Sharp vs SPT Dishwashers: Key Differences

Dimensions and fit: the first difference

The most important specification to compare is size, because it decides whether a dishwasher can fit in your kitchen at all. Both Sharp and SPT make models in the two common configurations: compact and standard. The ENERGY STAR program classifies dishwashers by place-setting capacity, not by width, but the capacity and the physical dimensions usually go together. Compact models hold fewer than eight place settings plus six serving pieces, while standard models hold at least that much.

Sharp is known for countertop dishwashers that sit on the counter and connect to the faucet, as well as 18-inch built-in models designed to slide into a narrow cabinet opening. SPT also offers 18-inch built-in units, plus some larger built-in options that approach standard 24-inch sizing. When you are measuring your space, remember that a built-in model needs clearance for the standard dishwasher dimensions, including the depth of the door when it is open. An 18-inch model fits where a 24-inch unit cannot, but the trade-off is fewer place settings per load.

If the open cabinet space is exactly 18 inches wide, an SPT or Sharp unit in that width class will be the practical choice. If the space is 24 inches wide, the built-in options broaden considerably, though Sharp concentrates its 24-inch offerings in the built-in category rather than portable ones. If you rent or cannot hardwire a machine, look at portable and countertop models from either brand that do not require permanent installation. SPT has a wider range of portable models, while Sharp's countertop machines are a more common pick for small kitchens.

See how each size class plays out in practice: 18-inch dishwashers and countertop dishwashers.

Wash system: how water reaches your dishes

The wash system is what actually cleans the dishes, and it varies between models within each brand more than it varies between Sharp and SPT as a whole. Both brands offer models with a single spray arm on the bottom, which is the simplest design, and models with additional spray arms in the middle or upper area. A spray tower in the center of the lower rack can also lift water to the top rack, and this can improve coverage for tall items like stemware or bottles.

ENERGY STAR notes that dishwasher technology has improved with soil sensors, improved water filtration, and more efficient jets. Soil sensors detect whether the water coming off the dishes is still dirty and adjust the cycle accordingly, which can save water while keeping the dishes clean. If a model does not have a sensor, look for multiple cycle options so you can match the water action to the load. Sharp models often include a stainless steel interior, which helps with heat retention during the wash and dry phases. SPT models more frequently use a plastic tub, which is lighter but does not hold heat the same way.

The filter also plays a role in the wash system. A self-cleaning filter grinds food particles and flushes them away during the cycle, while a manual filter traps particles and requires periodic removal and cleaning. The choice between self-cleaning and manual filters affects maintenance effort more than cleaning results, so decide how much time you want to spend on upkeep. The number of spray arms interacts with the filter and the water pressure: more arms can mean better coverage, but only if the pump delivers enough flow to keep them spinning.

If you compare a Sharp and an SPT model of the same size and see a different number of spray arms, the one with more coverage points is usually the safer bet for heavily soiled loads. The spray arm coverage article explains why the placement of the arms matters as much as the count.

Cycle options: matching the cycle to the load

A dishwasher is only useful when it has a cycle that matches what you put in it. ENERGY STAR advises choosing a dishwasher with several wash cycle options, including a light cycle for slightly soiled dishes and options like an energy-saving wash or the ability to turn off heated dry. Both Sharp and SPT offer models that follow this pattern, but the exact cycle lists differ by model.

Common cycles on both brands include Normal, Heavy, Light or Quick, and Rinse, which is a short cycle that sprays water on dishes without detergent to keep them from drying onto the surfaces while you wait for a full load. Some models add a sanitize cycle that raises the water temperature to a level that kills bacteria, and the sanitize cycle article explains more. An auto cycle, which uses a soil sensor, is a different approach: instead of relying on your choice, it detects the load and the soil level and adjusts the water and time accordingly.

When you are comparing a specific Sharp model with a specific SPT model, make a list of the cycles you actually use. If you mostly run the same cycle every day, the number of cycles matters less than whether that one cycle works well on both brands. If you regularly wash delicate glassware or heavily soiled pots, check that the model you want has a dedicated cycle for that. The cycles explained page gives a rundown of typical options, and the normal vs auto cycle comparison shows when the sensor-driven approach saves you effort.

Another difference to check is the number of wash options within a cycle, such as heated dry, extra dry, or a half-load setting that uses less water for a small load. These options are not always labeled the same way on the two brands, so read the spec sheet carefully before deciding.

