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SOLETKS Flat Plate Integrated Solar Water Heater

SOLETKS Flat Plate Integrated Solar Water Heater is a fully engineered, pressurized thermosiphon solar hot water system designed for reliable residential and light commercial applications. By integrating a high-efficiency flat plate collector, a pressurized storage tank, and standardized safety and mounting components into one compact unit, the system delivers stable, hygienic hot water with minimal maintenance. Operating on natural circulation without pumps, it prioritizes long-term reliability, simplicity, and predictable lifecycle performance. With stainless steel or enamel tank options, auxiliary electric heating, and modular capacities from 150 L to 300 L, the SOLETKS integrated solution offers a practical, engineering-driven approach to solar domestic hot water worldwide.

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Product Details

High-Efficiency Natural Circulation Compact All-in-One Design Long-Term Reliability

SOLETKS Flat Plate Integrated Solar Water Heater

Fully engineered solar thermal system for stable, hygienic, and energy-efficient domestic hot water

Natural Circulation

No pump required, thermosiphon principle ensures reliable operation without mechanical complexity

Pressurized Top-Outlet System

Stable water pressure delivery with pressurized tank design for consistent performance

Factory-Integrated Design

Flat plate collector and storage tank pre-assembled for plug-and-play installation

Dual Tank Options

Choose between Stainless Steel or Enamel tank based on water quality and budget requirements

Hybrid Heating System

Solar energy with auxiliary electric heating backup ensures hot water availability 24/7

Engineered for Real-World Performance

The SOLETKS Flat Plate Integrated Solar Water Heater is a fully engineered solar thermal system designed to deliver stable, hygienic, and energy-efficient domestic hot water for residential and light commercial applications worldwide.

By integrating high-performance flat plate solar collectors, a pressurized hot water storage tank, and standardized mounting and safety components into one compact unit, the system provides reliable hot water with minimal operational complexity and predictable long-term performance.

Unlike pump-driven or highly customized split systems, the SOLETKS integrated solution operates based on the natural circulation (thermosiphon) principle, eliminating circulation pumps, complex hydraulic controls, and unnecessary failure points.

How It Works

Natural circulation system in action

Product Overview – A Complete Solar Hot Water System

The SOLETKS flat plate integrated solar water heater is not a collection of separate components, but a complete domestic hot water system delivered as a standardized package.

Each system is factory-engineered to ensure:

Stable thermal performance
Consistent installation quality
Predictable long-term operation

By combining solar energy with auxiliary electric heating, the system ensures 24-hour hot water availability, even during extended periods of low solar irradiation or unfavorable weather conditions.

Typical Applications

Versatile solution for residential and light commercial hot water needs

Residential

Single-family houses, villas, and apartment buildings

Hospitality

Small hotels, guesthouses, and hostels

Institutional

Schools, clinics, and staff dormitories

Commercial

Light commercial buildings with hot water demand

Flexible Configuration

The system supports both single-unit installations and parallel system configurations for higher hot water demand.

This modular approach allows for scalable deployment across different project sizes while maintaining consistent performance and reliability standards.

Complete System Scope & Delivery

To reduce installation risk and improve project consistency, every SOLETKS flat plate integrated solar water heater is supplied as a ready-to-install system.

What's Included in One Complete System

Flat Plate Solar Collector(s)

Pressurized Hot Water Storage Tank

Stainless steel water tank or
Enamel water tank

Galvanized Steel Mounting Structure

Integrated Safety Components

T/P temperature & pressure relief valve
Safety valve
Check valve

Controller and Auxiliary Electric Heating Element

Full Installation Accessories Kit

Complete System Package

Predictable Performance Factory-tested integration

Simplified Logistics Single-package delivery

Reduced Installation Errors Pre-configured components

Standard Capacity Configurations & Modular Logic

SOLETKS adopts a clear and controlled configuration strategy to simplify selection and guarantee long-term reliability.

Standard System Capacities

150L

150 L System

Suitable for 2–3 persons

200L

200 L System

Suitable for 3–4 persons

300L

300 L System

Suitable for 4–6 persons or light commercial use

Configuration Logic

150 L & 200 L systems: single flat plate collector
300 L system: dual flat plate collectors
Expansion: multiple systems can be installed in parallel

This modular logic allows capacity expansion without redesigning hydraulic or structural layouts, reducing engineering risk.

