How Much Does It Cost to Run a Washer-Dryer Combo?
About $0.73 per wash-and-dry cycle in a ventless condenser combo — 4.53 kWh over 3h 47m for a 10 lb warm-wash load at $0.16/kWh — or roughly $189 a year at 5 loads a week. That is about $24 a year more than a separate washer and vented dryer, not less. A heat pump combo is the one that saves: $0.45 a cycle, $118 a year.
The reason is that two different things hide inside the word “combo”: one drum instead of two, and — on newer models — a heat pump instead of a resistance element. Only the second one is worth money, and you can buy it without the first. Set your own machine, load and rate below.
Machine
One drum, resistance heat, 120V outlet.
Weighed dry. Out of the spin it holds about 2.3 kg of water, and every gram of it has to be evaporated.
This combo heats its own water, so those 1.3 kWh land on its meter and add 56m to the cycle.
Sets the cycle length, not the bill. The presets are the most a circuit may supply continuously — 80% of volts × amps.
Kilograms of water removed per kWh. This — not the wattage — is what decides the bill.
Cost of one wash-and-dry in a condenser combo
$0.73
4.53 kWh over 3h 47m — $188.65 a year at 5 loads a week. That is $23.59 a year more than a separate washer and vented dryer.
Electricity used
4.53 kWh
per cycle — 1.7 kWh washing, 2.83 kWh drying
Cycle length
3h 47m
1h 46m washing, then 2h 01m drying
Price of dryness
$0.20
per kg of water removed — a vented dryer's is $0.16
The load carries 2.3 kg of water out of the spin. At 0.8 kg per kWh that is 2.83 kWh of drying, and at 1.4 kW of drying power it takes 2.83 ÷ 1.4 = 2h 01m. Nobody chose that number. The laundry fixed the energy, the outlet fixed the power, and the hours are the quotient.
| Same 10 lb load, same rate | kWh | Cycle | Per cycle | Per year |
|---|---|---|---|---|
| Ventless condenser comboYour selection | 4.53 | 3h 47m | $0.73 | $188.65 |
| Heat pump combo | 2.83 | 3h 11m | $0.45 | $117.89 |
| Separate washer + vented electric dryer | 3.97 | 1h 35m | $0.63 | $165.07 |
| Separate washer + heat pump dryer | 2.83 | 1h 58m | $0.45 | $117.89 |
At 5 loads a week on a warm wash. Read the two heat pump rows against each other: they are the same number. Give two machines the same heat pump and the same laundry and they use the same electricity — the drum count has nothing to do with it.
Why the cycle takes 3h 47m, and why it cannot be shortened
To evaporate this load's 2.3 kg of water in the 45m a 240V vented dryer takes, the drying phase would have to draw 3,750 W. An ordinary 120V / 15A wall outlet supplies 1800 W, and the electrical code only lets a machine take 1440 W of that for hours on end. Short by 2,310 W, no machine on a wall outlet can keep a vented dryer's pace at this efficiency; it has to pay in time instead. Such a machine is not slow, it is starved. This is also why a combo is the machine that fits in a flat: the same property that makes it slow is the one that lets it plug into the wall.
Note which way the trade runs. Hours are not kilowatt-hours. A starved machine running four hours at 1.4 kW and a fast one running one hour at 5.6 kW draw the same energy, so the long cycle costs you patience, not money. What costs money is the efficiency field above — and that is a property of the drying technology, which you can change without changing the drum count.
How a heat pump dryer beats a limit that looks like physics
Evaporating a kilogram of water takes about 0.67 kWh, so a machine that supplies that heat and recovers none of it can never exceed 1.5 kg per kWh. A vented dryer comes in below that, at about 1.0, because it heats fresh air and blows it out of the house. A condenser combo does worse still, near 0.8.
A heat pump dryer runs at 2.0 and up — over the ceiling. Nothing is violated. When the vapour hits the cold coil and condenses, it gives back every joule of latent heat it absorbed in the drum, and a heat pump moves that heat into the incoming air instead of letting it escape. The electricity pays for the pumping, not the evaporating. It is exactly the argument for a heat pump heating a house, run over a drum of wet clothes.
