fill up the sink with hot water and soap, let it soak, quickly rinse the dishes off after they soak. The water flow required to make the thing work is extremely low, barely a trickle. I swapped the shower head from a 2.5 GPM to a 1 GPM shower head and the water comes out toasty hot, the bathtub has to be filled up at a trickle - this was a $225 38K BTU unit not a $800 60K BTU model.