Solar water heater open system 150 liters non-pressure BERG NSF150

Solar water heater open system 150 liters without pressure BERG NSF150 is a solar system of open type with a capacity of 150 liters. It includes mounting elements and silicone rings, one inlet for the heater, and a supplementary tank with a stainless steel float with a volume of 5 liters. The system uses 15 borosilicate glass tubes.

• High-quality stainless steel SUS304-2B, thickness 0.31–0.5 mm
• External tank made of high-quality stainless steel, thickness 0.31–0.5 mm
• Insulation made of polyurethane foam with a thickness of 50–55 mm
• Vacuum tubes CU/SS-AL/N – 15 pieces
• Frame made of stainless steel and aluminum alloy, thickness 1.2–2 mm
• Filling tank made of stainless steel with a volume of 5 liters
• Available accessories: filling tank, solar controller, electric heater, magnetic rod, thermostatic mixing valve

The system captures up to 95% of sunlight thanks to the high-efficiency coating of the vacuum tubes. Even in weaker sunlight, the vacuum tubes ensure effective operation of the heater.

Operating principle:

• Solar absorption: Thermal energy is absorbed in the vacuum tubes and converted into concentrated heat.
• Solar heat transfer: Copper tubes with a core filled with heat transfer gas carry the heat to the main copper tube.
• Solar heat storage: The thermal expansion of the gas transfers the solution (water or another liquid) from the tubes to the main copper tube, raising the temperature by 5–10 °C.

Thermal energy is transferred through a cycle of evaporation and condensation in the heat tubes, ensuring continuous heat transfer to the tank.

The vacuum tubes are the main energy absorbers in solar water heaters. They convert solar energy into heat for domestic hot water. This type of tube is preferred due to its reliability, high efficiency, and low production costs.

Tank – heat exchanger

For the system to function properly, the tank must be positioned above the collector to avoid backflow and heat loss at night. The tank operates without pressure, making it safe to use.

The outer and inner walls of the tank are made of stainless steel SUS304 with a thickness of 0.5 mm, certified for anti-toxin use. Insulation is provided by 50 mm polyurethane foam, which effectively retains heat.

Stainless steel is a corrosion-resistant material processed through an advanced casting process that eliminates the risk of rusting in the tank.

• Independence from rising electricity prices
• Operation without the need for pumps, pipes, and additional devices
• Year-round use, including in winter with sufficient sunlight
• The materials of the stand and water container are made of stainless steel, preventing corrosion
• Temperature in the vacuum tube reaches 250 °C, and water is heated to 100 °C in about 3 hours
• The system operates without pressure and is completely safe
• The construction withstands hail of 25 mm size
• The absorbing surface absorbs about 93–94% of solar rays
• The system continues to operate even if a tube breaks, as long as it is sealed
• Low costs for connecting to the water system
• Very low temperature losses due to good insulation of the vacuum environment and water transport tubes
• The design of the collector provides good wind resistance
• Effective operation even with orientations different from the optimal southern one, thanks to the round shape of the tubes
• Up to twice as effective during the winter period compared to flat collectors
• Does not retain snow and dust

Instructions