Gas Dryer vs Electric Dryer: What to Know

Buy the dryer that matches the hookup you already have. If the laundry room has a 240 volt outlet and no gas stub, buy electric. If it has a gas line and an ordinary 120 volt outlet, buy gas. The two machines dry clothes about equally well, and the real money in this decision is not the appliance, it is what it costs to change the hookup if you pick the other one.

That is why an appliance question keeps landing on an electrician's phone. The dryer is the easy part. The circuit behind it is the part nobody budgets for.

What each machine actually needs

An electric dryer needs a dedicated 240 volt circuit, almost always 30 amps on 10 gauge wire, ending in a dryer receptacle. It is dedicated for a reason: nothing else shares it. Worth understanding is that the machine uses both voltages at once. The heating element runs on 240, and the motor, the timer, the controls and the drum light run on 120, which is why the circuit carries a neutral as well as two hot legs. Hold onto that, because it is the reason the receptacle question further down is a safety matter rather than a plug shape.

A gas dryer needs two things from two different trades. From the gas side: a supply line with its own shutoff valve, a flexible connector rated for an appliance, and a leak test after it is connected. From the electrical side: a standard grounded 120 volt outlet, because the drum motor, the igniter and the controls still run on house power. A gas dryer with the power off is a metal box full of wet clothes.

Both types need a vent to the outside. On a gas dryer that is not negotiable and not a comfort issue, because the products of combustion leave through that duct along with the moisture.

The 3-prong versus 4-prong question

This is the single most common real problem in this whole subject, and it comes up nearly every time somebody moves a dryer from one house to another.

Two dryer receptacles are common in American houses. The older one, a NEMA 10-30, has three slots. The current one, a NEMA 14-30, has four. They are not two styles of the same thing.

In the three wire arrangement, the circuit runs two hot legs and a neutral, and the neutral does double duty: it carries the 120 volt load and it also serves as the fault path for the dryer's metal frame, which is bonded to the neutral by a strap or jumper inside the machine. The 1996 edition of the National Electrical Code ended that allowance for new circuits, and jurisdictions adopted it on their own schedules, so the mid to late 1990s is the rough dividing line. Circuits installed before it are generally permitted to stay in service, which is exactly why so many houses still have a three slot outlet on the laundry wall.

Here is why the change was made. In a three wire setup, if the neutral opens anywhere between the panel and the dryer, at a loose terminal, a corroded splice, a cord end that has been cooked for years, the neutral's other job goes with it. The frame of the dryer loses its fault path and can sit at 120 volts relative to ground. It is a metal appliance in a room with a floor drain, a water connection and often bare feet. The four wire arrangement gives the frame its own separate grounding conductor that carries no current in normal operation, so losing a neutral stops being a shock hazard.

So, the rules that follow from that, and none of these are preferences:

• The cord has to match the receptacle, and the strap inside the dryer has to match the cord. With a three wire cord the bonding strap between the neutral terminal and the frame stays connected. With a four wire cord it must be removed. Getting this backwards is the common and dangerous mistake, and it is dangerous in both directions. A four wire cord with the strap left in place puts normal neutral current onto the grounding conductor. A three wire cord with the strap removed leaves the frame with no fault path at all, which is the worst of both worlds and looks completely normal until the day it isn't.
• Never modify a plug to make it fit. No filing a prong, no cutting the ground pin, no adapter that does not carry a real ground. Change the cord, which is a listed part sold for the purpose, or change the circuit.
• Never replace a four slot receptacle with a three slot one so an older dryer can plug in. That is walking a safety rule backwards, and it puts the next owner of the house in a situation nobody documented.
• If the circuit gets replaced, extended or rerun, it is new work, and new work means four wire. You do not get to carry the old exception forward on new cable.

Our honest recommendation, when we're asked: if the wall has a three slot outlet and the run back to the panel is workable, replacing the circuit with a proper four wire one is the better answer, and it makes the next dryer somebody buys a plug-and-go job. Whether it is a quick change or a real job depends entirely on the path from the panel to the laundry room, which is why nobody can price it over the phone without knowing that.

One more item that varies by where you are. Recent code editions have expanded ground fault protection to cover some 240 volt receptacles, laundry areas included, and adoption and local amendments differ. It gets decided by what your jurisdiction has actually adopted, which is a thing to check rather than assume.

Switching from gas to electric

This is the direction that surprises people with a bill, because it means a new circuit where there wasn't one.

The work is a 30 amp double pole breaker in the panel, 10 gauge three conductor cable with a ground, a box and a four slot receptacle at the wall. What moves the cost is not the parts. It is the distance from the panel to the laundry room, whether the path runs through an unfinished basement or attic or has to be fished blind through finished walls, and whether your panel has two open slots left at all. A panel with no room turns a circuit job into a panel upgrade conversation, and that is a much bigger decision that deserves its own load calculation rather than a guess.

That load calculation matters more than people expect in an all electric house. A dryer is 30 amps of new demand, and a house on 100 amp service that already heats with electricity, heats its water with electricity and cooks with electricity may genuinely not have the headroom. The number on the main breaker does not settle it. The arithmetic does. Houses where the heat is split between gas and electric, like a lot of the housing in Buchanan, can come out very differently on this depending on which one the house actually has.

