In a single knob shower control, how do I get a small stream of hot water for showering?
You can also buy a new shower head to change the stream pattern
For a lot of them, you can’t. It’s dumb af.
Via the shower head, that’s how you adjust flow.
What's your use case for a small stream of hot water?
Water conservation
You can push it into the wall and it will create a lower flow but won’t really come out as well. If you pull the knob out (towards you), it will increase the water pressure
Water saving shower head with multiple spray patterns
The faucet will have a side for hot and a side for cold. Usually turning the knob to the left makes it hotter, turning it to the right makes it colder
How do control water flow then
You have to pay extra for more water pressure