Hot Water Air Handling Units London

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In the fast-paced and demanding environment of London, maintaining a comfortable and efficient indoor climate is crucial for businesses and residential properties alike. The innovative solution to this challenge comes in the form of hot water air handling units. These cutting-edge systems effectively circulate hot water to regulate the temperature and humidity of indoor environments, ensuring optimal comfort and air quality. With their unparalleled performance and energy efficiency, hot water air handling units have become the go-to choice for discerning individuals and organizations seeking top-notch climate control solutions in the bustling city of London.

Benefits of Hot Water Air Handling Units

Improved energy efficiency

Hot water air handling units provide improved energy efficiency compared to traditional air handling units. The hot water coil within the unit allows for efficient heating of the air, reducing the energy required to achieve the desired indoor temperature. This can result in significant cost savings on energy bills.

Lower operating costs

As mentioned, the energy efficiency of hot water air handling units leads to lower operating costs. By using hot water to heat the air, less electricity or fuel is needed to maintain a comfortable indoor environment. This can be especially beneficial in large commercial buildings where the heating and cooling requirements are substantial.

Better indoor air quality

Hot water air handling units also contribute to better indoor air quality. The use of hot water coils helps to eliminate moisture from the air, reducing the risk of mold and mildew growth. Additionally, these units often come with built-in filters that can remove pollutants, dust, and allergens from the air, improving overall air quality and creating a healthier environment.

Flexible and easily installed

Hot water air handling units are known for their flexibility and ease of installation. They can be designed and customized to fit various spaces and can be easily integrated into existing HVAC systems. This makes them a popular choice for both new construction projects and retrofitting existing buildings.

Reduced noise levels

Hot water air handling units are engineered to minimize noise levels. The fan within the unit is typically equipped with noise-reducing features to ensure quiet operation. This is especially important in environments that require low noise levels, such as hospitals, hotels, and educational institutions.

Types of Hot Water Air Handling Units

Single skin units

Single skin hot water air handling units are the most basic type of unit available. They consist of a single outer shell without any additional insulation or double-skin construction. While they may be more cost-effective, they have lower thermal insulation properties and may result in higher energy consumption.

Double skin units

Double skin hot water air handling units feature an additional layer of insulation between the inner and outer shells. This provides better thermal insulation, reducing heat loss and improving energy efficiency. These units are generally more expensive than single skin units but offer greater energy savings in the long run.

Horizontal units

Horizontal hot water air handling units are designed to be installed horizontally, either suspended from the ceiling or placed at ground level. They are commonly used in applications where space is limited, such as small commercial buildings or areas with low ceiling height.

Vertical units

Vertical hot water air handling units are designed to be installed vertically, typically against a wall. These units are suitable for spaces with limited floor space but ample wall space. They are commonly used in applications such as hotels, hospitals, and schools.

Rooftop units

Rooftop hot water air handling units are designed to be installed on the roof of a building. These units are self-contained and have the advantage of freeing up interior space. They are commonly used in commercial buildings and industrial facilities.

Components of Hot Water Air Handling Units


Coils are a critical component of hot water air handling units. They consist of a serpentine arrangement of pipes filled with hot water. The air passing over the coils is heated as it comes into contact with the hot water within the pipes. Coils can be made of various materials, such as copper or aluminum, and their design and surface area directly impact the heating efficiency of the unit.


Fans in hot water air handling units are responsible for circulating air throughout the system. They draw in ambient air and push it through the coils, where it is heated or cooled, depending on the desired temperature. The fans are typically equipped with variable speed drives to allow for better control and energy efficiency.


Filters in hot water air handling units are used to remove airborne particles and pollutants from the air. They help to improve indoor air quality by capturing dust, pollen, allergens, and other contaminants. Filters need to be regularly replaced or cleaned to ensure proper airflow and maintain optimal performance.


Dampers are used in hot water air handling units to control airflow and regulate the distribution of heated or cooled air. They can be manually or automatically operated and are essential for achieving proper temperature control and zoning within a building.

