Split System Water Heater

I. Product Introduction

The flat plate split system solar water heater (Split System Water Heater) is a pressure-bearing solar water heating system specially designed for overseas high-end residences, villas, resorts, and small and medium-sized commercial venues. The product adopts a split structure, with the flat collector installed separately from the 316 stainless steel double tube water tank - the collector can be flexibly arranged on the roof, balcony or wall, while the water tank is placed indoors, attic or basement, perfectly adapting to different architectural styles in regions such as Europe, Australia, and Southeast Asia. The capacity supports customization from 100L to 1000L, easily meeting the diverse water usage demands ranging from 2-person households to hotels, schools, and factory dormitories. 

The flat plate collector is equipped with a high-strength aluminum alloy frame and low iron tempered glass. The interior features a full copper flow channel, and the surface is covered with a highly selective heat absorption coating (blue titanium film). The absorption rate is ≥ 95%, and the emission rate is ≤ 5%. Its flat structure is modern and sleek, enabling solar energy integration with buildings (BIPV/T). It does not burst pipes, accumulates dust, and is easy to clean. It has obtained international certifications such as Solar Keymark and CE, and is suitable for strict markets like Europe and Australia. 

The inner liner of the water tank is made of 316 food-grade stainless steel, which has extremely strong resistance to chloride ion corrosion. It is particularly suitable for coastal areas (such as Australia and the islands in Southeast Asia) and areas with poor water quality. The water tank is equipped with a double coil heat exchanger (both made of copper): the lower coil is connected to the flat collector for solar heating; the upper coil can be connected to auxiliary heat sources such as electric heating, air-source heat pumps, and gas boilers to achieve multi-energy complementarity (hybrid system). The double coil design physically isolates solar energy from the auxiliary heat sources, ensuring year-round and all-day water supply. The water tank can withstand a pressure of 0.6 MPa (tested at 1.2 MPa), and the water pressure is constant, providing a bathing comfort comparable to that of an electric water heater. All materials comply with drinking water safety standards such as WRAS and ACS. 

II. Technical Parameter Table

Capacity range: 100L, 150L, 200L, 300L, 500L, 800L, 1000L (customizable as needed)

Applicable scenarios: homes, villas, hotels, schools, factory dormitories, hospitals, swimming pools, spa clubs 

Flat Plate Solar Collector

Stainless Steel Water Tank

Workstation:

III. Working Principle

The flat-panel split-type solar water heater adopts the principles of forced circulation indirect heat exchange and dual-pipe multi-energy linkage:

1. Solar heat collection: Sunlight passes through the low-iron tempered glass and is absorbed by the heat-absorbing coating to convert into thermal energy, heating the anti-freezing medium in the flow channels of the flat-panel collector.

2. Temperature difference circulation: When the outlet temperature of the collector is 5-8℃ higher than the temperature of the lower part of the water tank, the intelligent controller activates the circulation pump, pumping the high-temperature medium into the lower pipe, and the heat is transferred through the pipe wall to the domestic water in the water tank, and the cooled medium returns to the collector to form a circulation.

3. Auxiliary heating: When the water temperature in the water tank is lower than the set value (such as 45℃) and the solar energy is insufficient to raise it, the controller automatically starts the auxiliary heat source connected to the upper pipe (electric heating rod, heat pump or gas boiler) to supplement heat for the upper water layer of the water tank, ensuring the output of constant-temperature hot water.

4. Pressure-bearing water supply: The water tank is directly connected to the water supply pipe. When the hot water tap is opened, cold water is pushed into the bottom of the water tank, and hot water flows from the top, with the water pressure being the same as that of the tap water, and multiple users can use water simultaneously while maintaining stability.

5. Anti-freezing protection: At low temperatures, the controller automatically starts the circulation pump or the heating belt to prevent the collector and the pipeline from freezing, suitable for cold regions (such as Northern Europe, Canada). 

IV. Product Advantages

1. 316 stainless steel double coil pipes, highly resistant to corrosion

The inner tank of the water tank is made of 316 stainless steel, combined with the double coil pipe structure, its resistance to chloride ion corrosion is much better than 304, especially suitable for coastal areas, hot springs and areas with poor water quality. The double coil pipes support solar energy + any auxiliary heat source (electricity, gas, heat pump), ensuring year-round hot water without worries.

2. Flat collector, integrated with the building

The flat collector has a smooth and modern appearance and can be embedded in the roof, balcony or wall without damaging the architectural beauty. It is efficient in low light conditions, without tube explosion or dust accumulation, and has extremely low maintenance costs. It has passed Solar Keymark certification and complies with EU standards.

3. Capacity from 100L to 1000L, fully customizable

From 100L for small families to 1000L for commercial systems, the capacity can be customized as needed, flexibly matching different water usage scenarios in villas, apartments, hotels, factories, etc. Multiple water tanks can be connected in parallel to expand to a larger scale.

4. Split design, no installation restrictions

The collector and water tank are separated. The water tank can be placed indoors, basement or equipment room, perfectly solving the problem of no roof space in high-rise buildings. The longest circulation pipeline is up to 30 meters, suitable for various complex building structures.

