In the greater Taipei area, many people live in penthouses, mid- to high-rise apartments, or on the top floors of community buildings. In these houses, due to the insufficient vertical height difference from the water tower on the top floor, the gravity of the falling tap water is limited, resulting in generally low water pressure. At this time, the "Booster Pump" has become an indispensable device for every home. However, many homeowners often encounter two annoying problems: first, the pressurized motor keeps humming on the balcony or attic when no one is using water at home, even causing complaints from neighbors; second, when taking a shower, the water temperature always alternates between hot and cold, making washing extremely painful. These two issues are actually related to each other. This article will explain in detail the self-repair steps for motor failure, the selection indicators of mainstream motors, and the replacement market of Shuangbei.
The pressurizing motor keeps turning? Self-examination of three common fault points
When you turn off all the faucets in your home, but find that the pressurizing motor continues to run, or "beats and beats" every few minutes, this means that the motor is "abnormally compensating pressure." Please check the following three reasons in order:
1. Micro leakage in the pipeline (the most common): The motor starts because it detects a drop in pressure in the pipeline. If the toilet tank's water-stopping skin is aged (this is usually a small leak that is difficult to detect with the naked eye), the faucet gasket is worn, or there is a micro-leak in the water heater pipe, the slow loss of water flow will cause the motor to frequently replenish pressure. You can first close the water inlet valve under the toilet. If the motor stops running immediately, it is confirmed that the toilet is leaking.
2. The check valve is jammed or worn: The pressurized motor is equipped with a check valve to prevent water from flowing back. If water is occasionally cut off and then restored in the greater Taipei area, sediment in the pipeline may get stuck in the check valve, causing the pressure in the pipeline to flow back to the water tower, and the motor will continue to run because it cannot sense the pressure.
3. Pressure switch aging failure: The pressure switch is the brain that controls the opening and closing of the motor. When used for a long time, the internal spring metal is fatigued or the contacts are ablated, and the motor cannot cut off the power when the set pressure is reached. At this time, the motor will continue to run. If not handled in time, the motor will soon overheat and burn.
I feel hot and cold in the shower, is it the pressurized motor that is causing the problem?
Many people’s first reaction when bathing water is hot and cold is that the water heater is broken. However, after plumbers come to the site for inspection, they often find that the problem lies in the pressurized motor. Traditional pressurized motors (such as the old mechanical motors of Mikawa and TECO) are controlled by "pressure switches". When you turn on the hot water, the pressure in the pipeline drops and the motor starts to pressurize; when the water pressure reaches the upper limit, the motor will stop immediately. This "on-off-on-off" operating mode causes the water pressure to fluctuate like a wave. When the water pressure becomes low, the amount of water flowing into the gas water heater is insufficient, and the water heater will safely shut down; when the motor starts again, the water pressure rises, and the water heater ignites again. This is the physical reason why the bath water temperature is extremely unstable. To solve this problem, you must switch to an electronic voltage-stabilized motor or a variable frequency motor that can provide stable water flow.
Competition of three mainstream pressurizing motors: traditional, electronic and variable frequency
When considering replacing motors, these three common types on the market have completely different performance and prices:
1. Traditional mechanical pressurizing motor:The most affordable price, simple and durable structure. But the disadvantage is that it makes a lot of noise (like a tank passing by) and the water pressure fluctuates significantly. In addition, it does not have a "water shortage protection" mechanism. Once the water is cut off, the motor will continue to idle until it burns out. Suitable for installation in an open space on the top floor away from home and not afraid of noise.
2. Electronic voltage-stabilized pressurized motor: Currently the mainstream in home installation. It combines a pressure switch and a flow sensor (Flow Switch). As long as there is water flowing, the motor will continue to run. The water output is very smooth, and the bath no longer gets hot and cold. The operating sound is about half that of a traditional motor, and it is equipped with automatic shutdown protection due to water shortage to avoid idling and burning.
3. Variable frequency constant voltage pressurizing motor: The top choice. There is a frequency converter inside, which can intelligently adjust the motor speed according to the number of faucets you open. When turning on one faucet, it will turn slowly and when turning on multiple faucets, it will turn faster. The water pressure will always remain constant. It is the quietest (very quiet operating sound) and most energy-saving type. It is very suitable for families with high quality of life requirements and multiple water needs at the same time.
Reasonable budget for installation and replacement of pressurized motors in Shuangbei area
In the greater Taipei area, the cost of replacing pressurized motors usually includes "motor host (usually 1/4HP or 1/2HP)" and "water and electricity wages (including removal and removal of old motors, new motor wiring and water pipe modifications)". The reasonable market price is as follows:
* The price for continuous work and materials is about NT$ 3,800 to NT$ 5,000.
* The cost of continuous belt material is about NT$ 4,800 to NT$ 7,500 (plastic steel material can prevent the motor from corroding and discharging rust water, so it is recommended).
* The cost of the whole package is about NT$ 9,500 to NT$ 15,000.
[Installation Notes]
1. : If the motor is installed in the open air on the top floor, be sure to ask the master to install a special plastic waterproof rain cover (about NT$ 300-500), which can greatly extend the life of electronic components and motors.
2. : It is required to put a thick rubber shock absorber pad on the bottom of the motor, which can effectively reduce the low-frequency noise generated by resonance with the cement floor during operation and avoid neighborhood disputes.
3. : Major brands (such as Muchuan, Huale, and Dajing) usually provide a 1 to 2-year warranty for the host. When signing a contract, be sure to confirm the warranty terms and the construction warranty period of the water and electricity company.
The latest standards for catching leaks and regulatory responsibilities in Shuangbei collective housing (2025-2026 practice)
According to Article 10 of the "Apartment Building Management Regulations" of the Ministry of the Interior and the trend of civil water leakage judgments in Shuangbei District Court in recent years, most water leakage disputes in old collective housing focus on the identification and definition of "exclusive parts" and "common parts". The roof platform and the public pipes are jointly owned by all separate owners, and the repair costs should be shared by public funds or all residents in proportion to their shares according to law; if the water supply and drainage pipes inside the floor slabs on the upper and lower floors are damaged, the pipes will be borne exclusively by the users or shared by the upper and lower floors.
At the engineering and technical level, modern professional leak detection has fully introduced non-destructive scientific testing, including "FLIR high-resolution infrared thermal imaging camera" (locating temperature difference leakage paths), "high frequency moisture meter" (measuring the moisture content of deep structures) and "pipeline air pressure and water pressure pressure test" (determining whether hot and cold water pipes are leaking). During construction, do not directly apply elastic cement or oil-based paint on the wet cement layer to seal it. Otherwise, the thermal expansion of internal water vapor will quickly cause the coating to blister and peel off, resulting in more serious powdery wall cancer. The standard construction method must first completely eliminate the water source, wait until the moisture content of the cement structure drops below 8%, and then apply the negative pressure resistant silicic acid permeability crystallized waterproof layer.
Recommendations on independent certificate storage and compensation process for water leakage repair
- Take photos and videos as evidence immediately: Use rulers to record the leakage range, frequency of water discharge, direction of water mark diffusion, and keep time stamps.
- Written notification and coordination survey: Officially notify the neighbors through the management committee or a certified letter, and agree on a professional third-party leak detection and appraisal unit recognized by both parties to conduct an on-site survey.
- The contract states the warranty terms: When signing the contract for the project, be sure to clearly specify the waterproofing warranty period (usually 1 year for partial repairs, and 2 to 5 years for the whole room or roof re-construction), and specify the water test acceptance criteria (such as a 48-hour water storage test in the bathroom shower area) to protect your own asset rights.
