400L Solar Water Heating System Overview:

The 400L Integrated Pressurized Solar Water Heating System by RIWATT Malawi delivers reliable, energy-efficient hot water with stable pressure. Installed in 2024 by our professional engineer team and authorized Malawi distributors, this system features evacuated tubes and a durable pressurized tank, ensuring consistent performance for residential and commercial applications. Compact, robust, and optimized for Malawi’s solar conditions.

400L Solar Water Heating System Working Principles:

The integrated pressurized solar water heater uses heat pipe technology for efficient heat transfer. Evacuated tubes with copper heat pipes absorb solar energy, causing the working fluid inside the heat pipe to vaporize. The vapor rises to the condenser inside the storage tank, where heat is transferred to the water. After releasing heat, the fluid condenses and flows back to the evaporator by gravity, ensuring continuous circulation.

The pressurized storage tank delivers hot water directly with stable pressure, while sensors and a controller regulate temperature and system safety. This design ensures high efficiency and reliable performance even under changing weather conditions.

heater_solar_water_53gallon_system_diagram

400L Solar Water Heating System Unique Sales Points:

● With ADJUSTABLE bracket(suitable for both flat roof and sloop roof)
● New designed vacuum tube holder.
● New design electric element cover.
● 316L stainless steel socket.

 

solar water heater bracket suitable for flat roof and slope roof

Solar Water Heating System Technical Parameters：

Heat Pipe Solar Water Heaters Technical Parameters
1 Model IRONMAN-SERIAL
2 Water Tank
3 Material of Outer Tank Shell High Quality Stainless Steel Plate
4 Material of Inner Tank Chest Food Grade SUS304-2B SS
5 Water Tank Diameter 【360/470 mm】
6 Water Tank Insulating Layer High Density Polyurethane,【55mm】
7 Vacuum Tube
8 Tube Structure All-Glass Double-Tube Co-Axial Structure
9 Glass Material High Borosilicate 3.3 glass
10 Tube Size 58*1800mm * 24 Tubes
11 Coating Material 【Cu/SS-ALN(H)/SS-ALN(L)/ALN】
12 Sediment Method Tri-Element Magnetron Sputtering Plating
13 Absorb Ratio 0.93-0.96> 92% (AM 1.5)
14 Emission ratio 0.04-0.06(800C±50C)
15 Heat Pipe
16 Heat Pipe Material TU1 Copper
17 Heat Pipe Condenser Size 【Ø14mm Diameter】【80mm Length】
18 Heat Pipe Body Size Ø8mm Diameter
19 Riwatt Heat Pipe Pocket 【316 STAINLESS STEEL】
20 Heat-Transfer-Fins Premium Complete Type (Super Model)
21 Max.Working Temp -37 ~250C
22 Start-up Temp. of Heat Pipe <=30C
23 Working Pressure 0.7Mpa.
24 Testing Pressure 1.2Mpa.
25 Daily Efficiency 55%
26 Heat Pipe Material TU1 Copper
27 Bracket
28 Bracket Material Stronger Stainless Steel or Galvanized Steel
29 Bracket Angle 27°
30 Bolts & Nuts Stainless Steel

 

Solar Water Heating System Accessories：

riwatt_solar_water_heater_accessories

 

Heat Pipe Solar Water Heater Accessories
Serial No. Description QTY. (Pcs)
❶ PT VALVE (90/95℃ Degree ) 3/4’’ 1
❷ Non Return & Pressure Relief Valve 3/4’’ 1
❸ Backing up electric heater element. 1’ or 1 1/4” 1
❹ Vacuum Safety Valve 1
❺ Magnesium Anode 1
❻ SR609C Solar Controller 1
❼ Pre-Water-Filters 1
❽ Thermostatic mixing valve – 3/4’’ 1

solar water heating systems 200L installed in Malawi riwatt 2 sets 200L solar water heating systems well installed in malawi

riwatt 400L integrated pressurized solar water heating systems in Lilongwe，Malawi

 

FAQs

1. What is the capacity and suitable application of the 400L system?

The 400L integrated pressurized solar water heating system is ideal for large households, guesthouses, hotels, clinics, and small commercial buildings with high hot water demand.

2. Can the system work under low sunlight or cloudy weather?

Yes. The evacuated tube heat pipe design ensures high thermal efficiency, allowing the system to perform well even in cloudy or cooler conditions.

3. Does the system provide strong and stable water pressure?

Yes. The pressurized storage tank supplies hot water directly with stable pressure, making it compatible with modern plumbing and multi-story buildings.

4. Who installs the RIWATT 400L solar water heater in Malawi?

The system is installed by RIWATT’s professional engineer team together with authorized Malawi distributors, ensuring safe installation and reliable long-term operation.

5. Is backup heating available if solar energy is insufficient?

Yes. An optional electric backup heater and intelligent controller can be integrated to guarantee hot water availability when solar energy is limited.

6. Is it necessary to install a water filter? What are the advantages and how often should the cartridge be replaced?

Yes, installing a pre water filter is highly recommended. It helps remove sand, sediment, and impurities from the water supply, protecting the heat pipes, valves, and storage tank from scaling and blockage. This improves heating efficiency, extends the system’s service life, and reduces maintenance costs. Under normal water conditions, the filter cartridge should be replaced every 3–6 months, depending on local water quality and usage frequency.