Washdown toilets vs Siphon toilets: a comprehensive comparison and selection guide
Time:
2025-03-25
Washdown toilets use gravity for strong flushing but are noisier and less odor-resistant. Siphon toilets rely on fluid dynamics for quieter, cleaner flushing but consume more water. Each type suits different scenarios: washdown for older homes or heavy waste, siphon for modern homes or quiet environments. Emerging technologies combine both advantages for better performance.
Washdown toilets vs Siphon toilets: a comprehensive comparison and selection guide
In the choice of household bathroom products, the flushing mode of the toilet is directly related to the daily use experience. As the two main technical routes, the direct flushing type and the siphon type have distinct technical characteristics. This paper starts from the working principle, combined with the use of the scenario for multi-dimensional comparison, to provide consumers with objective reference for purchasing.
1. Comparison of core working principles
Washdown toilet
Using the principle of gravity scour, vertical water flow is formed through the potential energy of the high water of the tank, which directly impacts the inner wall of the toilet and the sewage outlet. The water flow path is linear, the diameter of the sewage pipe is generally 9-10 cm, and the water flow inertia is used to complete the sewage.
Siphon toilet
Based on the siphon effect in fluid mechanics, through the special design of the "S" type water trap pipe, the negative pressure difference is formed during flushing, which makes the water flow produce whirlpool suction. When the water level reaches the highest point in the pipe, it forms a siphon that draws the dirt into the drain.
2. Comparative analysis of performance indicators
Washdown toilet | Siphon toilet | |
Flushing efficiency | Strong water flow impact (up to 12-15L/min), suitable for handling large solids | Whirlpool water covers the whole area and is cleaner to sticky stains |
Water-saving performance | Single flush water 6-9L, high utilization of water resources | It requires 8-13L water to maintain the siphon, and the water consumption is large |
Silence level | Flush noise 70-75 dB | Operating noise is controlled below 50 decibels |
Odor-proof ability | The water storage area is about 150cm² | The water storage area of S-bend is 300cm² |
Pipeline adaptability | Sewage pipe diameter compatibility is strong, suitable for the old community | 110mm standard sewage pipe is required |
Maintenance cost | No complex structure, low dredging cost | S-type pipes are easily contaminated and need regular deep cleaning |
3 .Scenario-based purchase suggestions
A direct flush is recommended
Old houses with insufficient water pressure (water pressure ≥0.05MPa)
The drainpipe is displaced or installed in a non-standard way
Budget is limited and maintenance is important
Scenarios where heavy solid waste needs to be flushed frequently
Siphon cases are recommended
Bedroom bathroom with high silence requirement
A closed space that pays attention to the air quality of the bathroom
Standard plumbing for modern new homes
The pursuit of enamel comprehensive clean consumer groups
4. Technological development trend
The current market shows a trend of functional integration, and some new products combine the advantages of the two technologies:
Supercharged direct injection: Increase water speed (up to 20L/min) through air pressure device
Super vortex siphon type: The design of double diversion holes forms 360° annular water flow
Intelligent water-saving system: equipped with sensors to achieve 3L/6L two-speed flushing mode
Summary:
The direct impact type is known for its simple structure and strong adaptability, while the siphon type is clean and comfortable to use. Consumers should choose according to the actual needs of housing structure and use habits. Under the promotion of water-saving and environmental protection policies, both types of products are continuously optimizing the flushing efficiency, and the future technical boundary may be further blurred to form a more efficient comprehensive solution.
Related information
Chaozhou Baisheng Technology Co., Ltd
Tel: 86-15876856111
Email: christy@baisheng-cn.com
cloud@baisheng-cn.com
Address: Company near Qiaoxia, Dacheng Village, Fengtang Town, Chao'an District, Chaozhou City
Mobile Site
Copyright © Chaozhou Baisheng Technology Co., Ltd