Key Technical Parameters (Overview)

The table below provides a quick technical overview for EPCs, distributors, and technical buyers to confirm system suitability at a glance.

Item

SWH-150L

SWH-200L

SWH-300L

Tank capacity

150 L

200 L

300 L

Collector area

1.87 m²

2.40 m²

3.74 m²

Collector configuration

1 pc

2 pcs

System principle

Pressurized thermosiphon

Tank option

Stainless / Enamel

Auxiliary heating

2.0 kW

Installation

Roof mounted

System Design Philosophy – Engineering-Driven, Not Marketing-Driven

The SOLETKS flat plate integrated system is developed based on engineering-driven decision making, not short-term marketing trends.

Why Natural Circulation Matters

In residential and light commercial domestic hot water applications, long-term reliability is more important than peak laboratory efficiency.

→ Operate without pumps during solar collection

→ Eliminate common mechanical failure points

→ Reduce maintenance frequency

→ Deliver stable performance over decades

This approach is particularly suitable for regions with limited maintenance resources or where predictable lifecycle behavior is required.

Standardization Over Over-Customization

Instead of offering dozens of fragmented configurations, SOLETKS intentionally limits the platform to:

3 System Capacities

2 Proven Water Tank Options

This controlled standardization ensures manufacturing consistency, easier installation and servicing, and stable spare-parts availability.

Water Tank Options – Clear, Proven, Application-Driven

SOLETKS provides two standard water tank options only, each optimized for specific operating conditions.

Stainless Steel

Stainless Steel Water Tank

Food-grade SUS304 / SUS316 stainless steel liner
Hygienic and corrosion-resistant
Suitable for potable water
Recommended for normal water quality regions
Standard auxiliary electric heater: 2.0 kW

Enamel

Enamel Water Tank

Enamel-coated special steel plate liner
High-temperature fired enamel coating
Excellent resistance to corrosion and scaling
Recommended for hard-water or demanding conditions
Standard auxiliary electric heater: 2.0 kW

Working Principle – Thermosiphon Circulation Without External Power

The system operates based on the thermosiphon principle.

Natural Circulation Process

Solar radiation is absorbed by the flat plate collector
Water inside the collector heats up and becomes less dense
Hot water rises naturally into the upper part of the storage tank
Cooler water flows downward back into the collector
Continuous circulation forms automatically

Circulation System Options

● Water circulation system for non-freezing regions

● Jacket / medium circulation system for freezing regions using antifreeze medium

Flat Plate Solar Collector – Stable Performance in Real Conditions

The flat plate solar collector is engineered for stable real-world operation, not only laboratory conditions.

Key Features

Selective absorber coating (blue film or black film)
High solar absorptivity and low thermal emissivity
Tempered glass cover for durability
Optimized absorber flow channels

Collector area is carefully matched to tank volume to avoid overheating or underperformance.

Safety & Protection Design – Integrated at System Level

Safety is built into the system architecture rather than added later.

Integrated Safety Components

T/P Relief Valve

Temperature & pressure relief valve

Safety Valve

Over-pressure protection

Check Valve

Prevents reverse flow

Controller Protection

Auxiliary heating protection

Installation Concept & Lifecycle Perspective

The SOLETKS flat plate integrated system is designed to be installer-friendly and lifecycle-efficient.

Installation Advantages

Modular Structure

Galvanized steel mounting structure

Clear Assembly Logic

Mechanical assembly logic

Roof Installation

Standard roof installation concept

Minimal Adjustment

Minimal on-site adjustment

Lifecycle Benefits

Fewer mechanical components
Lower maintenance frequency
Predictable operating costs

Decision Guide – When This System Is the Right Choice (and When It Is Not)

Choosing a solar hot water system is a technical and economic decision, not simply a product comparison.

The SOLETKS flat plate integrated solar water heater is designed for specific application profiles, and understanding these boundaries is essential for long-term system success.

