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Heater solar water 2
High-quality, cost-effective evacuated tube non-pressurized solar water heater with PVDF galvanized steel outer tank, three-target vacuum tubes, optional assistant tank, and TK-8A/TK-7 controller. Reliable solar water heating with warranty.
| Item No. | Qty /【pcs】 | Size /【mm】 | 【M2】 | 【M2】 | 【L】 | 【Sets】 |
| Optima-100L | 10.00 | Φ58 X 1800 | 0.94 | 1.33 | 100.00 | 180.00 |
| Optima-120L | 12.00 | Φ58 X 1800 | 1.13 | 1.60 | 120.00 | 150.00 |
| Optima-150L | 15.00 | Φ58 X 1800 | 1.41 | 2.00 | 150.00 | 120.00 |
| Optima-180L | 18.00 | Φ58 X 1800 | 1.68 | 2.39 | 180.00 | 100.00 |
| Optima-200L | 20.00 | Φ58 X 1800 | 1.87 | 2.66 | 200.00 | 90.00 |
| Optima-240L | 24.00 | Φ58 X 1800 | 2.25 | 3.19 | 240.00 | 75.00 |
| Optima-300L | 30.00 | Φ58 X 1800 | 2.81 | 3.99 | 300.00 | 60.00 |
| Optima-360L | 36.00 | Φ58 X 1800 | 3.37 | 4.79 | 360.00 | 50.00 |
| Galvanized Steel Solar Water Heater-Water Tank | ||
| 1 | Material of out tank | Zinc coated galvanized steel (PVDF)/SUS-201 Stainless Steel. |
| 2 | Material of inner tank | Food grade stainless steel SUS304-2B,0.4/0.5mm thickness |
| 3 | Tank insulating layer | 55mm , high-density polyurethane foam |
| 4 | Inlet and outlet hole | 1/2’’,3/4’’ |
| 5 | Tube to tube distance | 80mm |
| 6 | Tank size | 460/360mm or 470/360mm |
| 7 | Welding: | Argon arc welding |
| Galvanized Steel Solar Water Heater-Vacuum Tubes | ||
| 8 | Tube structure | All-glass double deck co-axial structure |
| 9 | Glass material | High borosilicate 3.3 glass |
| 10 | Outer tube dia. and glass thickness | Ø58±0.7mm; Glass thickness 1.6±0.15mm |
| 11 | Inner tube dia. and glass thickness | Ø47±0.7mm; Glass thickness 1.6±0.15mm |
| 12 | Tube size | 58*1800mm |
| 13 | Structure | Cu/SS-ALN(H)/SS-ALN(L)/ALN |
| 14 | Sediment method | Three targets magnetron sputtering plating |
| 15 | Specific absorption | 0.93-0.96(AM1.5) |
| 16 | Emission ratio | 0.04-0.06(80℃±5℃) |
| 17 | Vacuum tightness | 5.0×10¯³ Pa |
| 18 | Idle sunning property parameters | 260-300 m².C/KW |
| 19 | Average heat loss coefficient | ULT=0.4~0.6W/(M2.0C) |
| 20 | Resistant Hail | ≤35mm |
| 21 | Useful life | 15 years |
| Galvanized Steel Solar Water Heater-Bracket | ||
| 22 | Bracket: | Coated Stronger galvanized steel-1.5mm |
| 23 | Bracket angle: | 25 degree flat roof |
| 24 | Fastening pieces: | Stainless steel. |
● Inner tank: stainless steel SUS304-0.4/0.5mm
● Vacuum tube: Cu/SS-ALN(H)/SS-ALN(L)/ALN 58-1800mm
● Outer tank shell: Zinc coated galvanized steel (PVDF)
● Insulation: high density polyurethane,55mm
● Frame: coated galvanized steel-1.5mm
● Use the sun to warm your water. Save up to $579 per year!!
This low-pressure RIWATT solar water heater uses 58×1800 mm evacuated tubes to absorb sunlight and convert it into heat.
Through natural thermo-syphon circulation, heated water rises into the stainless-steel inner tank, while cooler water flows back into the tubes for continuous heating.
The galvanized steel outer shell protects the system from corrosion, ensuring long outdoor durability.
As a gravity-feed solar water heating system, it delivers stable hot water without pressure load, providing efficient, safe, and cost-effective hot water solar heat for homes.
Basically, non-pressurized solar water heaters have two main types of cold water loading methods:
A small tank (3 L, 5 L, or 15 L), typically side-mounted or top-mounted on the main water tank. Its primary function is to refill the main tank with cold water. When hot water is drawn, the assistant tank ensures that cold water is gradually added, preventing the main tank from running dry.
An electronic control unit that monitors water temperature and water level via built-in sensors. It can automatically operate solenoid valves, pumps, or electric heating elements to manage cold water loading, trigger backup heating when needed, and maintain safe operation by preventing dry-heating, over-temperature, and potential leaks.
There are also cost-effective cold water load ball valves available in the market, which we plan to introduce in the future.
Today, we will focus on the functions of the assistant tank and solar controller, specifically how they supply cold water to the main tank.
● Apartments
● Houses
● Villas
● Small residences
● Hotel rooms
● Guest houses / lodges
● Business buildings
● Staff dormitories
● Showers and baths
● Kitchen dishwashers
● Washing machines
● Hot spas and jacuzzis
● Swimming pools
● Salon / beauty shop hot-water supply
● Small commercial hot-water applications
● Increase capacity in series: higher temperature output
● Increase capacity in parallel: larger volume for multiple users
● Flexible configuration for both home and commercial RIWATT solar water heating systems
The solar heater adapts to all your needs for an apartment, a house or residential or hotel project. It is a product suited for everyone
Thanks to vacuum tubes, UV rays are captured, and the water heats up more quickly, even in rainy days
In addition to the vacuum sensors that act as a thermos, the tank is made of sustainable insulated high density polyurethane
With its installation manual all in pictures, and its installation video, the riwatt Solar Water Heater is ready to be used in 45 minutes
With over 20000 water heaters sold worldwide our brand and our products are a symbol of confidence
A non-pressure solar water heater uses vacuum tubes to absorb sunlight and convert it into heat. The hot water naturally rises into the storage tank through thermosiphon circulation — no pump or electricity required. It’s ideal for households seeking an affordable and energy-saving hot water solution.
The main difference lies in water pressure. A pressurized solar heater maintains constant water pressure for showers, while a non-pressure system relies on gravity flow, making it simpler, cheaper, and easier to maintain.
Vacuum tube heaters perform better in colder or cloudy climates due to superior heat retention. Flat plate heaters, on the other hand, are more suitable for warm regions and have a longer lifespan in hard water areas.
It uses free solar energy, significantly reducing electricity bills. Unlike electric water heaters, it doesn’t risk electrical shock or overheating, and it operates even during power outages.
Gas water heaters require constant fuel supply and emit carbon gases. A non-pressure solar heater is eco-friendly, cost-saving, and nearly maintenance-free, making it a greener long-term choice.
Yes, the vacuum tubes retain heat efficiently, and the system can be equipped with an optional electric backup heater to ensure continuous hot water even in cloudy or rainy weather.
If you want a low-cost, reliable system for family daily use, choose non-pressure vacuum tube type.
If you need high water pressure and modern performance, choose pressurized heat pipe model.
If your area has high solar radiation and stable climate, a flat plate solar heater may be more suitable.
Most cleaning can be done by users. However, for severe scaling or leaking tubes, professional service is recommended to protect the system.
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