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300L all stainless steel non pressure evacuated tube solar hot water heater

Non pressure compact 300liter solar water heater with 30 solar vacuum tubes, all stainless steel water tank and stand parts, anti corrosive , high efficiency, low price, easy installation, suitable for most coast areas and islands. 
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  • RNE-NS-30

  • SOLARAVEN

  • 841912

Overview


The Non-Pressure Solar Water Heater offers a pragmatic, entry-level solution for sustainable hot water generation, particularly suited for regions with limited infrastructure. Operating on passive thermosiphon principles, this system eliminates pumps and electrical components, ensuring silent, energy-independent operation. Its open-loop design features a rooftop-mounted collector connected directly to an insulated storage tank, allowing natural convection to circulate water. Constructed with food-grade 304 stainless steel tanks and ethylene propylene diene monomer (EPDM) seals, it guarantees safe water storage while resisting scale buildup. Ideal for budget-conscious consumers, it achieves a 70% reduction in water heating costs compared to electric geysers, with a carbon payback period under two years.


Features


1. Gravity-Fed Simplicity: Water flows naturally between collector and tank, requiring zero external power.

2. Overheat Protection: Built-in thermal venting valves automatically release excess steam during stagnation.

3. Freeze Resilience: Optional vacuum tube collectors or drain-back systems prevent ice damage in sub-zero climates.

4. Scald Prevention: Mixing valves allow safe temperature adjustment at point-of-use outlets.

5. Portable Design: Compact 100L–200L tank models suit RVs, boats, and off-grid cabins.


Applications


· Rural Clinics: Sterilizes medical instruments and provides warm water for patient care in remote areas.

· Small Businesses: Supports hair salons, laundromats, and restaurants with low-volume hot water needs.

· Educational Institutions: Installed in school dormitories to promote hygiene and reduce operational expenses.

· Religious Centers: Supplies ablution water for mosques, temples, and community centers.


FAQ


1. How is water quality maintained in open-loop systems?

Regular tank descaling (every 6–12 months) and replaceable magnesium anodes prevent corrosion and sediment accumulation.

2. Can the heater be wall-mounted?

Yes, lightweight models (under 150kg when full) support wall installation with reinforced brackets.

3. What is the maximum achievable water temperature?

Under peak sunlight, temperatures reach 65–75°C, suitable for sanitation but requiring mixing for direct use.

4. Are bird-proofing accessories available?

Optional polycarbonate tube shields or wire mesh kits deter nesting while maintaining airflow.

5. How does it handle hard water areas?

Inline water softeners or phosphate dispensers can be added to the inlet pipe to mitigate hardness issues.



Non Pressure Solar Water Heater


Non pressure all stainless steel solar water heater specification:

Model

Solar Vacuum Tube

Capacity

Absorber Area

Suitable for

Pcs

Size(mm)

(L)

(㎡)

(Persons)

RNE-NS-10

10

58×1800

100

1.330

2

RNE-NS-15

15

58×1800

150

1.995

3

RNE-NS-20

20

58×1800

200

2.660

4

RNE-NS-25

25

58×1800

250

3.325

5

RNE-NS-30

30

58×1800

300

3.990

6


More details of  non pressure all stainless steel solar heater technical data :

Non Pressure   Solar hot water heater with solar vacuum tubes

Solar hot 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

【stainless steel  304 or 316L】

18

Bracket Angle

【25°】

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


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