Control system

The control system in hot water air handling units is responsible for monitoring and regulating the unit’s operation. It allows for precise control over temperature, airflow, and humidity levels. Advanced control systems can also integrate with building management systems, providing centralized monitoring and control of multiple units.

Installation and Maintenance of Hot Water Air Handling Units

Proper location and sizing

Proper location and sizing are crucial for the efficient installation of hot water air handling units. The units should be installed in a well-ventilated area that allows for easy access for maintenance and repairs. Sizing the units correctly is essential to ensure optimal performance and prevent overworking the unit.

Installation process

The installation process of hot water air handling units typically involves connecting the unit to the existing ductwork and piping system. It also includes electrical wiring and the setup of the control system. Installation should be carried out by experienced HVAC professionals to ensure proper operation and compliance with safety regulations.

Regular maintenance

Regular maintenance is necessary to keep hot water air handling units functioning at their best. This includes cleaning and inspecting coils, fans, and filters to remove any accumulated dirt or debris. Dampers should be regularly checked for proper operation and calibrated if needed. Additionally, the control system should be tested and calibrated to ensure accurate temperature control.

Common troubleshooting

Inevitably, hot water air handling units may encounter issues over time. Common troubleshooting includes identifying and addressing issues such as air leaks, blockages in the coil or ductwork, motor or fan malfunctions, and control system errors. Regular inspections and vigilant monitoring can help identify any potential problems early on and prevent major breakdowns.

Factors to Consider when Choosing a Hot Water Air Handling Unit

Capacity and airflow requirements

When choosing a hot water air handling unit, it is essential to consider the capacity and airflow requirements of the space it will be serving. Understanding the heating and cooling demands of the area will ensure that the unit can provide adequate airflow and maintain the desired temperature.

Energy efficiency rating

Energy efficiency should be a top consideration when selecting a hot water air handling unit. Look for units that have high energy efficiency ratings, such as those with ENERGY STAR certification. These units will consume less energy, resulting in lower operating costs and reduced environmental impact.

Space availability

The available space for installing the hot water air handling unit is another crucial factor to consider. Different units have varying footprints, and it is important to choose a unit that will fit within the designated space without causing any obstructions or compromises in airflow.


Budget considerations are always important when making any HVAC equipment purchase. It is worth investing in a high-quality unit that may have a higher upfront cost but offers long-term energy savings and reliability. Consider the overall lifecycle cost rather than just the initial purchase price.

Future expansion needs

Anticipating future expansion needs is important, especially in commercial or industrial settings. Choosing a hot water air handling unit that can accommodate increased heating and cooling demands as the building expands or changes its purpose will save time and money in the long run.

Applications of Hot Water Air Handling Units

Commercial buildings

Hot water air handling units are commonly used in commercial buildings such as office complexes, shopping centers, and restaurants. Their energy efficiency, flexibility, and ability to provide comfortable indoor environments make them a popular choice for a wide range of commercial applications.

Hotels and resorts

Hot water air handling units are essential for maintaining a comfortable environment in hotels and resorts. They provide efficient heating and cooling, ensuring guest satisfaction and creating a pleasant stay experience. Additionally, their ability to filter air improves indoor air quality, contributing to the overall health and well-being of guests.

Hospitals and healthcare facilities

Hot water air handling units are crucial in healthcare facilities where indoor air quality and temperature control are paramount. They are designed to provide clean, filtered air while maintaining strict temperature and humidity levels. This helps to create a healthy and safe environment for patients, staff, and visitors.

Schools and educational institutions

Hot water air handling units are commonly used in schools and educational institutions to ensure a comfortable and conducive learning environment. They provide consistent temperature control and help to reduce allergens and pollutants in the air, promoting better indoor air quality for students and staff.

Industrial facilities

Hot water air handling units are also used in industrial facilities where specific temperature and humidity control are required. These units can be customized to meet the unique needs of various industrial processes, helping to maintain optimal conditions for manufacturing, testing, and storage.

