Florida generator guide

Your Propane Tank's 10-Foot Rule Isn't Measured From Where You Think

You want the propane tank tucked closer to the house. Shorter gas line, less trenching, less money. Makes sense. Then the installer walks the yard with a tape measure, stops, and says the spot won't pass — not because the tank's too close to the wall, but because of where the fill valve points. Here's the part almost nobody knows walking in: the 10-foot rule that governs all of this isn't measured from the tank at all.

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The tape measure starts at the valve, not the tank

Ask ten homeowners where the 10 feet gets measured from and ten of them point at the tank itself. Reasonable guess. Wrong one.

The rule Florida runs on is NFPA 58, the national propane code the state adopted into its own fire rules. And for the big aboveground tanks that feed a whole-home generator — the 250- and 500-gallon sizes — it measures the 10 feet from the fill connection and the gauge the driver reads while topping you off. Those are the spots where a little vapor puffs out during a delivery. The steel body of the tank can sit closer to some things than the valve can.

Which leads to something that sounds like a trick and isn't: two tanks in the exact same spot can pass or fail depending on which way they're turned. Spin the tank so the fill valve faces the open yard instead of the house, and a location that flunked can suddenly clear. The tank didn't move. The mouth of it did.

The generator you're feeding is itself a fire

Here's the twist that catches people. The 10 feet isn't just about the house wall. It's 10 feet from any source of ignition — and a running generator, throwing hot exhaust, is exactly that.

So the appliance you bought the tank to feed is also a thing the tank has to stay away from. Same story for the air conditioner. A central AC compressor kicking on, or a window unit, both count as ignition sources under the code. And the dryer vent — that little flap breathing warm lint out the side of the house — counts as an opening the propane isn't allowed to crowd. Fresh-air intakes and direct-vent appliance intakes, same deal.

Now line those up. When you shove the tank 'closer for convenience,' you're almost always shoving it toward the wall — which is where the AC condenser, the dryer vent, and the generator itself tend to live. The convenient spot is usually the crowded one. That's the whole reason a propane installer flags it before the trench gets dug: closer to the house is closer to everything the tank has to dodge.

And the generator has its own separate set of clearances layered on top — it wants breathing room from windows, doors, and that same dryer vent, plus space from anything that burns. So you're not solving one distance. You're solving a small puzzle where every piece pushes against the others.

In Florida this is code, not a suggestion

Some of this reads like a cautious installer being fussy. It isn't. Florida wrote NFPA 58 straight into its administrative code, along with the fuel-gas and standby-power standards. The 10 feet is the law of the yard, and your county building department is the one who signs off on it.

Two things sit on top of the state rule. Your local inspector — the authority having jurisdiction — can hold you to more, and the generator's own installation manual from Generac, Kohler, Cummins, Briggs, or Champion can demand its own spacing that the manufacturer won't warranty around. Whichever is strictest is the one you have to meet.

The cost of guessing wrong isn't a slap on the wrist. It's re-digging a trench, re-running gas line, and paying for the same yard work twice — after you've already fallen in love with a spot that was never going to pass. The measuring is supposed to happen before the shovel, not after the red tag.

Get the number for your yard, not a yard

Every foot of clearance in this article ripples straight into the price. Where the tank can legally sit sets how far the gas line runs, how much trenching you're paying for, and sometimes what size tank the setbacks even leave room for. A quote built off a generic yard is a guess dressed up as a number.

That's the gap GENERasic closes. Instead of a range that shifts once someone finally measures, GENERasic looks at your actual address and your actual yard — where the AC sits, where the dryer vents, where the tank can really go — and hands you one committed installed price for that home. The kind of number you can plan around instead of brace for.

Enter your address and get your price. Then you'll know what the spot in your yard actually costs — before anyone touches a shovel.

Common questions

How far does a propane tank have to be from a standby generator?

A running generator is a source of ignition, so the code wants 10 feet between it and the tank's fill and relief valves. On top of that, many propane suppliers and generator manuals ask for a minimum separation between the tank body and the generator. Your local inspector and the unit's manual set the final number, and the strictest one wins.

Is the 10 feet measured from the tank or from the valve?

For the aboveground ASME tanks that feed home generators, it's measured from the fill connection and the fixed liquid-level gauge — the points where vapor can escape during a delivery — not from the tank body. That's why turning a tank so the valve faces away from the house can make a tight spot pass.

Do my air conditioner and dryer vent really count?

Yes. A central AC compressor and a window unit both count as ignition sources. A dryer vent counts as a building opening, along with windows, doors, fresh-air intakes, and direct-vent appliance intakes. The tank's valves have to keep their distance from all of them, which is exactly why the spot 'closer for convenience' so often fails.

What propane code does Florida actually follow?

Florida adopted NFPA 58, the national liquefied-petroleum-gas code, into its state administrative rules, alongside the fuel-gas and standby-power standards. So the clearances aren't a company preference — they're the fire code your county building department enforces when it inspects the install.

Can I move my tank closer later to shorten the gas line?

Only if the new spot still holds every required clearance from the house, the generator, the AC, the vents, and the property line. Moving it closer usually pushes it toward those very things, which is what breaks the rule. Confirm the location before the trench is dug, because relocating afterward means paying for the same trenching and line twice.

Stop reading ranges. Get your number.

GENERasic pulls the real property, flood, and elevation data for your exact address and returns one all-in installed price — sized to your home, your fuel, and your flood elevation. The vetted local installer confirms it on site.

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