Originally Answered: How much propane does a dryer and stove consume?
An average clothes dryer is about 35,000 btu's and a stove is roughly the same if you total up all of the burners together with the oven. But it is pretty rare that people run four burners and the oven at the same time! Maybe at thanksgiving or Christmas doing a big meal, but other than that, not likely!
The rule of thumb we use in the industry is 100,000btu's burns 1 gallon in one hour. It's actually a little less than that, but close enough...
First, let's look at the dryer. 35,000 btu's is a little over 1/3rd of 100,000. So 1 gallon of propane will be burnt every three hours that the dryer runs. So...a load a day is roughly an hour of drying. 7 hours a week, your going to be using roughly 2-1/2 - 3 gallons a week to dry clothes.
The stove is going to be running roughly the same amount of time but at less than it's full rated btu. Let's call it 20,000 btu's. You are going to be using roughly 1-1/2 gallons a week with the range.
Your total load will be 3-1/2 to 5 gallons a week...ROUGHLY! I emphasize this because there are a lot of variables that creep in here that can change these numbers one way or another. Far too many to list here without writing an essay.
You are going to have trouble running those appliances on a 100lb cylinder. I need to explain a couple of things here first, so bear with me...
A propane cylinder is not just a storage device. It is also a vaporizor. It has to absorb heat out of the air around it to make the liquid propane inside boil to produce vapor, which is what you burn. A cylinders capacity to create vapor drops as the outside temperature drops. When you get into sub zero temperatures a 100lb cylinder is lucky if it can produce 40,000btu's. Depending on where you live, a 100lb cylinder might not be able to produce enough vapor for your appliances to operate in winter. For a small load like a range, a 100lb cylinder is fine, but it won't handle large, or multiple appliances. The other issue is storage. a 100lb cylinder is only a little under 20 gallons of liquid. You are going to be changing that 100lb cylinder at least monthly, probably a little less.
We don't size a propane tank by how much fuel we want to store or how often we want to make deliveries, we size it to the btu load and environment that will be placed on it...
You really need to contact a propane company in the area and get a 100 gallon tank put there. It will supply the appliances properly. The tank will have a gauge ( which a 100lb does not) so you know how much fuel you have left, they will come fill it every 3 weeks or so for you so you don't have to worry about running out of fuel and everyone is happy at the end of the day. No muss, no fuss.
Sorry about being long winded, but I like to explain my answers, not leave people with more questions than they had in the first place!
Hope this helps!