SMER is kilograms of water removed per kilowatt-hour; the preset tiers are round numbers to reason with, not a spec sheet for any particular unit — a clogged filter, a cold room or a half-empty drum will all shave some off. The wash-phase figures match our washing machine page (a 0.4 kWh motor, plus water heating), and assume an electric water heater; with a gas water heater a separate washer's warm-wash energy moves off your electricity bill, while a cold-fill combo's stays on it. Loads are weighed dry and assumed to leave the spin holding half their weight in water. Yearly figures use 5 loads a week over 52 weeks. Nothing here includes the machine, installation, water or detergent. Not sure of your electricity rate? Check average rates by state.
How much electricity does a washer-dryer combo use?
Cycle kWh = wash kWh + (kg of water in the drum ÷ kg removed per kWh)
A dryer’s job is settled before you choose the machine. Whatever the spin cycle leaves behind has to be turned into vapour, and evaporating water takes a definite amount of energy — about 0.67 kWh per kilogram — that no engineering can talk down. So the useful measure of a dryer is not its wattage but how many kilograms of water it removes per kWh.
Worked example (10 lb load, warm wash, condenser combo at 0.8 kg/kWh, $0.16/kWh): the load leaves the spin holding 2.3 kg of water, so drying takes 2.3 ÷ 0.8 = 2.83 kWh. Add the 1.7 kWh wash and the cycle is 4.53kWh × $0.16 = $0.73 per cycle.
Where the kilowatt-hours go, by wash temperature
For a ventless condenser combo washing 10 lb at $0.16/kWh. Note that the drying column never moves: the wash temperature changes how much energy goes into heating water, not how much water ends up in the clothes. Note too what the temperature does to the clock — a combo heats its own water with a circuit-limited element, so a hot wash is not merely dearer, it is an hour longer.
| Wash temperature | Wash kWh | Dry kWh | Cycle kWh | Cost per cycle | Cycle length |
|---|---|---|---|---|---|
| Cold washMotor only — no water heating | 0.4 | 2.83 | 3.23 | $0.52 | 2h 51m |
| Warm wash~7 gal of hot water | 1.7 | 2.83 | 4.53 | $0.73 | 3h 47m |
| Hot wash~15 gal of hot water | 3.1 | 2.83 | 5.93 | $0.95 | 4h 47m |
Wash-phase figures match our washing machine page and assume electric water heating. A cold wash cuts this combo’s cycle from 3h 47m to 2h 51m, and its cost by more than a third, without touching the drying phase at all.
Why the cycle takes 3h 47m — and why that is not what costs you
Nobody designed the four-hour cycle. It is a quotient. Energy is power multiplied by time: the laundry fixes the energy, the wall socket fixes the power, and the hours are whatever is left over. To evaporate this load’s 2.3 kg of water in the 45m a vented dryer takes, a condenser combo’s drying phase would have to draw about 3,750 W. An ordinary 120V / 15A outlet carries 1800 W, and the electrical code lets a machine take only 1440 W of that continuously — which a three-hour drying phase certainly is. Short by 2,310 W, the machine pays in time. A 240V / 30A dryer outlet carries 7,200 W and has no such problem.
Hours are not kilowatt-hours
This is the mistake almost every combo review makes. A machine drawing 1.4 kW for two hours and one drawing 5.6 kW for half an hour consume identical electricity, and your meter cannot tell them apart. The slow cycle costs you an afternoon, not a bill. It is the same lesson as a variable-speed heat pump running all day at low power: long runtimes are not a fault, and short ones are not a saving.
What does cost you is the price of dryness
Divide your electricity rate by the kilograms of water a machine removes per kWh and you get a number that compares any two dryers without reference to load size or cycle length. At $0.16/kWh a condenser combo buys dryness at $0.20 a kilogram, a vented dryer at $0.16, and a heat pump at $0.08. A machine that supplied the latent heat and recovered none of it would sit at $0.11; the heat pump beats that floor because condensing vapour hands its heat back, and a heat pump catches it rather than venting it.
