Need more hot water for a growing family?
The OneWave OW300 Solar Water Heater combines a large 300-litre storage tank with 22 evacuated heat-pipe tubes to provide a more reliable and energy-efficient hot water supply for medium to large households.
Designed for up to 7 users, the OW300 is suitable for landed homes, double-storey houses, semi-detached properties and households with higher daily hot water demand.
Its pressurized, closed-loop system helps deliver consistent hot water while reducing dependence on conventional electric water heating.
When several family members shower one after another, a smaller water heater may struggle to maintain sufficient hot water.
Common household problems include:
A larger storage tank alone may not solve the problem. The solar collector capacity must also be suitable for the household’s actual daily hot water usage.
When the solar collector cannot generate enough heat, the backup heater may operate more frequently.
This may lead to:
Older or poorly designed solar water heater systems may also experience heat loss, corrosion or water leakage over time.
Choosing the right capacity and collector system is therefore important for long-term performance.
The OneWave OW300 is designed to support households with higher daily hot water requirements.
Its key features include:
The system uses solar energy as its primary heat source, with an integrated backup heater providing additional support when solar energy is insufficient.
The OneWave OW300 provides a 300-litre hot water storage capacity for medium to large families.
It is recommended for up to seven users, depending on:
A proper site and usage assessment is recommended before installation.
The OW300 is equipped with 22 evacuated heat-pipe collector tubes.
These tubes absorb solar energy and transfer the collected heat into the storage tank.
The larger solar collection area helps the system:
Each evacuated tube contains a conductive copper heat pipe.
The vacuum tube absorbs solar energy, while the copper heat pipe transfers that heat into the pressurized water heater tank.
Because household water does not flow directly through the collector tubes, the system offers several advantages:
The OneWave OW300 uses a closed-loop indirect heating system.
Household water does not flow directly through the evacuated collector tubes. Instead, solar heat is transferred into the storage tank through the heat-pipe system.
This design helps provide:
The OneWave OW300 has a manufacturer-stated pressurized tank rating of 850kPa.
This makes it suitable for households that require stronger and more consistent hot water flow.
Actual performance will depend on the property’s:
The existing plumbing system should be assessed before installation.
The OneWave OW300 uses a SUS304L stainless steel inner tank.
The tank construction includes:
This construction supports long-term durability and pressurized hot water storage.
A magnesium rod is installed to help protect the inner tank from corrosion.
The magnesium rod attracts corrosive elements that may otherwise affect the storage tank.
Regular inspection and replacement of the magnesium rod, when required, can help:
The storage tank uses 50mm high-density pressure-injected polyurethane foam insulation.
This insulation helps reduce heat loss and retain the stored water temperature for longer periods.
This means hot water collected during the day can remain available for evening or early morning use.
During rainy weather, extended cloudy conditions or unusually high hot water demand, the integrated backup heater can provide additional heating support.
The OneWave OW300 includes:
This helps maintain a more reliable hot water supply when solar energy is temporarily insufficient.
The OneWave OW300 is recommended for:
For households with up to nine users or heavier hot water demand, the OneWave OW300 Xtreme may be more suitable.
| Feature | OneWave OW300 | OneWave OW300 Xtreme |
|---|---|---|
| Tank capacity | 300L | 300L |
| Recommended users | Up to 7 users | Up to 9 users |
| Vacuum tube quantity | 22 tubes | 30 tubes |
| Stated collector efficiency | 90%–94% | 99% |
| Inner tank material | SUS304L | SUS316L |
| Empty weight | 108kg | 118kg |
| Full operating weight | 416kg | 426kg |
| Overall dimensions | 2400 × 2000 × 520mm | 2400 × 2000 × 520mm |
Choose the OneWave OW300 when:
Choose the OneWave OW300 Xtreme when:
| Specification | OneWave OW300 |
|---|---|
| Model | OW300 |
| Tank capacity | 300 litres |
| Overall dimensions | 2400 × 2000 × 520mm |
| Empty weight | 108kg |
| Full operating weight | 416kg |
| Recommended number of users | Up to 7 users |
| Pressurized | Yes |
| System construction | Sealing system |
| Specification | Details |
|---|---|
| Vacuum tube quantity | 22 tubes |
| Manufacturer-stated efficiency | 90%–94% |
| 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 |
| Accessories | Backup heater, non-return valves, thermostat and magnesium rods |
| Specification | Details |
|---|---|
| Inner tank diameter | Ø360mm |
| Inner tank material | SUS304L stainless steel |
| Heat exchange socket | SUS304L stamping moulding |
| Outer tank diameter | Ø460mm |
| Outer tank material | 304 stainless steel |
| Insulation material | 50mm high-density pressure-injected polyurethane foam |
| Tank protector | Magnesium rod |
| Temperature and pressure relief valve | 6 bar / 99°C |
| Water inlet and outlet | 3/4-inch stainless steel socket |
| Backup heater system | 3kW DN25 Incoloy 800 heating element |
| Solar controller | Water temperature reading and automatic backup heater |
| Heating configuration | Indirect system |
| Pressurized tank rating | 850kPa |
Yes. The OneWave OW300 is recommended for households with up to seven users.
Actual capacity depends on shower duration, hot water temperature, simultaneous usage and total daily consumption.
A 300L solar water heater can be suitable for a medium to large family when the collector capacity matches the household’s usage.
The OneWave OW300 combines a 300L tank with 22 evacuated heat-pipe tubes and is recommended for up to seven users.
Both models use a 300-litre tank.
The standard OW300 has:
The OW300 Xtreme has:
The OneWave OW300 includes a 3kW backup heating element.
When solar energy is insufficient, the controller can activate the backup heater to support the required water temperature.
Yes.
The OneWave OW300 is a pressurized solar water heater with a manufacturer-stated tank pressure rating of 850kPa.
The property’s incoming water pressure and plumbing condition should still be checked before installation.
The system uses independent heat-pipe evacuated tubes.
Household water does not flow directly through the collector tubes. Therefore, a damaged collector tube is less likely to cause water loss from the storage tank.
The damaged tube should still be inspected and replaced by a qualified technician.
Yes.
The system includes a 3kW DN25 Incoloy 800 backup heating element to provide additional heating support when solar energy is insufficient.
Not every roof is automatically suitable.
Installation depends on:
The OW300 has a full operating weight of approximately 416kg, so the roof and mounting area should be assessed before installation.
Able Fix provides solar water heater consultation and installation support across selected locations in:
Our solar water heater support may include:
Proper system sizing and installation are important for achieving reliable hot water performance.
Upgrade to the OneWave OW300 Solar Water Heater for greater storage capacity, pressurized hot water and dependable daily performance for up to seven users.
Contact Able Fix for product consultation, installation assessment and model recommendations.
+60 12-213 1549
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+60 16-242 1549
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Service Area: Selangor, Kuala Lumpur and selected Klang Valley locations.
Product suitability depends on actual household usage, roof condition, water pressure, plumbing configuration and installation environment. Specifications are subject to the manufacturer’s latest confirmation.
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