Recommended Application Scenarios

The SOLETKS flat plate integrated system is particularly suitable for:

Residential

Residential Domestic Hot Water

Single-family houses and villas
Apartment units with independent hot water demand

Why it works well:

Predictable daily hot water usage patterns
Storage-based system matches morning/evening peaks
Minimal operational intervention required

Light Commercial

Light Commercial Applications

Guesthouses and small hotels
Student dormitories and staff housing
Clinics and small healthcare facilities

Engineering advantages:

Modular capacity expansion through parallel systems
Redundancy improves operational reliability
Lower maintenance complexity compared to centralized systems

Reliability Focus

Projects Prioritizing Long-Term Reliability

Locations with limited technical maintenance resources
Users seeking low total cost of ownership (TCO)
Applications where operational stability is more critical than peak output

Scenarios Where This System Is Not Recommended

Being transparent about system limitations is part of responsible engineering.

The SOLETKS flat plate integrated system is not the optimal solution for:

× Large-scale industrial processes requiring continuous, high-flow hot water

× Centralized district heating or boiler-replacement systems

× Applications demanding instantaneous hot water without storage

× Processes with highly variable or unpredictable thermal loads

In such cases, centralized solar thermal fields, hybrid systems, or boiler-assisted solutions may be more appropriate.

Climate & Market Adaptation

The system is designed for global operating conditions.

Climate Adaptation

● High solar irradiation regions
● Temperate climates
● Freezing regions (jacket circulation option)

Market Adaptation

● Europe
● Middle East & North Africa
● Africa & Latin America
● Asia-Pacific

Parallel Installation & System Expansion

For higher hot water demand, multiple systems can be installed in parallel.

Parallel systems provide:

Flexible capacity expansion
Built-in redundancy
Improved operational stability

Typical applications include: hotels, dormitories, and commercial buildings.

Quality Assurance, Warranty & Lifecycle Support

The long-term reliability of a solar thermal system depends not only on design, but also on manufacturing discipline and lifecycle support.

Quality Assurance

SOLETKS applies standardized quality control procedures throughout:

Material selection
Welding and assembly
Pressure and safety testing
Final system inspection

Each system configuration follows defined production and inspection protocols to ensure consistent quality across batches.

Warranty Policy

3 Years

Main system components (collector, tank, mounting structure)

1 Year

Functional accessories (controller, electric heater, fittings)

Warranty terms are clearly defined and aligned with international export practices.

Lifecycle Support

Beyond warranty, SOLETKS provides:

Technical documentation and training
Long-term spare parts availability
Engineering support for system optimization

This lifecycle-oriented approach ensures that systems remain serviceable and economically viable well beyond the initial warranty period.

Why Choose SOLETKS Solar – Engineering Capability You Can Rely On

Choosing a solar thermal system supplier is a long-term partnership decision.

SOLETKS Solar differentiates itself through:

Engineering-Driven Product Development

System-level design rather than component-level optimization
Focus on real-world operating conditions
Continuous improvement based on field feedback

Manufacturing Consistency

Standardized production processes
Stable quality across large volumes
Predictable delivery schedules for projects

Export-Oriented System Thinking

Adaptation to different climates and water qualities
Clear documentation for international installers
Experience supporting EPC and distributor partners

Global Partnership Opportunities

SOLETKS Solar welcomes cooperation with:

Distributors

EPC Contractors

Solar Thermal System Integrators

Partner Support

Technical training

Project configuration assistance

Marketing and sales support

OEM / ODM cooperation

Get Technical Support & Project Consultation

Download detailed technical datasheets
Request project quotations
Discuss distributor and partnership opportunities

Frequently Asked Questions

Is this system pressurized?

Yes, it is a fully pressurized domestic hot water system.

Does the system require electricity to operate?

No electricity is required for solar operation. Electricity is only needed for auxiliary heating when necessary.

What is the difference between stainless steel and enamel tanks?

Stainless steel tanks focus on hygiene and versatility, while enamel tanks are optimized for hard water and demanding conditions.

Can the system work in winter?

Yes, the system is designed for year-round operation, depending on local climate conditions.

Can multiple systems be installed together?

Yes, systems can be connected in parallel for larger hot water demand.

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