View Full Version : Propane vs. Natural Gas Heaters

01-20-2006, 08:36 AM
What's the diff in the setup?

Del Lansing
01-20-2006, 08:51 AM
The basic difference is the size of the gas orifice. They are vented the same. Natural gas is delivered at a very low pressure 4 to 6 inches of water column. Propane appliances can use a low or high pressure system, 2 psi or 20 psi respectively. Low pressure propane appliances can generally be changed over to use natural gas. With high pressure propane you are stuck with HP propane, no change-over possible. A low pressure propane stove could be plumbed with normal black pipe from the exterior (outdoor) canister after the proper regulator is installed. Venturies are adjusted the same, blue flames, no yellow, on all types. The rubber propane hoses are for temporary outdoor use. For indoor installation with propane (low pressure) treat it like natural with black pipe and stainless flexible connector tubing.

Bill Gates
01-20-2006, 09:04 AM
And the countdown begins.

High C
01-20-2006, 09:33 AM
Another little thing, a given appliance (many can be set up to run either) will typically produce 10% more heat with natural gas, than it will with propane.

01-20-2006, 11:39 AM
I thought NG was heavier than air. Isn't that why houses blow up?

Garrett Lowell
01-23-2006, 07:32 AM
No. Houses do not use CNG. CH4 has a real specific gravity of about .54 at 20 degrees C, making it much lighter than air.
Houses blow up because the "correct" ratio of CH4 to oxygen has been established and then finds an ignition source. The ratio is 4-14%. Too low; not enough fuel. To high, not enough O2. It's a very difficult ratio to achieve accidentally, which is why there are so few houses blowing up.