How Do Tankless Toilets Function?

tankless toiletThe standard tank and bowl toilets most seen in many older homes are now in full competition with the tank less models thanks to newer and better designs. Even though the tankless toilet is more expensive, it provides for a more powerful flush than the majority of toilets in the home today that rely on gravity and the siphoning action.


Gravity is the main factor in the tank and bowl models seen in many older homes today. The water from the tank is release via the valve cover being lifted from the drain as the handle is pressed. The water rushes from the tank into the bowl which fills the bowl siphon creating the vacuum action that dispels the waste and water into the connecting sewage lines. Tankless toilets use a totally new technology of pressure to force the water into the bowl removing the waste into the connecting sewage lines. Tankless toilets have taken on a new shape and look due to the fact that they do not hold water and that the main water line is plumbed directly into the model. A small motorized pump activates the water entering the toilet and replaces the necessity of filling the tank with only the water needed to eliminate waste and fill the bowl.

Installation Tips

Although installation specifications provide the use of a one-half inch pipe, some of the newer tankless toilets require a larger pipe. Tankless toilets do not store water so they do not need to rely on gravity to pull water into the toilet. If your water pressure is low, there is a possibility the tankless model will continue to flush until enough water is used to complete the process. Installing the tankless model using a one inch pipe will avoid this problem.

A tankless toilet refills very quickly after flushing. The pressure for flushing is generated through an electrical pump. To flush a tankless toilet, you push a button that triggers the pump. The pump is inside the bowl. You can choose from a model that has the water supply lines through the floor or in the wall behind the toilet. Some models offer a single pipe located in the back of the toilet that goes into the wall. When using an industrial tankless toilet, the plumbing goes up from the back of the bowl and connects to a "T" shaped pipe.


Since the tankless models do not require water filling into a tank, there is less chance of water leaking from the tank through the drain seal into the bowl. Since most tankless models are one unit, cleaning is more streamlined and there are fewer sanitation issues. The best advantages of a tankless toilet is that it saves space and water. This model only uses approximately 1.6 gallons of water per flush.


With tankless models, the water supply lines may need to be replace or reconfigured to accommodate installation. This could result in costing more for installation, but well worth the savings in the long run. However, when using the tankless model in new construction, it can be planned into the design and the water supply lines installed accordingly. Since these models function without a tank and are powered by electricity, loss of power will render the fixture inoperative and that creates concern for many consumers.

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