We drained our water heater according to instructions. Once heater had refilled, all faucets in house have returned to normal water pressure except for single handle faucet in kitchen. Both hot and cold are dribbling out instead of full pressure. Have left faucet running for 8 hours and still low pressure. Any ideas to restore full pressure.

Im sure nothing is plugged up and there is no air left in the pipe. You can take a look under the sink and make sure both valves on back wall are completely open. If so you can try to disconnect the hoses from the bottom of the faucet and then open the valves to see if it's the faucet restricting the pressure. Good Luck!

Strange, not sure the faucet type but I would try this. Locate individual shut off valves for faucet hot and cold, turn them off.

Operate the faucet in all ranges with water off.

Now with faucet turned on in cold position, slowly open the cold water valve.

If you get flow, close faucet and open the hot side shut-off and slowly. Turn faucet back on.

It seems like you have some type of malfunction with faucet or air bubble trapped within the fixtures design. I doubt the tank draining caused any type of clog.

We drained our water heater according to instructions.
I hope you meant "flushed" instead of "drained". Did you remove the aerator from the spout of the kitchen faucet and try the pressure without it? Do you need instructions of how to flush your heater? Regards, Tom

Remove the screen from the head of the faucet and clean it out, chances are it is full of debris.