Central System Water Heater

With over 20 years of experience in distributing and manufacturing water heating systems in Hong Kong, German Pool brings in engineering technology from Germany and develops the renowned GPU Series. GPU water heaters conform to the Standards of International Electrotechnical Commission (IEC Standards) and comply with international safety standards and waterworks regulations.

Certified with 2025 New Grade 1 Energy Efficiency Label

All-new German Pool Storage Water Heaters have undergone revolutionary optimization upgrade; with high efficiency heating system and injected polyurethane foam insulation layer, water stays hot for an extended period of time, reducing heat loss to a minimum and saving energy to the maximum. Certified with the more astringent EMSD 2025 New Grade 1 Energy Label, under the new grading system, the reference number on the label will be prefixed with [U3-] for easy identification, ensuring absolute energy-saving efficiency.

Excellent Performance with Incredible Durability

Heavy Gauge Stainless Steel Inner Tank

The Japanese heavy gauge stainless steel inner tank ensures an operation free of rust, corrosion, deformity and leakage.

High Thermal Efficiency

The prime quality stainless steel heating element with built-in thermal cut-out ensures maximum thermal efficiency and safety.

Stable Temperature

The quality thermostat provides automatic temperature control to ensure constant water temperature and save energy. Temperature can be set to as high as 75°C.

Constant Water Pressure

The operation is not affected by water pressure. Hot water can be provided as long as there is a supply of cold water.

Water & Energy Saving Aerated Showerhead(1)

Tailor-made for Rapid Fast Flow Electric Water Heaters, the new water-saving aerator showerhead slashes up to 70% of the water consumed by a traditional 6-gallon water heater. The innovative Air Jet Compression Technology increases water discharge to a rate that is comparable to a massaging jet (8L/min), resulting in a lasting showering experience without compromising showering comfort.
Notes (1)

Unique Aerator Switch

Air is drawn through the air hole to increase water pressure, bringing you the most comfortable showering experience with reduced water consumption.

Air Jet Compression Technology

The innovative Air Jet Compression Technology delivers showering comfort comparable to a massaging jet at 8L/min.

Adjustable Showerhead Holder

The flexible holder can be adjusted in different angles, allowing easy placement.

First in Hong Kong

25-Year Warranty

All GPU series water heaters come with a quality passport with 25-year(2) warranty for the inner tank and 1-year warranty for electrical parts.

Notes (2)

Economical & Energy Saving

Pollution Free

The water heater produces no gas pollutants during the water heating process. Its operation is absolutely free of toxic substances and colour.

Energy Saving

The injected polyurethane foam provides maximum insulation to the water tank. Also, GPU water heaters are compliant with the “Grade 1 Energy Efficient Label” (specified models only).

Safe & Reliable

To prevent electricity leakage, the water heater comes with an earthing system and all electrical parts are insulated. The drip-proof and splash-proof design also ensure safety.

5-Tier Fail-Safe Features

  • 1
    Automatic Thermostatic Control
    Temperature can be adjusted according to user’s preference. When the upper limit is reached, electricity would be cut off automatically; once the water temperature drops below the lower limit, power will be resumed.
  • 2
    Thermal Circuit Breaker
    If the water temperature reaches 90°C, power would be cut off automatically to ensure safety.
  • 3
    Temperature Relief Valve
    When the water temperature reaches 90°C, the temperature relief valve will open automatically to prevent the buildup of steam pressure caused by continuous heating in the inner tank.
  • 4
    Pressure Relief Valve
    Under abnormal circumstances where the inner tank is subject to excessive pressure (more than 1,000kPa (10 bar)), the pressure relief valve will open automatically to discharge water.
  • 5
    Anti-back Syphon Device
    Hot water is prevented from being syphoned back to the supply pipe during water shortage. This effectively prevents inner tank damages and dry-heating.

Quality Accessories

Premium Stainless Steel Inner Tank

The Japanese heavy gauge stainless steel inner tank ensures an operation free of rust, corrosion, deformity and leakage.

Quality Heating Element

The prime quality stainless steel heating element with built-in thermal cut-out ensures maximum thermal efficiency and safety.

Effective Insulation

Optimal heat insulation is achieved by injected polyurethane foam.

Anti-Back Syphon Device

Hot water is prevented from being syphoned back to the supply pipe during the water storage period.

Pressure and Temperature Relief Valve (P.T.V.)

Temperature relief at/over 90°C and pressure relief at/over 1,000kPa.

2-in-1 Thermostat & Thermal Circuit Breaker

Automatic temperature control is provided to save energy. The circuit breaker is set at a maximum temperature of 82°C. The 2-in-1 design makes the device compact and durable.

Water Heater – Storage Video

Specifications
Information
Functions & Features
WiFi Connection
Others
Warranty Term
1-Year Warranty (Whole Unit)
Warranty Term (Additional)
25 Years on Inner Tank*
Remarks
* The inner tank warranty only applies to the replacement of inner tanks of storage water heaters. Additional service charges on testing, transportation and labour may apply. The 25-year inner tank warranty service is only applicable to products with a purchase date on or after 1 March 2026, as stated on the invoice or official receipt.

More Details

Brochure
Download
Manual
Download
Printable Page
Print

FAQ

There is leakage from my Storage Water Heater (Central System). How to fix it?
Check the location of leakage. Click Know More for repair advice.
There is no hot water supply from the shower head but the tap of wash-basin does, or vise versa. How
If the indicator light is on (meaning heater is under normal operation), check whether the tap or pipe is blocked or damaged. Customer should contact a professional for an inspection and repairs.
Why is my Storage Water Heater – Central (GPU series) not producing any cold water but only hot water?
The Storage Water Heater is not out of order. Cold water does not go through the inside of the heater. There is no cold water mostly becausethe tap is broken or the hose is clogged. Contact the Repairs & Customer Service Centre for inspection and repair.
There is no hot water supply. What should I do?
Check if the electric box and Power Switch (Cooker Switch) are operating normally.
When should I install the Pressure Reducing Valve?
The installation of Pressure Reducing Valve is suggested when water pressure is higher than 72.5 pounds.
How to make my water heater last longer?
Avoid boiling water without interval. Adjust the Thermostat to 2 1/2. To stabilize water pressure, pressure regulator can be installed if the water pressure is higher than normal.
Why is the Storage Water Heater – Central (GPU series) noisy?
The water heater is noisy due to gasification. Release hot water inside the heater to force out the air.Procedures:1. Turn off the power supply2. Release the hot water3. Turn off the tap after half a minute/1 minute 4. Repeat the process thrice or more
My water heater works perfectly during summer time. However, when winter comes or whenever the tempe
We normally want our running water to be hotter during cold weather. Higher water temperature implies more electric power is needed.
Why is there water dripping from the red device on the side of my GPU Water Heater?
This red device, known as Pressure & Temperature Relief Valve (PTV), is a device used to release heat and pressure contained within the water tank. When steam passes through the PTV, it'll condense and become water drops as the temperature there is lower.
Why the water comes out cold and hot from my Storage Water Heater (Central System)?
1. Abnormal pressure of incoming water.2. Other water outlet(s) in the house is(are) open and competing for water.
MORE FAQ

Note:

(1) Free only applicable to water heaters with capacity of 15 gal. or below

(2) The inner tank warranty only applies to the replacement of inner tanks of storage water heaters. Additional service charges on testing, transportation and labour may apply.