Energy efficiency and operating cost

Energy efficiency is not a direct Sharp-versus-SPT distinction, because both brands sell models that earn ENERGY STAR certification and models that do not. What matters is the specific model you choose. ENERGY STAR certified dishwashers meet strict limits on both energy, measured in kilowatt-hours per year, and water, measured in gallons per cycle. A certified standard model uses no more than 240 kWh per year and 3.2 gallons per cycle. A certified compact model, which is what many countertop and 18-inch units are, uses no more than 155 kWh per year and 2.0 gallons per cycle.

The certification is voluntary, and the government sets the efficiency specification while manufacturers choose whether to have their models tested and certified, as the ENERGY STAR program explains. When a model is certified, the savings show up over the life of the machine. ENERGY STAR estimates a certified dishwasher costs about 5,800 gallons less in water use over its lifetime compared with a non-certified model, and washing dishes in a certified machine uses less than half the energy of hand washing.

The operating cost difference between a compact and a standard model is worth noting. ENERGY STAR points out that compact models may use more energy than standard models over time because of their smaller capacity: you run more loads to wash the same number of dishes. If your household produces enough dirty dishes to fill a standard-size machine, the larger model will usually cost less per load even though it uses more water per single cycle. The energy guide label article explains how to read the yellow label on the machine to compare yearly energy cost between models.

When you compare a Sharp and an SPT model, check the ENERGY STAR status of each. If one is certified and the other is not, the certified one will use less energy and water per cycle, all else being equal.

Deciding between Sharp and SPT

The right brand depends on the space you have and the loads you wash. If you need a countertop dishwasher for a small apartment or a vacation kitchen, Sharp has a strong lineup in that format, and SPT also makes countertop models with similar capacities. Both fit on a standard countertop and connect to the kitchen faucet, which makes them countertop dishwashers rather than permanent installations.

If you have an 18-inch opening under the counter, both brands offer built-in models that fit. This is the size class where 18-inch built-in dishwashers make sense for small kitchens, and the place settings you need determine how often you run it. For a larger household, a standard 24-inch model from either brand holds more per load, which means fewer cycles and less water use over a week.

If you cannot make a permanent installation, look at portable models, which roll up to a sink and connect with a faucet adapter. SPT has more portable options than Sharp, so that format is more about the model than the brand. The portable dishwasher hookup article explains the connection steps, and the built-in vs portable comparison helps with the trade-offs.

Before you pick a brand, compare the specific specs: the width and height against your cabinet opening, the place-setting capacity, the number of spray arms, the cycle list, and the ENERGY STAR status. Both Sharp and SPT make reliable small dishwashers, and the model with the wash system and cycles you need is the one to buy. For an overview of each brand's lineup, see our Sharp dishwasher guide and SPT dishwasher guide.

What to pick for your use

Questions

Which is better: Sharp or SPT dishwasher?

Neither brand is objectively better. Both make compact and standard-size dishwashers with similar cycle options. The right choice depends on the dimensions of your space, the place-setting capacity you need, and whether the model you compare has the wash system features that matter to you, such as a soil sensor or multiple spray arms.

Are Sharp and SPT dishwashers the same size?

Both brands sell models in the compact and standard size classes, but the exact dimensions vary by model. Always measure the width, height, and depth of the opening, and compare it against the spec sheet of the specific model. An 18-inch Sharp model and an 18-inch SPT model are designed for the same width opening, but the height and depth may differ slightly.

Do Sharp and SPT dishwashers use the same cycles?

The cycle lists overlap but are not identical. Most models from both brands include Normal, Heavy, Quick or Light, and Rinse. Some add a sanitize cycle or an auto cycle that uses a soil sensor. Compare the cycles on the exact model you want, and check for options like heated dry or a half-load setting if you need them.

Which brand is more energy efficient?

Energy efficiency depends on the specific model, not the brand. Look for the ENERGY STAR label on either a Sharp or SPT model. Certified compact models use no more than 2.0 gallons per cycle, and certified standard models use no more than 3.2 gallons per cycle. A model without certification will use more energy and water per load.

Can I install a Sharp or SPT dishwasher myself?

Countertop models connect to the kitchen faucet and need no permanent installation. Portable models also connect to the faucet. Built-in models require a water supply line, a drain connection, and an electrical connection, which may need a permit depending on local codes. If you are not comfortable with plumbing, hire a professional.

How many place settings do Sharp and SPT dishwashers hold?

Compact models hold fewer than 8 place settings plus 6 serving pieces, per the ENERGY STAR capacity definition. Standard models hold 8 or more place settings plus 6 serving pieces. The exact place setting count is listed on each model's spec sheet, and it is the most reliable way to compare capacity between a Sharp and an SPT unit.