Home » Products » Solar Water Heater » Non Pressure Solar Water Heater » 150L thermosiphon glass vacuum tube solar water heater

150L thermosiphon glass vacuum tube solar water heater

Thermosiphon integrated solar hot water heater with solar evacuated tubes, high efficiency, low price, easy installation, 20 years lifetime, 10 years warranty, suitable for Asia, middle east, south america, and most africa countries.
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  • RNE-NC-15

  • SOLARAVEN

  • 841912

Overview


Our Non-Pressure Solar Water Heater combines cutting-edge engineering with user-centric design to deliver an affordable and sustainable hot water solution. Unlike pressurized systems, this model eliminates the need for complex plumbing or pumps, reducing installation costs and technical barriers. It is particularly advantageous for regions with limited infrastructure, offering a reliable hot water supply through solar energy. With a focus on durability and efficiency, this system is engineered to withstand extreme weather while maintaining peak performance for over 15 years. The open-loop design ensures minimal energy loss, and the modular architecture allows users to expand capacity as demand grows.


Features


1. Gravity-Fed Operation: Water flows naturally via gravity, eliminating dependency on pumps or electricity. The elevated tank design ensures consistent water pressure at outlets.

2. Adjustable Frame: A galvanized steel支架 allows tilt adjustment to optimize solar exposure seasonally. Angling ranges from 15° to 50° to accommodate latitude-specific solar angles.

3. Overheat Protection: Built-in heat dissipation vents prevent overheating during peak sunlight hours. A temperature relief valve automatically releases excess hot water into a backup reservoir.

4. Large Capacity Tanks: Available in 100L to 500L sizes to accommodate varying user demands. Tanks include a sacrificial anode to combat corrosion and extend lifespan.

5. Leak-Proof Connections: High-quality silicone seals and brass fittings ensure durability and prevent water wastage. All joints are pressure-tested up to 6 bar for reliability.

6. Cost Savings: Reduces energy bills by up to 80% compared to electric/gas heaters. Payback periods average 3–5 years depending on local energy costs.


Applications


· Urban Residential Complexes: Integrates seamlessly into multi-story buildings with rooftop setups. Centralized systems can serve entire apartment blocks.

· Industrial Use: Provides hot water for manufacturing processes, reducing fossil fuel reliance. Suitable for textile dyeing, food processing, and chemical plants.

· Camping Sites: Portable versions with foldable collectors cater to outdoor enthusiasts needing off-grid hot water for showers and cooking.

· Disaster Relief: Rapid-deployment units aid emergency shelters in crisis situations. Lightweight models can be airlifted to remote areas.

· Green Buildings: Complies with LEED and BREEAM certifications, enhancing sustainability scores for eco-conscious projects.


FAQ


1. What if there’s no sunlight for days?

A backup electric heating rod (optional) can maintain water temperature during extended cloudy periods. The 1500W rod heats 100L water from 20°C to 60°C in 2.5 hours.

2. Is the water safe for drinking?

Yes, provided the tank is cleaned regularly and local water quality meets hygiene standards. The system does not alter water chemistry or introduce contaminants.

3. Can the system handle hard water?

A water softener accessory is recommended to prevent scaling in areas with hard water. Alternatively, periodic flushing with vinegar solution dissolves mineral deposits.

4. What warranty is offered?

Standard 5-year warranty on tanks and 2 years on components, extendable upon request. Professional installation is required to validate the warranty.

5. How to clean the solar tubes?

Rinse tubes with a garden hose every 6 months. For stubborn dirt, use a soft brush and mild detergent. Avoid abrasive tools to prevent scratching.



Non Pressure Solar Water Heater


The thermosiphon solar water heater adopts solar vacuum tube technology, the solar evacuated tubes absorber will collect heat from the sunlight and transfer into water inside the tubes. The tube water is heated to rise up and tank cold water sink down to creat a circulation, called thermosiphon effect. The water tank will be gradully full of hot water as the tubes keep collecting heat from the sunlight.  It is no need of electricity heating. It is only by solar thermal heating. 

Non Pressure Solar Water Heater




Thermosiphon solar water heater specification:

Model

Solar Vacuum Tube

Capacity

Absorber Area

Suitable for

Pcs

Size(mm)

(L)

(㎡)

(Persons)

RNE-NC-10

10

58×1800

100

1.330

2

RNE-NC-15

15

58×1800

150

1.995

3

RNE-NC-20

20

58×1800

200

2.660

4

RNE-NC-25

25

58×1800

250

3.325

5

RNE-NC-30

30

58×1800

300

3.990

6


More details of  non pressure solar heater technical data :

thermosiphon   Solar water heater with solar vacuum tubes

Solar Water Tank

1

Material of   Outer Tank Shell

Galvanized steel with anti corrosive paint

2

Material of   Inner Tank Chest

stainless steel 304 2B or 316L

3

Water Tank   Diameter

【460/360MM】

4

Water Tank   Insulating Layer

Imported   Polyurethane,High Density,【50MM】

5

Heat   Preservation Period

72~80Hours

6

Welding Method

Argon Arc   Welding

Solar Vacuum Tube

7

Solar vacuum tube structure

All-Glass Double   Co-Axial Structure

8

Glass Material

High   Borosilicate 3.3 Glass

9

Tube Size

【diameter 58MM* length 1800MM or 1500MM】 

10

Outer Tube   Dia.&Glass Thickness

φ58±0.7mm,Glass   Thickness 1.6±0.15mm

11

Inner Tube   Dia.&Glass Thickness

φ47±0.7mm,Glass   Thickness 1.6±0.15mm

12

Coating Material

【CU/SS-ALN(H)/SS-ALN(L)/ALN】

13

Sediment Method

Tri-Element   Magnetron Sputtering Plating

14

Absorb Ratio

>96%(AM1.5)

15

Thermal   Emissivity

≤6%/(80℃)

16

Hail Resistance

φ25mm

Solar water heater 

Bracket

17

Bracket Material

【Stronger Galvanized Steel】

18

Bracket Angle

【25 / 45°】

19

Bolts&Muts

Stainless Steel

Assistant Tank

20

Assistant Tank   Material

Stainless steel 

21

Assistant Tank   Capacity

【5L/8L/20L】

22

Assistant Tank   Model

Vertical/Horizontal,Optional


150L thermosiphon solar water heater with 15pcs solar vacuum tubes. 


Non Pressure Solar Water HeaterNon Pressure Solar Water Heater





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