Skip to Content

Do Dishwashers Connect to Hot or Cold Water? (Explained)

Dishwashers are one of the most important kitchen appliances. It is usually used for cleaning dirty plates and utensils. Water is an essential element for a dishwasher’s proper operation.

However, there has been contention over whether dishwashers should be connected to the hot or cold water lines. Let us assist you to figure out whether your dishwashers can connect to hot or cold water, as well as other fascinating facts.

Do dishwashers connect to hot or cold water?

The dishwasher is usually connected to a hot water supply. When compared to cold water, hot water cleans dishes significantly better and is far more effective at sanitizing dishes and utensils. Therefore, it is recommended to connect the dishwasher to hot water lines rather than cold water lines.

Cleaning dishes and utensils are considerably easier with hot water. It aids in the removal of stains and probable food residue from dishes and utensils in your dishwasher with the least amount of effort possible. 

As a result, connecting your dishwasher to hot water may be the best option.

In addition, hot water can aid in the removal of harmful bacteria from your dishes. You are aware that bacteria can be harmful to your health, and you do not want any bacteria to infect your visitors or house members by using an unsterilized dish or utensil from the dishwasher. 

As a result, hot water can assist you in resolving the issue.

Nowadays, most dishwasher manufacturers recommend that you connect your dishwasher to a hot water supply.

Because dishwashers do not have a hot or cold cycle like washing machines, you will need to either provide hot water or build a water heater alongside your dishwasher for it to acquire the hot water it requires to function.

Why should you connect your dishwashers to hot or cold water?

Old dishwasher models still require to be connected to a hot water source. Here are some common reasons why you should connect your dishwasher to a hot water source:

Better cleaning opportunity:

Hot water is always recommended to clean any kind of objects like dishes and utensils. It helps to remove any kind of dirt and food residue easier. So, it is always recommended to connect your dishwasher to hot water.

Disinfected dishes:

Heat is a big enemy of various bacteria and pathogens. It terminates them instantly when your dish or utensil comes in contact with hot water. So dishwashers need to be connected to hot water lines.

Better heating feature:

Though most dishwashers have a heating coil inside, it is recommended to use hot water. The reason behind this is to reduce the time to heat the water.

The heating coil at the bottom of a dishwasher is not as powerful to heat water in the shortest possible time. So, heating water from cold may require time and will result in a longer operation time.

Therefore, dishwashers should be connected to hot water lines.

Reduces runtime saves your time:

If you use hot water, your dishwasher can clean your dirty dishes and utensils in one run and in the shortest time possible. Using hot water can clean your dishes much better than using cold water.

Therefore, it will take a very short time to clean which will eventually mean saving a lot of your time.

But recently, a modern dishwasher will instruct users to use cold water due to improvements in their features. Here are some significant reasons why you should connect your dishwasher to a cold water source if it is recommended by the manufacturer:

Powerful electric coil:

Time improves all machines. Therefore, dishwashers have improved a lot as well.

Modern dishwashers come with a powerful electric coil to heat water by themselves. So it is not required to connect your dishwasher to hot water lines. Thus, in this case, it is recommended by the manufacturers to use cold water.

Less hassle:

If you connect your dishwasher to hot water then you will have to check if your machine is getting the heated water that it requires. To ensure that, you may have to install a separate water heater machine which will require a separate space to set.

But using cold water is not a huge problem as at the end of the day, you will get your dishes and utensils clean.

Should these dishwashers connect to hot or cold feed?

Brands of Dishwashers Connect to Hot or Cold Feed
BoschConnect to cold feed
Bosch ExxcelConnect to cold feed
LGConnect to hot feed
MieleConnect to hot feed
WhirlpoolConnect to hot feed
SamsungConnect to cold feed
KenwoodConnect to hot feed
AEGConnect to cold feed
SiemensConnect to cold feed
SmegConnect to hot feed
BekoConnect to cold feed
IndesitConnect to cold feed
AskoConnect to hot feed
GEConnect to hot feed
NeffConnect to cold feed
ZanussiConnect to cold feed

Do dishwashers heat their own water or use hot water from the boiler?

Depending on the model and manufacturer, dishwashers heat their own water or use hot water from the boiler. It is common for the old dishwasher models to use hot water to properly clean dishes and utensils.

The dishwasher will require a connection with the boiler of your house to properly operate. This makes the dishwasher much more energy-saving.

But recently, some modern models and some manufacturers like Bosch, Bosch Exxcel, Samsung and mare more require a cold feed. These dishwashers have a powerful water heater, thus the dishwasher does not require direct hot water.

Therefore, it will require normal water which it will heat by itself.

Do all dishwashers need a hot water supply?

No, all dishwashers do not need a hot water supply. 

Although all dishwashers in the US use a direct connection with the boiler of the house for hot water for the machine, various companies suggest users use cold water instead as it can clean the dishes efficiently with their in-house technology developed by their R&D team.

These include various new technology for cleaning which clean dishes without using hot water. Some even use a self-heating coil which is powerful than other dishwashers.

This heating coil can heat water rapidly which emits the necessity of hot water. So, all dishwashers do not need a hot water supply.

Are modern dishwashers cold feed only?

No, modern dishwashers are not cold feed only. Modern dishwashers are designed with all the possible usages that they may encounter. One of them is users using hot water.

Most modern dishwashers are designed to operate with water with a temperature between 120o – 145o degrees Fahrenheit. Nowadays, it also requires hot feed only as it may have some features to compensate for the necessity of warm water.

But it is recommended to follow the rules provided by the manufacturer.

Some modern dishwashers require hot water feed for being eco-friendly. The use of hot water consumes less electricity which makes it eco-friendly. This is another significant reason why all modern dishwashers are not cold feed only.

Is it OK to connect the dishwasher to hot water? What happens if you connect a dishwasher to hot water?

Yes, it is OK to connect the dishwasher to hot water. Almost all dishwashers are required to be connected to a hot water feed for their general operation.

If the water temperature is within the dishwasher’s ideal range, it will clean the dishes properly.

The dishwasher will be connected to your house’s boiler via a hot water feed if you connect it to hot water. It will take in hot water, which it will use in its daily operations.

When turned on, it will utilize hot water to clean and sterilize dishes and utensils using a variety of cleaning agents.

How much hot water does a dishwasher use?

Depending on the size, model, and manufacturer of the dishwasher, it may use around 3 – 6 gallons of water per cycle. It is seen that old dishwasher use quite a quantity of water.

It uses around 8.5 – 15 gallons of water per load. Depending on the size of the dishwasher, it uses a specific amount of water. As a result, even if you don’t clean a lot of dishes, it will use a lot of water.

Modern dishwashers, on the other hand, use a particular quantity of water. It employs a variety of sensors to detect the need for water to clean the dishes.

It uses a certain amount of water after the detection. Modern dishwashers consume about 3 gallons of water on average, which is a significant reduction when compared to older ones.

Final thoughts

In the US it is common to connect dishwashers to the boiler of the house. Most dishwasher models require to use of hot water. But certain models require cold water feed in their dishwasher. Thus, depending on the model, dishwashers connect to hot or cold water.