Propane or Natural Gas: What Changes When You Move Out of Town
The appliances are not interchangeable, the pressures are different, and the cost structure is completely different. Worth knowing before you buy either.
August 18, 2026 · 6 min read
Inside the cities we work in, natural gas is piped and you never think about it. Out on acreage in Hunt County, eastern Collin County, or the rural parts of Kaufman County, there is no main to connect to and the answer is a propane tank in the yard.
People moving from a suburb to acreage often do not realise this until the first delivery invoice, and there are some practical differences worth understanding.
They are genuinely different fuels
Propane carries roughly two and a half times the energy per cubic foot that natural gas does, and it burns at a different pressure. That means the orifices in a burner — the small metering holes that determine how much fuel enters — have to be sized for the fuel.
This is why appliances are not interchangeable without a conversion kit. Running a natural gas appliance on propane without converting it delivers far too much fuel, which produces sooting, dangerous flame behaviour and carbon monoxide. It is not a small mistake.
Most modern furnaces and water heaters can be converted with a manufacturer kit, and it is legitimate work when done correctly with the pressures verified afterwards. Some appliances cannot be converted at all. Check before you buy, particularly when buying secondhand.
The cost structure is different too
- Natural gas is metered and billed for what you use, monthly. Propane is delivered in bulk and you pay per gallon at whatever the market is doing when the truck comes.
- Propane prices move seasonally. Filling in summer is typically cheaper than filling in January.
- You may lease the tank from the supplier or own it. Leasing usually ties you to that supplier; owning lets you shop on price. It is worth knowing which you have.
- Running out is a genuine event — the system has to be leak-tested and pilots relit before it is safe to use, and that is a service call.
What this means for equipment choices
Water heaters
A propane tank water heater works exactly like a natural gas one once it is correctly configured. Tankless propane units exist and work well, though they have high peak demand which matters for tank sizing and regulator capacity — worth checking before installing one on a small tank.
Heating
Propane furnaces are common on rural properties and they heat well. What is worth running the numbers on is a heat pump, because in our climate a heat pump does the majority of the winter's heating efficiently on electricity and only calls on the propane furnace during genuinely cold spells. On a property paying delivered propane prices, that dual-fuel arrangement often pays back faster than it does in town.
Generators
A standby generator running off the existing propane tank is a common and sensible addition on acreage. What it changes is your fuel planning — an extended outage running a generator consumes propane at a rate that will surprise you, and it competes with heating for the same tank.
Safety differences that matter
Propane is heavier than air. Natural gas is lighter. That single fact changes the safety picture: a natural gas leak rises and dissipates, while a propane leak sinks and pools in low areas — crawlspaces, basements, pits, floor-level spaces.
So propane gas detectors belong low on the wall, not near the ceiling. And if you smell gas on a propane property, treat low-lying areas as the hazard rather than assuming it has cleared.
- Leave the building immediately and do not operate any switch, appliance or phone inside it.
- From outside and well away, shut the tank valve if you can reach it safely.
- Call your propane supplier and the fire department from a safe distance.
- Do not go back in until it has been cleared, and have the system leak-tested before it is used again.
We do gas work on both fuels across all four counties we serve. Family-owned, based in Rockwall. TX Master Plumber TXM11693, TX HVAC TACLB2360E. (469) 338-5533.
Frequently asked
Can I use a natural gas water heater on propane?
Only after converting it with the manufacturer’s kit and verifying the pressures afterwards. Uncoverted, it will be badly overfuelled — sooting, unsafe flame behaviour and carbon monoxide risk. Some appliances have no conversion kit available at all, so check before you buy.
Is propane more expensive than natural gas?
Per unit of energy delivered it usually is, and it is also more volatile because you buy it in bulk at market prices rather than on a regulated tariff. On a rural property it is often the only option, which makes efficiency choices — a dual-fuel heat pump, for instance — worth more than they would be in town.
Where should a propane gas detector be mounted?
Low on the wall, near floor level. Propane is heavier than air and pools in low spaces, which is the opposite of natural gas. A detector mounted at ceiling height will not see a propane leak until it is severe.