[John Rogers]

One of the easiest ways to reduce fluid flow is to insert an orifice which is what that 3/8 diameter connector is acting like. So no matter what size hose you have flow will always be low. I would suggest increasing the size of the connection but if not possible due to local codes or laws then a water tank is your only option. Where I live the water line sizes are smaller now that in 1960 when our house was built so they will be more environmentally friendly........ If you put in a tank use a good filter/demineralizer system in the supply so the water will not leave spots.