Hybrid Hot Water Boilers

What Is a Hybrid Hot Water Boiler?

A hybrid hot water boiler is a boiler system capable of using more than one energy source to produce hot water. In the Agro Heat Hybrid Series, natural gas burner technology and electric heating technology are integrated into the same system.

This configuration prevents the facility from depending on a single energy source. Electric heating can be used when electricity is more advantageous for the facility, while the natural gas system can be activated when required. Depending on the system configuration, both energy sources can also be managed as part of the same heating strategy.

This feature provides an important operational advantage, particularly for greenhouse facilities where energy prices fluctuate and uninterrupted heating is critical.

Hybrid Heating Technology Combining Natural Gas and Electricity

Energy costs represent one of the major operating expenses in industrial heating systems. In conventional systems that rely on a single energy source, businesses are directly affected by fluctuations in the price of that energy source.

Hybrid boiler technology gives operators the flexibility to manage the energy source according to operating conditions.

Electric heating can be utilized during periods when electricity costs are advantageous or when the facility generates its own electricity. When heating demand or operating conditions change, the natural gas heating system can be used.

The objective is therefore not simply to produce hot water, but to make the same heating demand manageable across different energy sources.

3-Pass Scotch Type Hybrid Boiler Design

The Agro Heat Hybrid Hot Water Boiler features a fully cylindrical, 3-pass, wet-back Scotch type boiler design.

In the 3-pass design, hot combustion gases travel through three separate passes along the boiler's heat transfer surfaces. This configuration helps transfer usable heat from the flue gases to the boiler water and enables effective utilization of the available heat transfer surfaces.

In the wet-back design, the rear combustion chamber is surrounded by water. This configuration contributes to controlled heat transfer in high-capacity hot water systems designed for continuous operation.

Using Hybrid Boilers for Greenhouse Heating

Greenhouses require more than simply achieving a high temperature; the indoor environment must be maintained within a defined and stable temperature range. Day-to-night variations in outdoor temperature, seasonal conditions and the temperature requirements of the cultivated crop can continuously change the heating load.

The Agro Heat Hybrid Series has been developed to respond to these variable heating requirements.

The system can be used in:

• Modern greenhouse facilities,
• Industrial greenhouse projects,
• Soilless and hydroponic farming facilities,
• Seedling and nursery production facilities,
• Agricultural production facilities with high heating demands.

With a capacity range extending from 116 kW to 50,000 kW, the appropriate boiler capacity can be determined through engineering calculations for greenhouse projects of different scales.

Advantages of Hybrid Hot Water Boilers

Energy source flexibility: Natural gas and electricity alternatives prevent the facility from being dependent on a single energy source.

Energy cost management: The appropriate energy source can be utilized according to operating conditions and energy prices.

Heating continuity: Having an alternative energy source supports operational continuity in facilities such as greenhouses where continuous heating is critical.

Wide capacity range: The 116–50,000 kW range enables small, medium and large-scale projects to be evaluated within the same product family.

3-pass design: Combustion gases travel through three passes along the heat transfer surfaces, supporting effective transfer of available thermal energy to the boiler water.

1–16 bar operating pressure: Provides engineering flexibility for different facility requirements and hot water heating systems.

Hybrid Boilers for Greenhouses with Solar Energy Systems

Hybrid boiler technology can also be considered for agricultural facilities with on-site electricity generation infrastructure. In greenhouse operations equipped with solar power systems, the electricity generated on-site can be utilized for heating through an appropriately engineered system, contributing to more flexible energy management.

When electricity generation is insufficient or heating demand increases, the natural gas heating system can be activated to meet the required thermal load.

For this reason, hybrid hot water boilers provide a strong alternative for greenhouse investments seeking to address electrification, energy cost control and heating continuity within the same project.

Why Choose Ekotek Hybrid Hot Water Boilers?

Ekotek Heat Technology has been manufacturing industrial boilers and heating systems since 1999. Boiler systems developed and manufactured at its production facility in Aydın, Türkiye are exported to international markets.

In the Agro Heat Hybrid Series, Ekotek's experience in conventional Scotch type boiler manufacturing is combined with electric heating technology within a single system.

A heating capacity of 116–50,000 kW, an operating pressure range of 1–16 bar, a 3-pass Scotch type configuration and natural gas + electric hybrid energy technology make the Agro Heat Series particularly suitable for consideration in large-scale greenhouse heating projects.

Low NOx and Reduced Carbon Emissions with Hybrid Heating

By integrating natural gas and electricity within the same heating system, the Agro Heat Hybrid Hot Water Boiler contributes not only to energy cost management but also to strategies aimed at reducing NOx and carbon emissions at industrial and agricultural facilities.

During electric operation, no fuel combustion takes place inside the boiler; therefore, no combustion-related NOx emissions are generated at the boiler itself. Meeting part of the heating demand with electricity can also help reduce natural gas consumption and the associated direct carbon emissions.

The environmental benefits of hybrid heating can become more significant when electricity is supplied from renewable energy sources such as solar power. Utilizing electricity generated by photovoltaic systems for boiler heating can help reduce fossil fuel consumption and contribute to lowering the facility's overall carbon footprint.

Emission Advantages of the Hybrid System

• No combustion-related NOx emissions are generated at the boiler during electric operation.
• Meeting part of the heating load with electricity can help reduce natural gas consumption.
• Lower natural gas consumption can contribute to reducing direct combustion-related CO₂ emissions.
• Integration with renewable electricity sources such as solar power supports reduced dependence on fossil fuels.
• Flexible management between natural gas and electricity allows businesses to evaluate energy costs and emission reduction targets together.

For this reason, the Agro Heat Hybrid Series is more than a hot water boiler that combines alternative energy sources. It is a hybrid heating solution developed for modern greenhouse projects targeting low NOx emissions, reduced carbon emissions and renewable energy integration.

Technical Note: Actual carbon emission reductions depend on the carbon intensity of the electricity source, the electricity-to-natural-gas operating ratio, annual operating hours and the facility's total heating load.