For what the circuit itself tends to run, national cost guides put a new dedicated circuit in the range of $250 to $900+ depending on the run, and we go through how that kind of number gets built in what an electrician costs in Georgia. Those are published national ranges rather than a quote from anybody, ours included.

Switching from electric to gas

The electrical half of this direction is usually the easy half, and the gas half is not ours.

Running a gas line to a laundry room, setting a shutoff valve and leak testing the connection is work for a licensed gas fitter or plumber. We will say that rather than dabble in it. What we handle is the standard grounded 120 volt outlet the machine still needs, and the old 240 volt circuit that is now retired. That last part gets skipped a lot. A dead ended cable does not get left loose behind the machine. It either comes out, or it gets terminated properly in a box with a cover that stays accessible, and the breaker gets removed or labeled so the next person opening the panel knows what they're looking at.

There is one piece of gas work that genuinely is electrical, and it gets missed constantly: bonding. Metal gas piping has to be tied into the house's grounding system, and that matters most with the yellow corrugated stainless tubing that has been going into houses since the 2000s. Its wall is thin enough that an arc which would only mark black iron pipe can perforate it, and what comes out of that hole is gas. Most of that tubing carries a bonding requirement in its own installation instructions. We wrote about that at more length on our page for Trion, a town that sells its own natural gas and where the split between who handles gas and who handles power comes up in every other conversation.

Which one costs less to run

Where natural gas is available, a gas dryer usually costs less per load, because gas is generally cheaper per unit of heat than electric resistance. That is the honest general answer and it is not the answer to your specific question.

Work yours out instead of taking a national average. Divide your gas bill by the therms on it, divide your electric bill by the kilowatt hours on it, and you have both of your real costs including every charge and rider. Then apply the gap to the loads you actually run, which for most households is a few loads of laundry a week rather than the daily use those payback calculators assume. Do it that way and you'll often find the operating difference is real but small, small enough that it takes a long time to pay back a new gas line or a new 240 volt circuit. If the property is on propane in a tank rather than piped natural gas, run the same math on your delivered price, because it changes the answer more than anything else here.

The reason we push people to that arithmetic is the same reason behind how to lower your electric bill: the size of a saving decides whether it is worth spending anything to get it, and a dryer is not one of the big loads in a house to begin with.

There is a third option worth knowing about. Heat pump dryers use a closed loop to dry clothes at lower temperatures, most of them run on a standard 120 volt circuit, and many need no vent at all, which makes them the answer for a laundry closet in the middle of a house with nowhere to duct. They cost more to buy and they run longer cycles. What they remove entirely is the 240 volt question, so they belong in the comparison even though nobody puts them on the showroom floor next to the other two. Check the manufacturer's spec sheet for whether it wants a circuit to itself.

Venting, which neither type gets to skip

Rigid or semi-rigid metal duct, the shortest run and the fewest elbows the layout allows, and a proper vent hood outside. Not the flexible foil sleeve, which sags and collects lint at every low spot. No screws pointing into the duct path either, because every screw tip is a place lint starts building a nest.

Lint is the reason this section exists. A restricted vent makes the machine run longer for the same load, which costs money on either fuel, and it is a genuine fire cause on both types. On a gas dryer, blocked venting adds carbon monoxide to the list of things that go wrong. Vent cleaning and duct work is handyman work rather than electrical work, and it is the kind of job our sister company Journey Home Services handles.

The dryer problems we actually get called for

The drum turns but nothing gets hot. On an electric dryer this is the classic, and it is diagnostic. The motor and controls run on 120 volts and the heating element runs on 240, so when the machine tumbles happily and dries nothing, one of the two hot legs is missing. Usual causes: half of a double pole breaker that has failed, a loose connection at the receptacle or in the cord, or a burned terminal. People replace a perfectly good heating element over this one every year. If a breaker is involved, why does my breaker keep tripping covers how to read what it's doing.

A receptacle or cord end that is burned, browned or melted. A 30 amp connection that has been running slightly loose for years makes heat every time the dryer runs, and the damage builds where nobody looks. If you have ever noticed a warm plug, a discolored slot or a faint burnt smell in the laundry room, that circuit needs eyes on it before the next load. That is electrical repair work, and the receptacle is rarely the only thing that needs replacing by the time it looks like that.

A dryer landed on the wrong thing years ago. In houses that have been lived in and modified continuously, laundry circuits accumulate history. The mill village housing around Lindale shows it clearly: a circuit run for a window unit in one decade, a dryer landed somewhere in the next, all of it added by different hands. Sometimes it was done well. Sometimes there is a splice sitting outside a box above a ceiling. An electrical inspection is how that gets settled, and the panel usually says where to look before anybody crawls anywhere.

No hookup at all. Garage conversions, a laundry room moved during a remodel, a house that never had a dryer in the spot the new one is going. That is a new circuit, and it is the same job described further up.

The short version

Electric dryer versus gas dryer comes down to one thing in an existing house: if the hookup is already there, use it and buy the matching machine. If you are choosing for a new laundry room and gas is already at the house, gas usually costs a little less per load and needs both a gas line and a 120 volt outlet. If there is no gas at the property, electric is the straightforward answer and the whole decision comes down to the 240 volt circuit.

Whatever you buy, match the cord to the receptacle, get the bonding strap right, and do not modify a plug to make it fit. Send us a photo of the outlet on your laundry wall and a photo of the inside of your panel with the door open, and we can usually tell you which of these situations you are actually in before anybody drives anywhere.