I Don't Have Any Hot Water Coming Into My Sink In My Bathroom.....

[CaptainTruth]

7. Professional contractor, I've been doing plumbing for decades, one easy troubleshooting trick is...

Turn off both shutoff valves.

Swap the supply lines. (Disconnect both lines & connect each one to the OTHER shutoff valve.)

Turn on shutoff valves, & check flow by turning on the faucet valves.

If Hot (faucet valve) still has low flow, the Hot faucet valve is clogged.

If Cold (faucet valve) now has low flow, the Hot shutoff valve is clogged.

Remember, supply line connections have big rubber washers, so do NOT tighten them like you would a pipe fitting. Be gentle. You can always tighten a bit more if you turn on the shutoff & see a drip.

One of my customers had this exact problem not long ago. Turned out the hot shutoff valve was clogged, just in one bathroom. Hot water heaters have plastic "dip tubes" in them & the dip tubes had started disintegrating. Little pieces of plastic made it through the hot water pipes & piled up inside the hot shutoff valve, clogging it up. I told them to keep an eye on their hot water heater because if the dip tubes were disintegrating it was close to the end of its life. Sure enough, about 2 months later I was back installing a new water heater because it had started dripping on their garage floor.