I'm assuming that you will want to bury the tank so that it's not an eyesore. Here is an article about tanks. The size of the tank can be based on the square footage of your home.

https://www.propane101.com/undergroundpropanetanks.htm

We use it for that plus on demand hot water. 500 gal in ground lasts us a year.

We use propane for cooking, a fireplace and the dryer. We have a 500 gallon buried tank. It gets filled every 2-3 years depending on the fireplace usage during the winter months.

We selected the large size because we originally used it to heat a pool also. We no longer heat the pool.

We have a 250 to support two tankless hot water, outdoor side burners, outdoor fireplace. Later two rarely used. We can go 1 1/2 - 2 years between fills if necessary. Several of my neighbors use a 125 for cooking. Whoever is doing your gas plumb should help you size your tank. As an FYI we are in Florida.

The size of the tank must be sufficient for the area of the top of the propane liquid to be sufficient to evaporate propane liquid to propane gas when the tank is at its maximum fill, the temperature is at its lowest likely value, and the maximum demand is placed on the gas flow by appliances expected to be operated at the same time.

Kaseki - that wasn't entirely helpful.

I had a post that went away....

Climate matters

Oven or just burners matters

Smallest tank that is practical - 50 gallons?

We use about 30 a year with the same appliances including oven.

Our Florida house uses propane for 6 burner range top and a gas fireplace. Also can hook up a BBQ. We have a tank that holds 56 gal. It's one of those upright small tanks you can put against an outside wall they refer to as a "Pig".

In a very cold Florida winter we use the fireplace daily, not turning on heat pump. Otherwise they top it off once a year and like David we probably use about 30 gallons. . The Utah House had a 500 Gal tank used for hot water, heating and cooking. It was filled frequently and cost an arm and a leg. I converted to NG.

I'm surprised you're still allowed to bury tanks. Personally I would not. The Florida house had a tank buried which was no longer functional, rusted out.. I had it dug up and hauled away at no small expense.

In Utah HOA rules say you have to have walls with a gate hiding propane tank and garbage cans. If you can get tank filled regularly why would you want to purchase a large tank and store all of that propane costing $$$ on your property. When the 500 gal tank got down to 30%, Id call them to come and fill it. Almost all places that sell propane delivered have regular frequent delivery schedules. I guess if you're out in the boondocks you'd want a large tank.

We have 500 gallon buried tank. It is used for our range and tankless hot water heater. It lasts over a year before needing to be refilled. They will not refill around here until it is at 25%. We are out in the boondocks.

My initial post "went away" also, thus my minimalist post. So let me augment what I wrote.

Given some maximum combination of propane appliances to be used, it should be possible to determine from their installation guides what the total propane flow rate has to be to run the appliances. This total flow rate has to be supplied by the propane surface area inside the tank when it is 85% full. If you provide your flow rate requirement to your friendly neighborhood propane distributor (we have several here in southern NH), your distributor should be able to specify the tank size for the minimum ambient temperature that it has to work at (-20F here). This size will vary with burial vs. fully exposed due to the ground being warmer in the winter, and large buried tanks will generally be in contact with soil near or below the probable frost line.

My 500 gal tank is buried, and is sufficient in propane surface area to feed my 20 kVA generator. The volume provides a relatively long operating period, but is not the criterion for cold weather operation. I'm sure that in Florida, the tank surface size can be much less for the same flow rate, and tank size can be based on usage between re-fills. It takes about 2 years with only 20 min/week operation to drop the tank fill to 65%, which is where I start thinking about agitating for a refill. If we had a power failure for a week, I would be covered for full house operation, but civilizational collapse is not addressed with this size tank.

Propane stove, two propane ovens, two propane fireplaces, propane hot water heater, propane furnace and a 17KW standby propane generator. 500 gallon propane tank it gets filled about 3 times a year. More if we’ve had to be on generator due to power outages. They only fill tank to 80 percent capacity to allow for expansion. No one around here buries the tank they don’t recommend it. Never asked why, maybe it’s because of all the rain in the winter.

At some level of fill, a propane tank can be buoyant, and rise out of fully soaked ground. So well drained soils are required for burial unless concrete anchors are used.

kaseki, thank you for the explanation. I just had the tank filled on September, 1st. It was at 32 percent and they filled it up to 80 percent. I wanted to get it before the prices started to rise for the fall and winter. $1.39 a gallon plus tax. I was thrilled thought I had won the lottery. Stay safe everyone.

Jalarse I don't know where you are but that is a very good price per gallon.

In 2017 when I took over this house in Utah propane was outrageous. I signed a contract

don't remember now the $ amount per gallon but whatever I bought would not cost more even if the price was higher It's sort of like playing the futures on the stock market.

They like hooking you in on a fixed price as you can change companies at will as long as you own your own tank. Even with a fixed guaranteed price they are making money. For me it was worth it but it was well over $2.00 per gallon and those appliances furnace, hot water heater sucked up the propane. I was freezing coming from Florida and paying huge bucks for fuel just barely staying warm. I think that first year I had the tank filled 2 or three times while wearing a down parking walking around in the house. Fun!!!

A lot of data on vaporization rates in propane tanks was once available at Growmark, but that seems to have disappeared. Here is an equivalent table to one of those in the Growmark booklet pulled from a search engine result.

Yes dont rent the tank.

In WA we just paid $1.41. That was up from last year. In 5 years I dont think we have paid more $2.