How to compare propane to Natural Gas
HELP - I think I'm doing something wrong:
I'm trying to compare NG and propane costs, not sure if I'm getting it right. (trying to decide on paypack of NG conversion for my grill - ignoring hassle factors).
Here is what I came up with and I'm asking if someone who is confident can correct me or validate me:
One 20lb standard LP tank holds about 430,000 btu/hr of fuel.
One therm of Natural Gas is 100,000 btu/hr
Since it costs me aproximately $9-10 per tank, this means I'm paying a bit over $2 per 100,000btu/hr.
My gas bill says a therm is costing me about $0.40. So that would be about $0.40 per 100,000btu/hr. That means that the lp gas is costing me more than 5x NG. Even during the worse pricing ever 2 winters ago - the NG was $0.85/therm. This would have implied still almost 1/3 the price.
HELP - I think I might be doing something wrong. I've heard NG should be about 1/2 the price of LP. Can someone either validate my analysis or correct me?