The plumber came and did his thing. He also installed a 1/2" flared fitting for a gas hose into the valve on the Mr. Heater.
It won't light. If you wait long enough, it will puff out the lighter. I am using one of those butane trigger lighters. The metered propane into my house is regulated - at what I don't know. I also don't know if the on/off low-med-hi valve on the Mr. Heater is also a regulator.
Mr. Google has not given me any other insight.
Any HVAC people with propane experience here?