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Natural Gas vs Propane Generator
Compare fuel supply, run time, output and setup for a home standby generator, then get a free written estimate for your address.
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Choosing a Natural Gas vs Propane Generator setup starts with one question: what fuel can reach your yard? Both fuels power the same kind of home standby generator, but they change the pad location, the run time and the setup cost. This Natural Gas vs Propane Generator guide walks through each difference so you can pick with the facts in front of you.
If a gas main already feeds your furnace, natural gas is usually the simpler choice. If your road has no main, propane in a tank on your property is the practical answer. The rest of this page covers output ratings, tank size, winter outages, cost factors and who handles each part of the job. It sits under our whole house generator installation overview, which explains the full process.
Lectro's tip
Before you pick a fuel, call your gas utility and ask one thing: does a natural gas main run on my street?
Natural gas fits when
A gas main already runs to your house
You want no tank to place, watch or refill
Your gas meter can carry the extra load
You expect long outages and want steady fuel
Propane fits when
Your road has no natural gas main
You have room for a tank at a safe distance
You want the generator's higher listed output
You will keep a supplier and a delivery plan
Can a home standby generator run on natural gas or propane?
Yes. Most air-cooled home standby generators are built to run on either fuel. The installer sets the fuel type at startup, following the manufacturer's instructions for that model. So the question is rarely whether a generator can run on natural gas. It is which fuel suits your property.
A natural gas generator draws fuel from the same utility main that feeds your furnace, water heater and dryer. A propane generator draws from a tank on your property that a supplier fills. The generator, transfer switch and wiring are the same either way. The fuel side is what changes.
Natural gas vs propane, side by side
Question | Natural gas | Propane |
|---|---|---|
Where the fuel comes from | Utility main to your gas meter | Tank on your property, filled by a supplier |
Run time in an outage | As long as the utility keeps gas flowing | Limited by tank size and how full it is |
Refills | None | Scheduled or on request from your supplier |
Listed output | Often a little lower on the same model | Often the higher listed rating |
Setup items | Gas line from meter to pad, possible meter upgrade | Tank, tank placement and a line from tank to pad |
Usually fits | Homes in town and subdivisions on a gas main | Rural and acreage lots with no main |
For most homeowners, the road in front of the house settles this table. If you have both options, the sections below show where the real differences lie.
When a natural gas generator for home makes sense
Many homes in and around Belleville and Van Buren Township sit on a gas main. For them, a natural gas whole house generator is the usual pick. There is nothing to refill, and fuel keeps coming as long as the utility system is running.
Check your gas meter first
Your meter and regulator were sized for the gas appliances you already own. A standby generator at full load can need a lot more gas. Call your gas utility and ask whether your meter can carry the generator plus your furnace and water heater at the same time. If it can't, the utility may need to change the meter before startup.
The pipe run from meter to pad
Gas pipe size depends on the generator's fuel demand and the distance to the pad. A longer run usually needs a larger pipe. That is one reason pad placement and fuel planning happen at the same visit.
When a propane whole house generator makes sense
A propane whole house generator is the usual answer on rural roads, acreage and farm properties where no gas main reaches. Propane works anywhere a supplier will deliver.
Tank size and usable fuel
Propane tanks are not filled to the top. Suppliers commonly fill to about 80 percent to leave room for expansion. Plan your run time on that usable amount, not the number printed on the tank. Your supplier will recommend a tank size for your generator and the outage length you want to cover.
Tank placement
Tank location follows clearance rules from the fire code and the supplier. It also needs a clear path for the delivery truck and hose. Settle the tank spot and the generator pad together, so the line between them stays short and simple.
Owned or leased tank
Some suppliers lease the tank and some sell it. Ask who owns it, who services it and whether you can buy fuel from another company later.
Output: why the kW rating changes with the fuel
A generator does not always make the same power on both fuels. Many home standby models list a lower kilowatt rating on natural gas than on propane. So a unit sold as 22 kW may show a smaller natural gas number on its spec sheet.
This matters when you size close to the edge. Read the rating for the fuel you will actually use, and size from that figure. If you are asking what size natural gas generator you need, start with the loads you want running: furnace blower, well pump, sump pump, fridge and central air. Our generator sizing guide explains starting watts and load management, which help a smaller rating cover more of the house.
