Running out of hot water during the morning rush?
The OneWave OW300 Xtreme Solar Water Heater combines a large 300-litre storage tank with 30 high-performance evacuated heat-pipe tubes, providing a stronger and more consistent hot water supply for large households.
Designed for up to 9 users, it is suitable for larger landed homes, bungalows and properties with higher daily hot water demand.
A large storage tank alone does not guarantee fast heating or sufficient hot water.
When a solar water heater has limited collector capacity, the system may take longer to recover after several people shower consecutively. This can result in:
For households with seven to nine users, choosing the correct number of solar collector tubes is just as important as choosing the tank capacity.
Imagine several family members preparing for work or school at the same time.
When the solar collector cannot generate heat quickly enough, later users may experience lower water temperatures. The electric backup heater may then operate more frequently, reducing the overall energy-saving benefit of the solar water heating system.
Older open-loop systems may also be more exposed to corrosion, water leakage and heat loss over time.
This is why a high-demand household requires a solar water heater designed with stronger heat collection, reliable tank protection and proper pressure handling.
The OneWave OW300 Xtreme is engineered for households that require more hot water without immediately moving to a commercial system.
It features:
300-litre storage capacityThe additional collector tubes help the system capture more solar energy and improve heat recovery for higher daily usage.
The OW300 Xtreme is equipped with 30 evacuated heat-pipe tubes, compared with 22 tubes on the standard OW300 model.
More collector tubes provide a larger solar collection area, helping the system produce and recover hot water more effectively for larger households.
With a 300-litre tank and increased collector capacity, the OW300 Xtreme is recommended for households of up to nine users.
Actual performance may vary depending on:
A site and usage assessment is recommended before installation.
Because domestic water does not flow directly through the heat-pipe tube, a damaged individual tube is less likely to cause water leakage from the storage tank.
This independent tube operation also makes future maintenance more manageable.
The OW300 Xtreme uses a closed-loop indirect system.
Instead of allowing household water to flow through the solar collector tubes, solar heat is transferred into the storage tank through the heat-pipe and heat-exchange components.
Key advantages include:
The OW300 Xtreme uses a SUS316L stainless steel inner tank, offering improved corrosion resistance for long-term hot water storage.
A magnesium rod provides additional active protection by attracting corrosive elements before they affect the tank body.
This helps extend the service life of the solar water heater when the system is properly maintained.
The storage tank is insulated with 50mm high-density pressure-injected polyurethane foam.
This insulation reduces overnight heat loss and helps retain the stored water temperature for longer periods, allowing more hot water to remain available when needed.
With an 850kPa pressurized tank rating, the OW300 Xtreme is designed to support pressurized household plumbing systems.
This makes it suitable for homes that require stronger and more consistent hot water flow at showers and water outlets, subject to the property’s existing water pressure and plumbing design.
During rainy weather, extended cloudy periods or unusually high hot water usage, the integrated 3kW Incoloy 800 backup heating element can provide additional heating support.
The solar controller provides:
This allows the property to continue receiving hot water even when solar energy is temporarily insufficient.
| Feature | OW300 | OW300 Xtreme |
|---|---|---|
| Tank capacity | 300 litres | 300 litres |
| Recommended users | Up to 7 users | Up to 9 users |
| Evacuated tubes | 22 tubes | 30 tubes |
| Stated collector efficiency | 90%–94% | 99% |
| Inner tank material | SUS304L | SUS316L |
| Empty weight | 108kg | 118kg |
| Full operating weight | 416kg | 426kg |
The OW300 Xtreme is the better option for households that require higher heat collection and faster recovery while maintaining the same 300-litre tank capacity.
For commercial buildings, hotels or properties with continuous hot water demand, a commercial heat-pump or central hot water system may be more suitable.
General Specifications
| Specification | OW300 Xtreme |
|---|---|
| Model | OneWave OW300 Xtreme |
| Tank capacity | 300 litres |
| Overall dimensions | 2400 × 2000 × 520mm |
| Empty weight | 118kg |
| Full operating weight | 426kg |
| Recommended number of users | Up to 9 users |
| Pressurized system | Yes |
| System construction | Sealing system |
| Specification | Details |
|---|---|
| Vacuum tube quantity | 30 tubes |
| Stated efficiency | 99% |
| Tube material | Two-layer borosilicate glass, 1.6mm |
| Collector system | Closed-loop system |
| Tube length | 1900mm |
| Outer tube diameter | 58mm |
| Inner tube diameter | 47mm |
| Tube coating | SS-CU-ALN/AIN absorptive coating |
| Heat pipe | Ø8mm TU1 copper |
| Included accessories | Backup heater, non-return valves, thermostat and magnesium rods |
| Specification | Details |
|---|---|
| Inner tank diameter | Ø360mm |
| Inner tank material | SUS316L stainless steel |
| Heat exchange socket | SUS316L stamping moulding |
| Outer tank diameter | Ø460mm |
| Outer tank material | 304 stainless steel |
| Insulation | 50mm high-density pressure-injected polyurethane foam |
| Tank protection | Magnesium rod |
| Temperature and pressure relief valve | 6 bar / 99°C |
| Water inlet and outlet | 3/4-inch stainless steel socket |
| Backup heating system | 3kW DN25 Incoloy 800 heating element |
| Solar controller | Temperature reading and automatic backup heater |
| Heating configuration | Indirect system |
| Pressurized tank rating | 850kPa |
Yes. The manufacturer recommends the OW300 Xtreme for up to nine users. However, actual capacity depends on shower duration, the number of simultaneous users and daily hot water consumption.
A 300-litre solar water heater is generally suitable for a larger household when supported by sufficient solar collector capacity. The OW300 Xtreme uses 30 heat-pipe tubes to provide stronger solar heat collection than the standard OW300 model.
The system includes a 3kW automatic backup heater. When solar energy is insufficient, the controller can activate backup heating to maintain the required water temperature.
The OW300 Xtreme uses an independent heat-pipe and closed-loop design. Household water does not flow directly through the evacuated heat-pipe tubes, significantly reducing the risk of water leakage if an individual tube is damaged.
The affected tube should still be replaced by a qualified technician.
Installation depends on:
The OW300 Xtreme has a full operating weight of approximately 426kg, so roof suitability must be assessed before installation.
Able Fix provides solar water heater consultation, installation and support around Selangor, Kuala Lumpur, Nilai and Seremban
Site availability is subject to location and installation requirements.
A solar water heater must be correctly sized and installed to deliver reliable results.
Able Fix can assist with:
Do not wait until your existing water heater can no longer meet your family’s daily demand.
Choose the OneWave OW300 Xtreme for greater collector capacity, pressurized hot water and reliable performance for up to nine users.
Contact Able Fix for product consultation and installation assessment.
WhatsApp Sales: +60 12-213 1549
WhatsApp Enquiry: +60 16-242 1549
Service Area: Selangor, Kuala Lumpur, Nilai & Seremban.
Product suitability depends on actual usage, water pressure, roof condition and installation environment. Specifications are subject to the manufacturer’s latest confirmation.
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