5. Intelligent dual-source control, energy-saving and convenient

The intelligent controller automatically prioritizes the use of solar energy, seamlessly switching to auxiliary heat sources when insufficient. It can be optionally equipped with a Wi-Fi module, allowing remote monitoring of water temperature and setting heating time through a mobile app. It can save energy costs by 60%-80% annually, meeting the European ErP energy efficiency standards.

6. Pressure-bearing operation, stable and constant temperature

The system has a pressure of 0.6 MPa, the water supply pressure is the same as that of the tap water, providing a stable bathing experience, completely getting rid of the problems of thin water flow and large temperature fluctuations in traditional solar energy, meeting the comfort requirements of European users. 

V. Factory Advantages

Our company has been dedicated to the research and manufacturing of split-type solar water heaters for 15 years. We possess a complete industrial chain and extensive export experience, and are trusted OEM/ODM partners by overseas customers.

1. International Certifications: We have obtained certifications such as ISO9001, ISO14001, Solar Keymark, and CE. Our products are sold in 50+ countries including Europe, Australia, the Middle East, Southeast Asia, and North and South America.

2. Core Self-production: We have fully automated welding lines for flat plate collectors, CNC processing lines for 316 stainless steel water tanks, and high-pressure foaming assembly lines. Key components are produced independently, ensuring full quality control throughout the process and stable delivery schedules.

3. Dual Coil Specialization: Our independently developed dual coil structure has been optimized through fluid simulation, featuring high heat exchange efficiency. The upper coil can be customized with interface specifications and power according to customer requirements.

4. Capacity Customization Capability: We support customization of any capacity from 100L to 1000L. We offer OEM/ODM services to meet the special needs of engineering projects, with flexible minimum order quantities.

5. After-sales Guarantee: The entire machine is covered by a 3-year warranty. We provide English installation videos, technical manuals, CAD drawings, and remote guidance. 

VI. List of Accessories

VII. Installation Precautions

1. Orientation and inclination of the collector: Facing south (north in the Southern Hemisphere) or within 15° to the west, the inclination should be within ±10° of the local latitude. Avoid obstructions.

2. Position of the water tank: The water tank should be placed near an interior load-bearing wall, with a reserved drainage floor drain on the ground. A 1000L water tank filled to capacity weighs approximately 1.1 tons, so the floor load-bearing capacity must be confirmed.

3. Circulation pipeline: The length of the solar side circulation pipeline should not exceed 30 meters. It should be insulated (≥30mm), and an electric heating belt should be added for anti-freezing in the outdoor section (in cold regions).

4. Anti-freezing fluid addition: The concentration of the anti-freezing fluid should be configured according to the local minimum temperature (-15℃ to -35℃). Regularly check the liquid level and pH value after the system operation.

5. Electrical connection: The controller, circulation pump, and auxiliary heat source should be on separate circuits. Install an earth leakage protection switch, ensure reliable grounding, and comply with local electrical standards.

6. Pressure test: After installation, conduct a 1.2MPa water pressure test on the water tank and the collector side separately. Maintain the pressure for 30 minutes without leakage. 

VIII. Application Cases

1. Beach Villa: Located in an area with high salt spray, a 300L 316 stainless steel double-pipe system and a 6m² flat plate collector were selected. The auxiliary heat source was an air-source heat pump. It was corrosion-free and saved electricity costs.

2. Small Hotel: Two 1000L double-pipe water tanks in parallel and a 40m² flat plate collector were configured for 20 guest rooms. The auxiliary heat source was a gas boiler. The annual operating cost was only 45% of pure gas heating.

3. School: Three 500L double-pipe water tanks in parallel and a 30m² collector array were installed to meet the shower needs of 300 students. In summer, it was completely free, and in winter, electric heating was supplemented. The investment payback period was 1.5 years. 

IX. Development Trends

1. Split-type dominates the global market: With the widespread adoption of high-rise residences, split-type solar energy has seen a continuous increase in market share in Europe, the Middle East, and Southeast Asia due to its flexible installation and aesthetic appeal.

2. 316 stainless steel becomes the standard for high-end products: With an increase in coastal and high-demand projects, 316 stainless steel, due to its superior corrosion resistance, is gradually replacing 304 and has become a standard for high-end products exported to Europe and Australia.

3. Dual coil tubes + multi-energy complementarity: As users' requirements for stable hot water throughout the year increase, the dual coil tube design allows for the connection of various auxiliary heat sources such as heat pumps, gas, and electricity, making it the core competitiveness of split-type solar energy.

4. Capacity customization and modularization: From 100L to 1000L and even larger, customizing capacity according to needs has become a clear requirement for engineering contractors, and the modular parallel connection scheme is more favored.

5. Intelligent IoT and remote operation: Wi-Fi/4G controllers have become standard equipment. Users and engineering contractors can remotely monitor, set, and diagnose faults through mobile apps, significantly reducing service costs.

6. Deepening integration with buildings: Flat plate collectors are deeply integrated with photovoltaic modules, balcony railings, and curtain walls. PVT (photovoltaic thermal) integrated products have begun to enter the market.

Summary: The flat plate split-type solar water heater (Split System Water Heater) offers an ideal energy-saving hot water solution for residential and commercial markets worldwide. We sincerely invite overseas distributors, distributors, and engineering contractors to join hands and work together to explore the green energy market! 

Contact us immediately to obtain the 316 double-coil pipe system solution, export quotations and channel cooperation policies! 

Website: www.btesolar.com