How do I turn up the water pressure to my kitchen sink?
If the water pressure and flow are OK in the rest of the house the problem of low flow in the kitchen is with the shut off valves under the sink or the faucet. one or all are restricted with something. That something could be dirt or calcium from the old tank or the water lines. If the faucet is newer, most have small fittings and small lines that can plug or be restricted easily. I have had to replace the valves under my sink and clean out the fittings for the connecting lines in the faucet.