These type were quite common when natural gas lines were first run to households in Houston:

Dearborn gas heater example just like the one I had:

https://external-content.duckduckgo.com/iu/?u=https%3A%2F%2F...

In The Heights many original homes have a smaller version(s) built into the wall, sometimes a tiny one right there above the bathtub.

After converting to showers sometimes it's right in your face while standing.

Without a full set of built-ins, there were natural gas petcocks in each major room for portables or relocatables like Dearborns.

Propane gas is relatively common, but wither way:

1) Natural gas has been a problem because the moisture in it has been freezing pipes

2) The cold has caused the pressure in propane tanks to drop, impairing their functionality.

None of this might have been a huge problem if Texas didn't keep its power grid almost completely separate from the rest of the country. That has meant they can't easily bring in capacity to cover their own lack. Though even moderate winterization would probably have significantly reduced the problems. It's not like they have to prepare for continuous -10 F.

I don't know what the geographic distribution is, but overall the state is split evenly between between natural gas and electric heat (45% each), with the remainder being misc sources like propane.