The Riwatt 500L Flat Panel Hot Water Solar Heater is designed for customers who need a large-capacity solar water heating system that combines high efficiency, durability, and modern aesthetics. Using flat panel collectors with advanced blue-selective coating, Riwatt ensures superior solar absorption and long-term performance.
This split solar water heater is ideal for homes, villas, hotels, and commercial facilities seeking energy-efficient hot water solar heat while reducing carbon emissions and operating costs.

1. 500L Split Flat Panel Hot Water Solar Heater  Overview & Key Components:

System Main Parts List :

● High-efficiency flat plate solar collector with blue-selective coated absorber
● 500L stainless steel pressurized water storage tank (inner SUS304 / outer galvanized steel (304SS optional), with inbuilt marine grade 316L stainless steel heat exchanger (superior anti-rust performance)
● SR21 Solar circulation station including high-performance pump and intelligent controller
● Expansion vessel and solar connection accessories,such as: liquid injection pump, air vent valve, DN 16, 316L stainless steel flexible pr -insulated solar hose (DN20/25 optional), ball valve, filter valve,spare vacuum tubes, adaptor and so on..

Key Specifications:

Collector Type: Flat plate, blue-selective coating2000*1000*80mm * 3 Pcs
Tank Capacity: 500 liters
Working Pressure: 6 bar
Auxiliary Heating: Electric heater/gas boiler optional
Controller: Intelligent differential solar controller

2. How Does the 500L Hot Water Solar Heater Work:

The flat panel collector absorbs sunlight and converts it into heat energy. Through the circulation pump, this heat is transferred to the pressurized water tank, heating the stored water efficiently.
Because the split type design separates the tank and the collector, the system allows flexible installation: the collector is mounted on the roof for maximum sunlight, while the tank is installed indoors for better insulation and longevity.
Reliable operation in all seasons with optional backup electric heater for cloudy days.

3. Advantages of Flat Panel Hot Water Solar Heater Design:

● Flexible Installation – No heavy water tank on the roof, ideal for modern architecture.
● High Pressure Compatibility – Works perfectly with household or commercial plumbing systems.
● Elegant Design – The indoor stainless steel solar water tank looks clean and professional.
● Easy Maintenance – Split layout simplifies inspections and component replacement.
● Long Service Life – Quality materials and professional engineering ensure long-term reliability.

The RIWATT 500L split type solar water heater is an excellent choice for those who value both performance and aesthetics in their solar hot water system.

4. Application Scenarios of 500L Split Flat Panel Hot Water Solar Heater:

This 500L solar water heater is suitable for a wide range of applications:
● Large homes and villas (5–8 people)
● Hotels, resorts, and guesthouses
● Schools, hospitals, and gyms
● Beauty salons and commercial facilities

Whether for residential or commercial solar water heating, the RIWATT flat panel solar water heater provides dependable and sustainable hot water solar heat all year round.

5. Energy Savings & Environmental Benefits:

Compared to electric or gas water heaters, the RIWATT Hot Water Solar Heater offers significant benefits:
● Up to 70–80% energy savings per year
● Short payback period (2–4 years depending on location and usage)
● Reduced CO₂ emissions, supporting green building goals
● Lower long-term operating costs

Choosing RIWATT means investing in renewable energy and a sustainable lifestyle.

6. Installation & System Design:

The RIWATT 500L Split Flat Panel Solar Water Heater supports flexible design options:

● Collector installation: roof, ground, or wall-mounted
● Tank placement: indoor or technical room
● Piping distance: up to 20 meters between collector and tank
● Smart controller: automatically starts circulation based on temperature difference

Maintenance Tips:

●  Check solar fluid and circulation pump annually
● Keep collector surface clean for maximum efficiency
● Inspect valves and connections for leaks

These practices ensure your RIWATT solar water heating system maintains top performance for years.

7. Quality & Certification:

All Riwatt solar water heaters are manufactured under strict quality standards:
● CE & ISO9001 certified
● Tested flat plate collectors for long-term solar exposure
● 5-year warranty on collector, 3-year warranty on tank
● 100% inspection before delivery

RIWATT’s commitment to high-quality solar water heating systems guarantees reliability and customer satisfaction worldwide.

8. Partner with Riwatt:

Riwatt is expanding its global distributor network for solar water heating products ranging from 200L to 1000L capacities.
If you are interested in representing a trusted solar water heater manufacturer, join us in promoting sustainable hot water solar heat solutions in your market.

📞 +86 180 0660 1051
📧 info@riwatt.com
🌐 www.riwatt.com

Conclusion

The RIWATT 500L Split Type Flat Panel Solar Water Heater delivers a perfect balance of technology, performance, and environmental responsibility. With high-efficiency solar collectors, pressurized tank design, and intelligent control, it provides consistent hot water solar heat for homes and commercial buildings.
Choose RIWATT — your trusted partner for energy-efficient solar water heating systems that power a greener future.

FAQs About Hot Water Solar Heater

FAQ 1: Which is more efficient—flat panel or heat pipe evacuated tube Hot Water Solar Heater?

Flat panel Hot Water Solar Heaters work very well in strong sunlight and warm climates, offering stable thermal performance.
Heat pipe evacuated tube systems perform better in cold or cloudy environments because the evacuated tubes reduce heat loss.
For regions with winter or low temperatures, RIWATT evacuated tube Hot Water Solar Heater systems usually achieve higher efficiency.

FAQ 2: Which type is more durable and requires less maintenance?

Flat panel Hot Water Solar Heaters have a simple, sealed structure, making them durable and low-maintenance.
Heat pipe evacuated tube heaters are also reliable, but individual tubes can break more easily from impact. The advantage is that one damaged evacuated tube can be replaced without shutting down the whole system.

FAQ 3: Which solar water heater is better for high-pressure household use?

Both flat panel and evacuated tube systems can be designed as pressurized Hot Water Solar Heaters, but flat panel designs have a stronger metal absorber panel that tolerates pressure more stably.
Heat pipe evacuated tube systems also support pressurized tanks, but the tubes themselves stay non-pressurized, making the system safe and efficient.

FAQ 4: What is the best choice for hotels or large hot water projects?

For large demand applications—such as hotels, apartments or commercial buildings:
●  Flat panel Hot Water Solar Heaters offer high output per square meter, ideal for centralized installation.
●Heat pipe evacuated tube Hot Water Solar Heaters are preferred when high efficiency is needed in colder climates.
RIWATT provides both systems, helping customers choose the most suitable Hot Water Solar Heater solution based on climate, installation space, project size and hot water consumption.