My sink has suddenly lost pressure, I ran it for about 10 seconds and it was fine, a few minutes later I turned it on and it was nothing but a drizzle. I've checked around the lines and there is no leaking and it drizzles the same in both sprayer modes.

over the last hour it has picked up a little pressure, but not much. I had a new hot water heater installed on Saturday, this issue just arose Monday night

Any help would be appreciated

speedball1

Let me first explain what has happened and then tell you how to fix it.
When you installed the new water heater you disturbed the pipes. This caused mineral buildup in the pipe walls to come loose and dislodge. The first fixture making a draw, (your sink) sucked the debris up into the faucet blocking the valve.
Since you failed to tell me the brand and type, one handle or two knobs< I can't get specific but here's what you must do.
First shut the water off at the angle stops located in the cabinet. Open up the faucet and clean the crud out of the seats or, in the case of a one handled valve, the inlet ports of the cartridge.
Next, place a pan over the open valve body to prevent splash and turn the angle stops back on for a few seconds to flush out the supplies. You may now reassemble the faucet and test.
So that this doesn't happen again from minerals building up in your new heater let me start you on a monthly maintenance schedule to prevent it.

For long life and fewer troubles you should keep your heater clear of mineral build-up by flushing on a regular schedule. let me show you how. Attach a hose to the boiler drain at the bottom of the tank. With the pressure on, open the boiler drain and let it run untill the water runs clear. You will see a spurt of red,(rust) followed by white grains,(lime or calcium carbonate). This shouldn't take more then a few minutes. Do this monthly to keep it clear. Now flush out your hot water lines on ALL fixtures. Now pull each aerator and clean the screens. Be sure you put them back togather the same way you took them out. Don't forget to flush it out every month. Your heater will thank you for it. Good luck, Tom