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Thread: Trying to figure out how long my propane will last

  1. #1

    Trying to figure out how long my propane will last

    Hi, i am in an RV this winter and i am trying to figure out how long my propane will last in my tank. So i figured the best place to ask was a math forum

    The facts that i know so far:

    1. its about 30 deg outside now.
    2. i have my windows covered up on the inside with blankets and towels.
    3. I have been timing the heater on and off and the average is that it runs for about 6 minutes and then it pauses for about 10 min and repeat all day. So i know that im losing 6 min of heat every 10 min.
    4. I have a 30 Pound propane tank (actually 2 but lets caculate 1 for now) it holds 7 gals of propane and from what i have read it will burn at the rate of about 3.5 hours per gallon of propain.
    5. I have a 25000 btu furnace.
    6. I am not using the stove or the hot water heater and the fridge is on electric.

    Im trying to calcuate this figuring a 24 hour day but i get lost in the math.

    I was wondering if anyone here could assist me in figuring out how long the 7 gals of propane will last. I know i probably gave you way too many facts and many of them dont matter but i thought i would give them to you just in case.

    Thanks so much.

  2. #2
    Elite Member
    Join Date
    Jun 2007
    Posts
    17,485
    Quote Originally Posted by durangod View Post
    Hi, i am in an RV this winter and i am trying to figure out how long my propane will last in my tank. So i figured the best place to ask was a math forum

    The facts that i know so far:

    1. its about 30 deg outside now.
    2. i have my windows covered up on the inside with blankets and towels.
    3. I have been timing the heater on and off and the average is that it runs for about 6 minutes and then it pauses for about 10 min and repeat all day. So i know that im losing 6 min of heat every 10 min.
    4. I have a 30 Pound propane tank (actually 2 but lets caculate 1 for now) it holds 7 gals of propane and from what i have read it will burn at the rate of about 3.5 hours per gallon of propain.
    5. I have a 25000 btu furnace.
    6. I am not using the stove or the hot water heater and the fridge is on electric.

    Im trying to calcuate this figuring a 24 hour day but i get lost in the math.

    I was wondering if anyone here could assist me in figuring out how long the 7 gals of propane will last. I know i probably gave you way too many facts and many of them dont matter but i thought i would give them to you just in case.

    Thanks so much.
    Quick calculation:

    The furnace is on for 6 min out 16 minutes - so in a day the furnace is on for (6/16*24*60=) 540 minutes = 9 hours/day

    gas used 1 gallon → 3.5 hours

    7 gallons → (3.5*7=) 24.5 hours → (24.5/9=) 2.72 days
    “... mathematics is only the art of saying the same thing in different words” - B. Russell

  3. #3
    Quote Originally Posted by Subhotosh Khan View Post
    Quick calculation:

    The furnace is on for 6 min out 16 minutes - so in a day the furnace is on for (6/16*24*60=) 540 minutes = 9 hours/day

    gas used 1 gallon → 3.5 hours

    7 gallons → (3.5*7=) 24.5 hours → (24.5/9=) 2.72 days
    Thanks so much i was making this way too complicated in my head. I am on a limited income and so i have to budget this.

    Thank you again so very much...

    Dave

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