If a system uses 25-30 gallons of propane, how much natural gas would it use?

I am trying to quote the cost difference using a system with propane versus natural gas. I have been quoted local energy prices in gallons ({content}.14/gal nat gas vs .40/gal propane).

Thank in advance!
Would the propane in the tank, and the natural gas from the electric company, have the BTUs suggested below? Or is that in different form? If so, then on propane the system would cost per cycle, and on natural gas .50? That doesn’t seem probable.

2 Responses to “If a system uses 25-30 gallons of propane, how much natural gas would it use?”

  1. biire2u Says:

    If you look at any conversion chart, one gallon of natural gas equals about 121 cubic feet of natural gas.

    Natural gas is generally sold by the 1000 cubic foot at around $6-8.00 a thousand.

    So a thousand cubic feet of gas is about 8.25 gallons of natural gas.
    At 14 cents a gallon that is that is only $1.16 a thousand cubic feet for natural gas, and I haven’t seen those prices except pre-Bush era, especially retail prices.

    It sounds like someone was trying to sell you natural gas. Natural gas is cheaper like OilField trash told you , but it’s not that much cheaper. It only cost more because they have to truck it to you versus pipeline, so you have more delivery cost.

  2. oil field trash Says:

    One gallon of natural gas (methane) has about 53,631 btus of heat. A gallon of pure propane has 84,381 btus of heat. This would mean to get the same about of heat from natural gas as you do from 25 gallons of propane, you would have to burn the equivalent of 39 gallons of natural gas.

    These btus as net and not gross.

    Having done all of the math, the general rule is that natural gas is cheaper than propane as a heat source.

    Note: based on the prices you have given, the costs you have calculated are correct. I would wonder if the cost for the natural gas is correct. One site I checked had a price for natural gas at closer to 60 cents per "gallon."