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Quick Details

  • Type: Evacuated vacuum tube solar water heater
  • Pressure: Unpressurized
  • Circulation Type: Direct / Open Loop (Active)
  • Heating System: Thermosyphon (Passive)
  • Connection Type: Direct-Plug
  • Installation: Freestanding
  • Certification: CE, ISO9001:2008
  • Capacity: 120
  • Place of Origin: Zhejiang, China (Mainland)
  • Brand Name: OEM/SUNWE
  • Model Number: NP-GS
  • Inner tank: food grade SUS 304 2B
  • Out tank: galvanized steel
  • Insulation: Polyurethane foam
  • Frame: galvanized steel 20 degree to 45 degree
  • Vacuum tube: High performance evacuated vacuum tube
  • Option accessories: Assitant tank, electric heater, controller

Packaging & Delivery

Packaging Details standrad export packing
Delivery Time 2 weeks


15 years life span
free maintenance
competitive price
easy installation
free energy


Sunwe Non Pressure Solar Water Heater system the storage tank is horizontally mounted immediately above the solar vacuum tubes and frame on the roof. No pumping is required as the hot water naturally rises into the tank through thermosiphon flow.


How non-pressure solar water heater works
1. Non-pressure solar water heater of all glass evacuated tube collector integrated with storage tank, are ideal for use in houses and other applications where cheap, reliable hot water supply is required. They are simple, economic and practical.

2. As the specific density of hot water and cold water are different, cold water goes downward and hot water goes upward.
3. When cold water in evacuated tubes is heated, it becaomes lighter and goes to the water tank, while cold water in the tank goes down to the evacuated tubes
4. Through this circulation, the cold water in the water tank will be gradually heated.


Non-pressure solar water heater features
1. Cheap and reliable solution, Simple structure, Easy installation

2. High efficiency
3. Withstands water pressure no more than 0.1MPa
4. Operated without any power supplying
5. Electric heater can be used as back up in rainy days
6. Hot water can be used directly, or can be used as a pre-heated


Solar hot water heating system optional accessories
1. Assistant tank: 3/5/8/10/12L
2. Controller
3. Electrical heater: 1.5/2/2.5kw


Solar hot water heating system specification


Non-pressure solar water heater

Material of out tank

0.31-0.4mm thickness color steel/ fluorine carbon steel

Material of inner tank

Food grade 0.31-0.6mm thickness SUS304 stainless steel

Tank insulating layer

50mm 45kg/m³ high-density polyurethane foamed

Inlet and outlet hole

Male G 1/2, 3/4

Max pressure

0.05 Mpa

Solar collector tube

3.3 Borosilicate glass with N/Al coating

Thickness of glass tube


Vacuum tube tightness

P≤0.005 Pa



Emission ratio


Idle sunning property parameters


Average heat loss coefficient



Aluminium alloy

Structure of tank:

4 holes for air vent,overflow,water inlet and outlet,electric heater


Argon arc welding

Fastening pieces:

Made of stainless steel screw




1. Frame box open


2. Front leg, rear leg and tank holder assemble as picture below


3. Assemble another side front leg and rear leg to tank holder as photo below


4. Rear support assemble


5. Front support and tube holder assemble as photo below

6. Water tank assemble to the frame as photo below


7. Assemble the assstant tank and exhaust pipe as photo below (exhaust pipe must be higher)


8. Assemble the tube one by one as photo below


9. Complete installation as photo below

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