100L 150L 200L Rooftop Non‑Pressurized Sun Heater
100L 150L 200L Rooftop Non‑Pressurized Sun Heater is compact integrated thermosyphon solar hot‑water unit specially built for residential rooftop installation. The whole assembly combines storage tank and evacuated vacuum‑tube collectors into one solid unit, mounted directly on flat or sloped rooftops. Running on natural gravity‑driven thermosyphon circulation without pumps or electric power for solar heating, this non‑pressurized sun heater delivers affordable hot‑water solutions for small‑to‑medium households. It requires an auxiliary feed tank with float‑valve for automatic water refilling. Optional built‑in electric heating compensates heat output during cloudy‑rainy days, securing daily hot‑water supply for bathing, laundry and kitchen use.
Working Principle
- High‑transmittance borosilicate evacuated vacuum tubes mounted on rooftop capture solar radiation. Solar energy converts into thermal energy and heats water inside tubes. Hot‑cold water density difference creates natural thermosyphon flow, circulating hot water upward into the integrated storage tank, while cold water sinks down into vacuum tubes for re‑heating. No circulation pump or external power is needed for solar‑driven heating process.
- The storage tank operates under full atmospheric non‑pressurized condition. Hot water flows out purely by gravity water‑head height difference. An external auxiliary feed tank equipped with float‑ball valve is mandatory. It automatically supplements water to main tank when water level drops and stops inflow once full, preventing overflow and dry‑burn risks. Direct connection of municipal high‑pressure tap‑water to main tank body is strictly forbidden.
- When solar irradiation is insufficient and water temperature fails to meet daily usage needs, optional built‑in electric heating element activates to raise water temperature. This backup function guarantees usable hot‑water output regardless of changing weather conditions.
Important note: Full rooftop load‑bearing inspection must be completed before installation. Auxiliary feed tank needs to be installed higher than main unit to realize gravity‑fed water supply. Apply pipeline anti‑freeze insulation in frost‑prone zones. Magnesium sacrificial anode rod is consumable and needs regular inspection and replacement. All‑glass vacuum tubes contain domestic water; physical breakage will cause water leakage from the whole system.
Core Technical Specifications
‑ Available Tank Capacity: 100L /150L /200L ‑ Inner Tank Liner: SUS304‑2B / SUS316L food‑grade stainless steel; replaceable magnesium sacrificial anode rod ‑ Insulation: 45‑50 mm high‑density closed‑cell PU integral foaming, minimizes standby heat loss ‑ Working Pressure: Non‑pressurized atmospheric working mode ‑ Solar Collector: Φ58×1800mm borosilicate evacuated vacuum tubes, magnetron sputtering selective absorbing coating ‑ Circulation Mode: Passive natural thermosyphon circulation, zero‑power consumption for solar heating ‑ Water Feeding: Requires matched auxiliary feed tank with float‑ball valve for automatic water refilling ‑ Auxiliary Heating: Optional 1500‑2500W built‑in electric heating element ‑ Outer Casing & Bracket: Color‑coated galvanized steel outer shell, heavy‑duty hot‑dip galvanized rooftop mounting bracket ‑ Typical Service Life: 12‑17 years under standardized routine maintenance ‑ Certifications: CE, ISO9001 available for global export shipments
Application Scenarios
‑ 100L capacity: 2‑3‑person small‑family daily hot‑water demand ‑ 150L capacity: 3‑5‑person medium‑size household hot‑water usage ‑ 200L capacity: 5‑7‑person large‑family or multi‑bathroom residential buildings ‑ Flat roof, sloped tile‑roof residential houses, rural housing, residential energy‑saving renovation projects ‑ Sun‑rich regions, households looking for low‑cost, simple‑structure solar hot‑water solutions
Collectors need minimum 4‑6 hours effective direct sunlight per day. Avoid shading from nearby trees and buildings. Clear dust accumulation on vacuum‑tube surfaces regularly to sustain solar collecting efficiency. Confirm rooftop structural load capacity before equipment delivery and installation.
