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Calculate LPG - Propane Consumption per Hour

LPG (propane) consumption is based on the burner size or sizes of the appliance, as some have more than one burner.

All gas appliances are rated by the manufacturers for gas consumption.

They are expressed in either MJ/hr or BTU/hr, depending on which country you live in.

The ratings are typically found in the product specifications.

Calculating Consumption per Hour

LPG - Propane
Consumption
Conversion Chart
LPG - Propane
Unit of Measure
MJ
BTU
1 Litre
25
23,700
1 KG
49
46,452
1 Gallon
96.5
91,502
1 Pound
22.8
21,594
Note: Some numbers have been rounded

To calculate LPG - Propane consumption per hour for your gas appliance requires just simple arithmetic.

You take the MJ/hr or BTU/hr ratings from the manufacturer and divide it by the relevant value in the chart above.

Example #1: A 25MJ Heater

If you have a heater that consumes 25MJ/hr, to determine the amount of liquid LPG (propane) it would consume, just divide 25 by the values in the MJ column of the consumption conversion chart.

25MJ Gas Heater25÷25 = 1 litre per hour

25÷49 = 0.51kg per hour

25÷96.5 = 0.259 gallons per hour

25÷22.8 = 1.1 pounds per hour

Example #2:  A 14,000 BTU Heater

If you have a heater that consumes 14,000 BTU/hr, to determine the amount of liquid LPG (propane) it would consume, just divide 14,000 by the values in the MJ column of the consumption conversion chart.

LPG Gas Burner14,000÷23700 = 0.59 litres per hour

14,000÷46,452 = 0.3kg per hour

14,000÷91,502 = 0.153 gallons per hour

14,000÷21,594 = 0.648 pounds per hour

If you have an appliance with more than one burner, like a cooktop, just add the burner ratings together before dividing by the chart values.

What is a Megajoule or MJ?

What is a MJ?Most people know that gas appliances are rated in Megajoules or MJ/hour.

However, many people believe that this is a measure of output.

In reality, it is a measure of the required gas input.

Output is typically measured in kilowatts.

The MJ inputs and kW outputs are directly related but are affected by the efficiency of the appliance.

What is a BTU?

A BTU – British Thermal Unit – is an old non-metric unit of measure for heat.

One BTU will raise the temperature of one pound of water by 1°F.  

BTU is used in the USA instead of MJ.  Most of the rest of the world uses MJ.

1MJ equals 948BTU, so to get an equivalent number of Megajoules, just divide the BTU rating by 948.

Appliance Output

As mentioned above, the gas consumption rating is not the same as the heat output rating.

Output is typically measured in kilowatts.  For reference, 1kW = 3.6MJ

The MJ inputs and kW outputs are directly related but are affected by the efficiency of the appliance.

For example, a 25MJ heater with a 5.8 Star energy rating has an output of 6.2kW.

Now, if you do the maths, dividing 25MJ ÷ 3.6MJ, you would expect that the output to be 6.94kW, not 6.2kW.

The difference is that, at 5.8 Stars, the heater is 89.3% efficient.

No gas appliance is 100% efficient, which is why we have the gas appliance Star rating system to judge the relative performance of different models.

Lower Settings

Appliances aren't always used on the highest setting.

For example, the popular Rinnai Avenger input is 25MJ on high but only 8.5MJ when set on low.

Hot water heaters will also automatically modulate the burner down, once the desired temperature has been achieved.

As a result, the consumption will be less than what would occur at the maximum appliance input rating.

Some manufacturers provide the consumption specifications for the lower settings, so you can still do your calculations.

Final Thoughts

You can also use the consumption per hour to determine how long a gas bottle will last. 

For example, if you have a 45kg LPG gas bottle or a 100lb propane tank, you just divide by the kg/hr or pound/hr calculated values to determine how long the gas bottle will last.

For those who can't be bothered with the maths, here is a quick reference chart with examples:

45kg LPG consumption calculator chart

 

 

 

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The information in this article is derived from various sources and is believed to be correct at the time of publication. However, the information may not be error free and may not be applicable in all circumstances.

LPG Gas Blog

Mystery of the Secret Stench

For most of us, the scent of something rotting is simply repulsive.

But for others, such as carrion-feeding vultures, hyenas and house flies, it’s a scent that means meal time!

One evening, having arrived home from a long and tiring day at the office, I was greeted at my front door by a strong but unfamiliar odour. I couldn’t quite put my finger on it…

Saying it was over powering would be putting it mildly. And, YES, I used deodorant that morning.  And, NO, I don’t eat carrion.

The wife immediately approaches and demands that I get to the root of the problem – and quickly! 

I might add here that we are in the process of selling our home, so the reek of rotting rodent could pose a problem for a petulant purchaser.

The Great Search

From where was that sickly stench stemming?

The Roof?... Under the house?... My shoes?... The Dog?

It became a real Sherlock Holmes affair, as we attempted to locate what we then thought to be a reeking rotting rodent.

Applying my keen olfactory skills – I fumbled over furniture, behind cupboards and, YES, I even ventured into the laundry (there is a first time for everything).

No luck and it was getting late.

The wife to the rescue, at least temporarily.  She ensured the house was well “aired”, purging the pungent problem. 

Problem solved?  Not at all.

We awoke the next morning greeted by the acrid aroma of our presumed new found friend still hanging about.

We were stumped!

Finally Found It

At our wits ends, and resorting to the process of elimination, we decided check our gas appliances and… Bingo!

We found the culprit!

The bayonet fitting, where we connect our very much loved portable gas heater, was emitting gas – be it ever so slowly.

I discovered that the internal bayonet stopper hadn’t sealed correctly after disconnecting the heater hose, for storage purposes.

Kudos were in order for my successful sleuthing (still waiting on them from the better half). 

Fixing the Problem

I had to settle for a chat with my friendly gas fitter. I was tempted to try and fix it myself, but then sanity set in and the gas fitter was on his way.

Left to my own devices, I probably would have jammed a screwdriver inside, trying to re-align it.  But screwdrivers are steel and steel can create sparks – not a good thing with leaking gas.

Apparently, the spring behind the stopper can sometimes misalign itself which pushes the stopper off centre and creates an opening (ever so small) for a gas leak.

The experience alerted me to the possible problem, when we disconnect our gas appliances during future spring cleanings.  Ensuring that the stopper (inside the bayonet) completely covers the opening is definitely on my checklist.  

All it took was a careful twitch of the spring loaded stopper for it to re-seat itself, creating a tight and proper seal. 

Success!

Lesson Learned

A looming divorce was adverted and our open house went through smelling like nirvana!

So, our malodorous experience wasn’t the misfortune of a poor rodent after all. 

It was a chemical called Ethyl Mercaptan, an odourant added to LPG for safety. 

LPG is naturally odourless.  So, without adding that smell of rotten cabbage (or dead rodent based on my experienced nose) we might never have known we had a leak.

Sooooo… be aware when connecting and disconnecting your gas appliances or you just might find yourself mistakenly forking out moola for a pest control visit.

 

 

 

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The information in this article is derived from various sources and is believed to be correct at the time of publication. However, the information may not be error free and may not be applicable in all circumstances.

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