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Heater solar water 2
Non-Pressure Stainless Steel Solar Water Heater Reliable hot water anytime for homes, apartments, and hotels. Using high-efficiency vacuum tubes, it heats water quickly — even on cloudy days. The insulated tank keeps water hot for up to three days. A durable and sustainable solution for everyday use.
Non-pressure Stainless Steel Solar Water Heater is a smart solution for homes and apartments,
providing reliable hot water every day…
| Model: | Solar Vacuum Tube | Aperture Area | Gross Area | Capacity | 40’HQ Loading | |
| Item No. | Qty /【pcs】 | Size /【mm】 | 【M2】 | 【M2】 | 【L】 | 【Sets】 |
| 100L-Prime | 10 | Φ58 X 1800 | 0.94 | 1.33 | 100 | 180 |
| 120L-Prime | 12 | Φ58 X 1800 | 1.13 | 1.596 | 120 | 150 |
| 150L-Prime | 15 | Φ58 X 1800 | 1.41 | 1.995 | 150 | 120 |
| 180L-Prime | 18 | Φ58 X 1800 | 1.68 | 2.394 | 180 | 100 |
| 200L-Prime | 20 | Φ58 X 1800 | 1.87 | 2.66 | 200 | 90 |
| 240L-Prime | 24 | Φ58 X 1800 | 2.25 | 3.192 | 240 | 75 |
| 300L-Prime | 30 | Φ58 X 1800 | 2.811 | 3.99 | 300 | 60 |
| 360L-Prime | 36 | Φ58 X 1800 | 3.37 | 4.788 | 360 | 50 |
● Capacity available: 80/100/120/150/180/200/250/300/360L
● Inner tank: stainless steel SUS304-0.4/0.5/0.7/0.8mm
● Vacuum tube: Cu/SS-ALN(H)/SS-ALN(L)/ALN 58-1800mm
● Water tank outer tank shell: SUS-304-2B stainless steel
● Insulation: high density polyurethane,55mm
● Frame: stronger 201 stainless steel 1.2mm thickness
● Bracket angle:20/25/27/30/38/45 degree
| Solar Hot Water Storage Tank | ||
| 1 | Material of out tank | SUS-30-4-2B 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 | 470/360mm or 480/360mm |
| 7 | Welding: | Argon arc welding |
| Solar Evacuated 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 |
| Solar Water Heater Bracket | ||
| 22 | Bracket: | Coated Stronger galvanized steel-1.5mm |
| 23 | Bracket angle: | 25 degree flat roof |
| 24 | Fastening pieces: | Stainless steel. |
Thermosyphon solar water heater(compact non-pressure solar water heater) relies on the natural circulation of water between the collector and the tank or heat exchanger. As water in the vacuum tubes is heated it rises naturally into the tank, while cooler water in the tank flows down to the bottom of the vacuum tubes, causing circulation throughout the system.
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.
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.
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.
The main difference is the outer tank material.
A compact stainless steel solar heater uses SUS304 or 316L stainless steel, offering durability and corrosion resistance.
A PVDF-coated non-pressurized solar heater uses color-painted steel with a PVDF layer, providing better UV resistance and aesthetic appearance at a lower cost.
Both deliver reliable performance, but stainless steel types are preferred for coastal or humid regions.
With proper maintenance, the system can last 15 years or more. The vacuum tubes and inner SUS304 tank ensure strong corrosion resistance and stable heat absorption over time.
No. The integrated structure makes installation very easy. It usually takes 1–2 hours, and only requires connection to the cold water inlet and hot water outlet — no need for a pump, controller, or expansion tank.
It depends on your local temperature. In mild winter areas, it performs well. For freezing regions, you can choose a pressurized heat pipe solar water heater with anti-freeze circulation or install insulation measures to protect the tubes.
Maintenance is simple — clean the tubes twice a year, check for scale buildup in the tank, and ensure inlet/outlet valves work properly. No pump or electronic parts mean very low maintenance cost.
Yes. Most systems come with a built-in electric heating element as backup. When solar radiation is low, the electric heater automatically supports water heating to maintain a constant temperature.
Generally, non-pressure systems are designed for residential or small-scale use.
For hotels, schools, or factories, a split pressurized solar system or heat pipe compact system is recommended to ensure stable pressure and continuous hot water supply.
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.
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