I recently had a new water heater installed. Since that occurred have very little water pressure in my kitchen sink now. Any ideas?

Thanks!

My first suggestion is to clean the areator screen on the end of the faucet spout. I is possible that it might be hard to get off... but you can always buy another... it could be other things but that is the most likely thing... Good Luck

Lemmetelya gave you a great place to start. Let me carry it a bit farther.
What's happened here is when the heater was installed mineral deposits on the pipe walls were disturbed and broke loose. The first fixture making a draw, your kitchen sink, sucked the crud up into your faucet and is now blocking the flow. If you don't have any luck cleaning the screens of the aerator then click on back and give me some details about your faucet, brand name, one handle or two knobs,how old? And I'll walk you through flushing the trash out of your faucet. Regards, Tom