Cost per cycle vs. separate machines
The same 10 lb warm-wash load, put through all four machines at $0.16/kWh. Yearly figures assume 5 loads a week.
| Machine | Water removed per kWh | Cycle kWh | Cycle length | Cost per cycle | Cost per year |
|---|---|---|---|---|---|
| Ventless condenser comboOne drum, resistance heat, 120V outlet | 0.8 kg | 4.53 | 3h 47m | $0.73 | $189 |
| Heat pump comboOne drum, heat pump drying, 120V outlet | 2.0 kg | 2.83 | 3h 11m | $0.45 | $118 |
| Separate washer + vented electric dryerThe default American laundry room, on a 240V dryer circuit | 1.0 kg | 3.97 | 1h 35m | $0.63 | $165 |
| Separate washer + heat pump dryerThe same saving as a heat pump combo, in two boxes | 2.0 kg | 2.83 | 1h 58m | $0.45 | $118 |
The saving belongs to the heat pump, not to the combo
Read the last two rows against each other. A heat pump combo and a separate washer with a heat pump dryer cost exactly the same to run — $118 a year, down to the cent. That is not a coincidence in the data. Give two machines the same drying technology and the same wet clothes and there is no term left in the arithmetic that could tell them apart. The number of drums does not appear in it, because the number of drums does not evaporate any water.
What the combo buys you is the transfer, the floor space, and a vent you never have to cut through a wall. What the condenser combo costs you is $24 a year — 14% over separate machines — because a resistance element in a closed drum is the least efficient way to dry clothes on this table. Those are both defensible trades. They are just not the trade the marketing describes, which is that a combo saves energy. It does not; a heat pump does, by $47 a year, in whichever box you buy it.
Annual cost comparison table
Yearly electricity for a 10 lb warm wash at $0.16/kWh, by how much laundry a household actually does. The average US household runs about 5 loads a week.
| Machine | 3 loads/wk | 5 loads/wkTypical | 7 loads/wk | 10 loads/wk |
|---|---|---|---|---|
| Condenser combo | $113 | $189 | $264 | $377 |
| Heat pump combo | $71 | $118 | $165 | $236 |
| Separate, vented dryer | $99 | $165 | $231 | $330 |
| Separate, heat pump dryer | $71 | $118 | $165 | $236 |
The gap widens with the laundry. At 10 loads a week, choosing a heat pump over a condenser combo is worth $142 a year — which is also the point at which a combo’s cycle length starts to bind, since 3h 47m per load leaves little of a day.
Annual cost by electricity rate
The same 5 loads a week, across the range of US rates. Find your rate on your bill, then read across.
| Rate ($/kWh) | Condenser combo | Heat pump combo | Separate, vented dryer | Separate, heat pump dryer |
|---|---|---|---|---|
| $0.10 | $118 | $74 | $103 | $74 |
| $0.13 | $153 | $96 | $134 | $96 |
| $0.16 (US avg) | $189 | $118 | $165 | $118 |
| $0.20 | $236 | $147 | $206 | $147 |
| $0.30 | $354 | $221 | $310 | $221 |
Every column scales linearly with the rate, so the ranking never changes — a condenser combo is the dearest machine here in every state, and a heat pump the cheapest in every state. What the rate changes is how much the choice is worth. Find yours on the rates by state page.
Related Guides
Cost to Run a Washing Machine
The wash half of this page, on its own — and why the temperature dial is the big lever
Cost to Run a Dryer
Per-load cost for vented electric vs heat pump dryers
Cost to Run a Heat Pump
The same trick as a heat pump dryer, run over a house instead of a drum
Cost to Run an Electric Water Heater
Where a warm wash's energy comes from when the combo does not heat its own
Most Efficient Appliances
See which appliances cost the most to run
Electricity Rates by State
Find your state's average rate
Frequently Asked Questions
How much electricity does a washer-dryer combo use?
