150L Vacuum Glass Tube Compact Non Pressure Thermosyphon Solar Hot Water Heater
150L compact non‑pressure thermosyphon solar hot water heater is an open‑vented integrated rooftop solar unit equipped with high‑efficiency vacuum glass tubes. Compact footprint, simple structure and cost‑effective performance make it widely popular for residential households in emerging markets. Running on natural gravity thermosyphon circulation without circulation pump, controller or extra power supply. The tank works under atmospheric pressure, water supplied by gravity water tank. Optional built‑in electric heating guarantees hot‑water output under cloudy and rainy conditions. Suitable for 3‑4‑person family daily bathing, laundry and kitchen hot‑water demands.
Working Principle
- High‑borosilicate vacuum glass tubes absorb solar radiation and convert sunlight into heat to warm the inner water. Vacuum layer greatly reduces heat loss, delivering good heating performance even in cool weather.
- Driven by water density difference, hot water rises naturally into the overhead insulated storage tank; cold water flows down back into vacuum tubes, forming continuous passive thermosyphon circulation, zero electricity consumption for solar heating cycle.
- Non‑pressure open‑vented design: tank connects to atmosphere, hot‑water outlet relies on gravity height difference for water flow. Cold water feeds from overhead gravity water tank.
- When solar energy is insufficient, optional built‑in electric heating element turns on to make up heat for all‑weather hot‑water supply.
Core Technical Specifications
‑ Tank Capacity: 150 Liter ‑ Inner Tank Liner: SUS304 / SUS316L food‑grade stainless steel; replaceable magnesium sacrificial anode rod for anti‑corrosion ‑ Insulation: 45‑55 mm high‑density closed‑cell polyurethane foam, excellent heat preservation ‑ Working Mode: Non‑pressure / open‑vented, atmospheric pressure inside tank ‑ Vacuum Glass Tube: Borosilicate 3.3 glass, high‑selectivity absorbing coating; standard size 58‑1800mm ‑ Outer Casing: Color‑coated galvanized steel or stainless steel sheet ‑ Mounting Bracket: Galvanized steel / aluminum alloy anti‑rust frame ‑ Auxiliary Heating: Optional 1500‑2000W built‑in electric heating element ‑ Safety: Over‑temperature protection, dry‑heating prevention for electric heating ‑ Typical Service Life: 12‑18 years with regular maintenance ‑ Certifications: CE, ISO9001, SASO available for export shipments
Application Scenarios
‑ 3‑4‑person family residential rooftop ‑ Rural households, villas with gravity water supply system ‑ Budget‑oriented residential renovation hot‑water upgrade ‑ Areas with stable solar irradiation
Key note: Non‑pressure model requires overhead gravity water tank for water feeding. Collectors need minimum 4‑6 hours direct sunlight daily, avoid shading. Outdoor pipelines need anti‑freezing insulation in frost‑prone regions.
| Feature | 150L Compact Non‑Pressure Vacuum Tube Solar Heater | Pressurized Thermosyphon Solar Heater | Split Active Solar System |
|---|---|---|---|
| System Pressure | Open‑vented non‑pressure, gravity feed | Mains water pressure | Mains water pressure |
| Circulation Mode | Natural thermosyphon, no pump | Natural thermosyphon, no pump | Pump‑driven forced circulation |
| Power Requirement | No power for solar heating | No power for solar heating | Need power for circulation pump |
| Water Supply Requirement | Need overhead gravity water tank | Directly connect municipal tap water | Directly connect municipal tap water |
| Unit Footprint | Compact, space‑saving | Rooftop installation | Rooftop only for collectors |
| Cost Level | Economical | Mid‑high price | High price |
Key Buying Considerations
- Water supply condition: This non‑pressure unit must match gravity water tank, cannot directly connect high‑pressure municipal water pipeline.
- Rooftop load‑bearing: Check roof structural strength, the whole unit gains heavy weight after filling with water.
- Tank material: SUS316L liner is recommended for coastal and high‑hard‑water regions, confirm magnesium anode rod is included.
- Vacuum tube quality: High‑borosilicate glass tube improves anti‑aging and heat‑collection efficiency.
- Confirm whether electric heating element is included in quotation for export orders.
- Prepare target‑market required certifications for customs clearance.
Installation & Routine Maintenance
Qualified installers shall complete mounting, piping and electrical connection. Adjust collector tilt angle according to local latitude. Never activate electric heating before tank is fully filled with water.
‑ Every 3‑6‑month inspection: Clean dust on vacuum tube surface; check brackets for rust and loose bolts; inspect pipe joints for leakage. ‑ Every 1‑2‑year professional service: Replace consumed magnesium anode rod; flush tank sediment for hard‑water areas; test electric heating performance.
FAQ
Q: What is the difference between non‑pressure and pressurized solar water heater?
A: Non‑pressure open‑vented tank works under atmospheric pressure, relies on overhead gravity tank for water supply, lower cost. Pressurized model connects directly to tap‑water pipeline and provides stable shower pressure, with higher product cost.
Q: Can non‑pressure solar heater work in winter?
A: Vacuum tubes collect solar heat on sunny winter days. Outdoor pipelines must take anti‑freezing insulation treatment to avoid frost crack.
Q: How much energy can 150L non‑pressure solar hot water heater save?
A: Under proper installation, solar energy covers 60‑80% of household hot‑water consumption, greatly cutting electricity bills.
Final Conclusion
150L Vacuum Glass Tube Compact Non Pressure Thermosyphon Solar Hot Water Heater is an economical passive solar hot‑water solution. With compact design, pump‑free natural thermosyphon circulation and vacuum‑tube high‑efficiency heat collection, it fits households equipped with gravity water‑supply system. Optional electric heating realizes all‑weather hot‑water supply. Actual performance depends on correct water‑supply matching, standard rooftop installation and periodic maintenance.