Run time and cold weather in a long Michigan outage
Long outages here often come with ice storms, wind storms and deep cold. That is when fuel planning matters most.
Natural gas in the cold
There is no tank to run low. A cold snap does raise demand across the whole gas system, so your meter sizing still matters.
Propane in the cold
Propane turns from liquid to gas more slowly in deep cold. A small tank feeding a large generator can struggle to keep up. Ask your supplier about tank size for winter loads, and keep the tank topped up before storm season.
Fuel use by load
A generator at full load burns far more fuel than one carrying a few essential circuits. The manufacturer's spec sheet lists fuel use at half and full load for each fuel. Use those numbers to estimate how many days a propane tank will last at your house.
Installation cost differences by fuel
Neither fuel is always cheaper to install. The cost depends on your property, not the fuel name. We don't post a flat price for that reason.
Natural gas adds cost when the pad sits far from the meter, the pipe needs upsizing or the utility has to change the meter.
Propane adds cost when you need a new tank, a larger tank or a long line from the tank to the pad.
Both share the generator, the transfer switch, the pad, the electrical work and the permits.
Fuel prices also move from season to season. Compare the setup cost for your address first, then think about fuel use across a typical outage. The whole house generator cost guide lists every factor, so you can read any estimate line by line.
Who handles the gas line and the electrical work
A standby generator job has a fuel side and an electrical side. Gas piping is regulated work done by a licensed gas or mechanical contractor. Your gas utility handles the meter and regulator. A propane supplier sets and fills the tank.
The electrical side is the generator wiring, the automatic transfer switch installation, the connection to your panel and the electrical permit. Ask any installer to name, in writing, who runs the gas line and whether it is included in the price. Our written estimates list each part of the job up front, with no hidden charges.
Many townships and cities require a separate mechanical or gas permit along with the electrical permit. Confirm current requirements for your address with your building department. The generator permit guide explains which permits are common and what gets inspected.
Questions to ask before you choose a fuel
For your gas utility
Does a natural gas main run on my street?
Can my meter supply a generator at full load along with my other gas appliances?
If the meter needs an upgrade, who schedules it and how long does it take?
For a propane supplier
What tank size do you suggest for this generator and the outage length I want?
Do I buy the tank or lease it?
How do you handle deliveries during a regional storm?
For your installer
What is this model rated for on my fuel?
Where will the pad go, and how far is it from the meter or tank?
Who runs the gas line, and is it in the written price?
Generac, Honeywell and Kohler on either fuel
3D Electric installs and services Generac, Honeywell and Kohler home standby generators. Two installs from our own photo gallery are a 22 kW Generac and a 22 kW Honeywell, both running on natural gas.
See how a Generac generator installation goes from site visit to startup. If you are weighing another brand, our Kohler generator installation page covers that line. When you are ready, request a free written estimate and we will look at your meter or tank location, your panel and your pad site.
Generator guides
What a Generac standby job includes
Planning a Kohler unit for your home
Match kW to the loads you want covered
Every line a fair estimate should list
The full process, start to finish
Written, itemized and in advance
Frequently Asked Questions
Neither is better everywhere. Natural gas is simpler where a gas main reaches your house, because there is no tank to refill. Propane suits rural properties without a main. Your address usually decides it.
Yes. Most air-cooled home standby generators can run on natural gas or propane. The installer sets the fuel type at startup, following the manufacturer's instructions for that model.
It depends on the tank size, how full it is and how much load the generator carries. Full load burns far more fuel than a few essential circuits. Check the fuel use on your model's spec sheet and ask your propane supplier for a run-time estimate.
Many models list a lower kilowatt rating on natural gas than on propane. Read the rating for the fuel you will use and size the generator from that number.
It depends on your property. Natural gas costs more when the pad is far from the meter or the meter needs an upgrade. Propane costs more when you need a new or larger tank. A written estimate for your address is the only fair comparison.
Start with the loads you want running during an outage, such as the furnace, well pump, sump pump and fridge. Then compare that total with the model's natural gas rating, not its propane rating. Our sizing guide walks through the steps.
A licensed gas or mechanical contractor runs the pipe, and your gas utility handles the meter. For propane, the supplier sets the tank. Ask your installer to name who does each part and whether it is in the price.