We have a dynna glo zero clearance for Natural Gas

ensure that is set for natural gas.
page 12 insert included battery.
page 18 lighting pilot.

https://www.manualshelf.com/manual/dyna-glo/ir30pmdg-1/installation-guide-english.html

States

WARNING: This appliance is equipped for
(natural or propane) gas. Field conversion is not
permitted.

So the answer is No!

dyna glo natural gas heater Questions & Answers - Fixya

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1352062 Dyna Glo Natural Gas conversion to LP Gas

162.220.53.34/F/.../t1352062-dyna_glo_natural_gas_conversion_lp_gas

REMOVE GAS LINE FROM IGNIGHTER AND THERMO CUPPLING, BLOW OUT WITH AIR. RGRANT

Hi,
It may be possible, but I have never seen a conversion kit for them.
Also given that the only thing of value in one of those is the gas valve it is probably much more cost effective to just sell the one and buy the other...the difference would be the cost of the conversion kit and you have no labor involved except removal and re-installation...and that takes all of a few minutes...

heatman101

The orifices for a propane heater are much smaller so you will not be able to get the natural gas to flow properly with the current orifices.

The both the natural gas and propane valve are 1/2 psi so the valve can be used but the regulator for propane is typically 8-11 inches on the wc table and the natural gas is typically 3 lbs on the wc.

You may be able to drill out the orifices in the burner and in the pilot ods and get the unit to work.

I'm sure you can, contact the manufacturer and ask if they have a natural gas jet or orfice for your model heater, these are usually very easy to replace.

Yes it is possible and a good idea. You need to have a regulator installed to reduce the pressure to the heater and this is a simple procedure. Contact your local Propane distributor and they will probably do this free to get your business.

Ray

Yes and most larger hardware stores will carry the parts ( it should only be a connector and a small adjustment...cost...maybe $6.00 to do

All gas heaters can be converted from one type of gas to another, be it natural or propane. The problem is getting the orifice retrofit parts that fit that particular brand. If the manufacturer doesn't make them, then you are left with no choice.