[TheForge] Gas heater question

[Paul Sperbeck]

On 11/20/2013 07:37 AM, Andrew Vida wrote:
> Because we have gas wells and all the free gas we can burn, I am 
> installing gas heaters in various locations in the house.  The 10' 
> deep pit I dug under the house (was a 2' crawl prior) has two large 
> openings to the outside air and the bedroom was cold last night.  I 
> will install a heater temporarily and plug the holes as best I can for 
> now, but I doubt that will suffice when it is 10* out.
>
> My question is this: I have one more gas heater on hand - a wall unit 
> I picked up at auction on the ultra-cheap - but it is jetted for 
> propane.  Can I re-jet for natural?  If so, can I just drill out the 
> existing jets or does it behoove me to buy factory   made? Since this 
> isn't a gas forge and I am not in the mood to burn down a second 
> house, I want to be more certain of what I am doing.
>
> Any help is greatly appreciated.
>
> Thanks.
>
>     -ND 


What pressure is your natural gas delivered at? I needs to be around 7" 
of water coulomb or 1/4 PSI.

Most appliance regulators can handle the input pressure from natural 
gas, which is normally delivered at 7" of water coulomb,  or propane 
which is normally piped inside the building at 11" of water coulomb. The 
appliance regulator will then reduce either of those to about 3.5" of 
water column to supply the jets.

Use the chart to get the size you need:
http://www.hvacredu.net/gas-codes/module2/Gas%20Orifice%20Capacity%20Chart.pdf

Use the btu of each propane burner and then look up that btu for natural 
gas and see what size the orifice is.

Your propane dealer may have jets available if he pulled them from a 
conversion and plays well with others...

paul
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