| Feature | 100‑200L Rooftop Non‑Pressurized Sun Heater | Split Non‑Pressurized Solar Water Heater | Rooftop Integrated Pressurized Solar Heater |
|---|---|---|---|
| Unit Structure | All‑in‑one compact rooftop unit | Separated collectors and storage tank | All‑in‑one compact rooftop unit |
| Circulation | Passive thermosyphon, no pump | Active pump‑driven circulation | Passive thermosyphon, no pump |
| Tank Working Status | Non‑pressurized atmospheric tank | Non‑pressurized atmospheric tank | Full tank bears mains water pressure |
| Water Outlet Pressure | Gravity water‑head outflow | Gravity water‑head outflow | Stable municipal tap‑water pressure |
| Power For Solar Heating | Zero power required | Needs power for pump and controller | Zero power required |
| Water Feeding Requirement | Need auxiliary feed tank | Need auxiliary feed tank | Direct tap‑water connection |
| Cost Level | Economical entry‑level solution | Medium investment | Higher investment |
Key Buying Considerations
- Rooftop load check: Verify rooftop structure can support total weight of full unit filled with water before installation.
- Feed‑tank configuration: Auxiliary feed tank must be installed above main sun heater unit to ensure gravity‑driven automatic water refilling. Never connect high‑pressure tap‑water directly to non‑pressurized storage tank.
- Material selection: SUS316L inner tank liner is strongly recommended for coastal salt‑spray areas and high‑hard‑water‑quality locations.
- Climate adaption: In cold frost‑prone regions, add pipeline anti‑freeze insulation. Since domestic water flows inside all‑glass vacuum tubes, take protective measures to avoid tube freezing cracking.
- Quotation confirmation: Confirm full‑set scope including integrated tank‑tube unit, heavy‑duty mounting bracket, sealing accessories; clarify whether auxiliary feed tank and electric heating component are included in the supply range.
- OEM support: Custom tank capacity, tube quantity and brand logo for bulk export orders.
- Export compliance: Complete CE and ISO9001 certification documents can be provided for overseas customs clearance.
Installation & Routine Maintenance
Installation shall be performed by professional certified solar installers. Adjust unit tilt angle according to local latitude to maximize solar radiation absorption. Complete water‑filling and leakage test before formal commissioning. Never turn on electric heating unless storage tank is fully filled with water.
‑ Every 3‑6‑month inspection: Clean dust and dirt on vacuum‑tube outer surface; check pipe joints and sealing rings for water leakage; test float‑valve working status of auxiliary feed tank. ‑ Every 1‑2‑year professional service: Replace consumed magnesium sacrificial anode rod; inspect vacuum tubes for cracks; check bracket fastening condition and anti‑rust performance.
FAQ
Q: How much hot water can 100L,150L and 200L rooftop non‑pressurized sun heater produce?
A: Under sufficient sunlight conditions, 100L model meets daily hot‑water needs for 2‑3 people; 150L suits 3‑5 people; 200L version supports 5‑7‑person household usage. Actual output varies with local solar irradiance and ambient temperature.
Q: Why can not I connect city tap‑water directly to this non‑pressurized sun heater?
A: The main storage tank is designed for atmospheric non‑pressurized operation. Mains tap‑water carries high pressure, direct connection will damage tank structure and cause safety hazards. Auxiliary feed tank with float‑valve is required for safe water supply.
Q: What is the main advantage of integrated rooftop non‑pressurized sun heater?
A: Simple all‑in‑one structure, no circulation pump or complex control parts, low failure rate and affordable cost. Passive thermosyphon design consumes zero electricity during solar heating, ideal choice for households with limited budget and stable rooftop installation conditions.
Final Conclusion
100L 150L 200L Rooftop Non‑Pressurized Sun Heater is cost‑effective all‑in‑one solar hot‑water solution for residential rooftops. It adopts passive thermosyphon circulation without pumps, featuring simple mechanical structure and low operation failure risk. Multiple capacity options match different‑size‑family hot‑water consumption. The non‑pressurized storage tank needs matched auxiliary feed tank for automatic water refilling. Optional electric heating provides reliable backup hot‑water supply in low‑sunlight weather. Proper rooftop load evaluation, professional installation and periodic maintenance extend system service life and keep stable energy‑saving performance for daily household hot‑water usage.