About 4.53 kWh for one wash-and-dry cycle in a ventless condenser combo — a 10 lb load on a warm wash — which is $0.73 at the US average rate of $0.16/kWh, or roughly $189 a year at 5 loads a week. Of that, 1.7 kWh is the wash and 2.83 kWh is the dry. A heat pump combo does the same laundry on 2.83 kWh, about $0.45 a cycle. The drying figure is not a property of the machine so much as of the laundry: a load leaves the spin holding roughly 2.3 kg of water, and evaporating water takes a fixed amount of energy no matter what evaporates it.
Is a washer-dryer combo cheaper to run than separate machines?
A condenser combo is dearer, not cheaper — about $0.73 a cycle against $0.63 for a separate washer and vented electric dryer, so roughly $24 a year more, or 14%. A heat pump combo is genuinely cheaper: $0.45 a cycle, saving about $47 a year (29%). The catch is that the saving belongs to the heat pump rather than to the combo. A separate washer with a heat pump dryer lands on exactly the same $118 a year, because it removes the same water at the same efficiency. Combining the two drums saves you a transfer and a square metre of floor. It does not save a kilowatt-hour.
Why does a washer-dryer combo cycle take three or four hours?
Because of the wall outlet, not the machine. Energy is power multiplied by time. The laundry fixes the energy — this load's 2.3 kg of water needs 2.83 kWh to evaporate at a condenser combo's efficiency — and the circuit fixes the power. To finish drying in the 45m a 240V vented dryer takes, the combo would have to draw about 3,750 W. A 120V / 15A outlet supplies 1800 W, and the electrical code allows only 1440 W of that for a load running continuously. Short by 2,310 W, the machine pays in time instead: 3h 47m on a warm wash. It is not a slow machine, it is a starved one — and the same trait is why it plugs into an ordinary socket in a flat.
Does the long cycle mean a combo costs more to run?
No, and this is the most common mistake made about these machines. Hours are not kilowatt-hours. A combo drawing 1.4 kW for two hours and a dryer drawing 5.6 kW for half an hour use the same electricity, and your meter cannot tell them apart. The long cycle costs you patience. What costs money is drying efficiency — kilograms of water removed per kWh — and there the condenser combo genuinely is worse: it buys dryness at $0.20 a kilogram against a vented dryer's $0.16 and a heat pump's $0.08. Judge these machines on that number and ignore the cycle timer.
How can a heat pump dryer remove more water per kWh than physics allows?
It looks that way, and it is worth understanding why it is not cheating. Evaporating a kilogram of water takes about 0.67 kWh, so a machine that supplies that heat and recovers none of it can never exceed 1.5 kg per kWh. A vented dryer manages about 1.0, because it heats fresh air and blows it out of the house; a condenser combo about 0.8. A heat pump dryer reaches 2.0 or better. The trick is that when the vapour condenses on the cold coil it gives back every joule of latent heat it absorbed in the drum, and the heat pump moves that heat straight back into the drum air instead of venting it. The electricity pays for the pumping, not the evaporating — the same reason a heat pump warms a house at a COP above one.
Do ventless combos use water to dry, and does that show up on a bill?
Many do. A water-cooled condenser combo sprays cold tap water down the drum wall to condense the steam, and that water goes down the drain during every drying phase. It is not electricity and so appears nowhere in the figures on this page, but it is a real running cost, and on a metered water supply it can matter more than the electricity difference. Air-cooled condenser and heat pump combos do not do this. If you are comparing two ventless machines, ask which way the condenser is cooled before you compare their energy labels.
Does a combo cost more to run if my water heater is gas?
Yes, and it is an easy trap. Most ventless combos are cold-fill: they take cold water and raise it with a resistance element inside the drum. A separate washer plumbed to a hot tap borrows that heat from your water heater instead. The energy is much the same either way — but if your water heater burns gas, a separate washer puts the warm-wash energy on the gas bill, where it is cheaper per unit, while a combo puts it on the electricity bill. On this page's warm wash that is 1.3 kWh a cycle changing sides. Washing cold sidesteps the question entirely and, as our washing machine page argues, costs you almost nothing in cleaning.