Our gas water heater is installed in the kitchen, but recently we found that the faucet in the kitch

Are the water inlet pipes in the kitchen and bathroom all together?

Looking at your situation, this is not a problem with the water heater. It should be that the water pipe in the kitchen is blocked, or the water switch in the kitchen is not smooth, and the water pressure is insufficient to catch fire.

You can take the kitchen water inlet out and take a look at it, and turn on the water to see if the water is not normal. Another point is that when you start a fire in the kitchen, because the water inlet pipe in the bathroom and the water in the kitchen are together, some of the water will flow to the bathroom, so that the water pressure will be insufficient. The pipes in the bathroom are long, and it takes a long time to fill them.

In my opinion, it's best to install a switch in the bathroom and kitchen plumbing mix to turn off the water inlet in the bathroom, and only turn it on when you are in the shower, so that it doesn't affect the kitchen.

The kitchen faucet is clogged and the water output is too small, just clean it up.