Hot Water Air Handling Units vs. Electric Air Handling Units

Energy efficiency

Hot water air handling units are generally more energy-efficient compared to electric air handling units. The use of hot water allows for efficient heat transfer, reducing the energy consumption required to achieve the desired temperature. Electric air handling units rely solely on electrical resistance heating elements, which can be less energy-efficient.


Hot water air handling units tend to be more cost-effective in the long run. While they may have a higher initial purchase and installation cost, their energy efficiency and lower operating costs result in significant savings over time. Electric air handling units may have lower upfront costs, but their higher energy consumption can drive up operating expenses.

Environmental impact

Hot water air handling units have a lower environmental impact compared to electric air handling units. Their energy efficiency helps to reduce greenhouse gas emissions associated with energy consumption. Additionally, hot water air handling units can utilize renewable energy sources such as solar thermal or heat recovery systems, further reducing environmental impact.

Durability and reliability

Hot water air handling units are generally known for their durability and reliability. They have fewer moving parts compared to electric air handling units, reducing the risk of mechanical failures. The hot water coils are not subjected to the same wear and tear as electric heating elements, resulting in longer lifespan and fewer maintenance requirements.

Flexibility and customization options

Hot water air handling units offer greater flexibility and customization options compared to electric air handling units. They can be integrated into existing hot water or steam systems, allowing for easy retrofitting. Additionally, hot water air handling units can be tailored to specific heating and cooling requirements, ensuring optimal performance and comfort.

Maintenance Tips for Hot Water Air Handling Units

Regular filter replacement

Regular filter replacement is crucial for maintaining the performance and air quality of hot water air handling units. Filters should be checked and replaced according to the manufacturer’s recommendations or more frequently in high-pollution environments. Dirty or clogged filters can restrict airflow and reduce the efficiency of the unit.

Cleaning coils and fans

Coils and fans in hot water air handling units should be cleaned periodically to remove dirt and debris. Accumulated dirt on the coils can reduce heat transfer efficiency, while debris on the fan blades can cause imbalance and decrease fan performance. Cleaning should be done carefully following manufacturer guidelines to avoid damage.

Inspecting and balancing dampers

Dampers should be regularly inspected to ensure they are functioning properly and are properly balanced. Damaged or misaligned dampers can disrupt airflow and lead to temperature inconsistencies within the building. Balancing dampers ensures optimal air distribution and temperature control.

Checking for leaks and duct damage

Regularly checking for leaks or damage in the hot water air handling unit’s ductwork is essential. Leaks can result in energy loss and inefficient operation, while duct damage can lead to airflow disruptions and reduced performance. Prompt repair or sealing of any leaks or damage is necessary to maintain optimal operation.

Monitoring control system

The control system of hot water air handling units should be regularly monitored to ensure accurate temperature control and proper operation. Check for any error codes or abnormal settings and address them promptly. Regularly calibrate sensors and controllers to maintain accurate temperature readings and efficient system performance.

Common Issues with Hot Water Air Handling Units

Poor indoor air quality

Poor indoor air quality can be a common issue in hot water air handling units if filters are not regularly maintained or replaced. Clogged filters can allow dust, allergens, and pollutants to circulate within the building, negatively impacting the health and comfort of occupants. Regular filter maintenance is essential to prevent this issue.

Inadequate temperature control

Inadequate temperature control can occur if the hot water air handling unit is not properly sized for the space or if there are issues with the control system. If the unit is undersized, it may struggle to heat or cool the area adequately. Control system malfunctions can also result in inconsistent temperature control. Proper installation, sizing, and regular maintenance can address these issues.

High energy consumption

High energy consumption can be a result of various factors, including improper system sizing, clogged coils or filters, or control system errors. An improperly sized unit may be constantly overworking to meet the heating or cooling demands, leading to higher energy consumption. Regular maintenance and prompt resolution of any issues can help reduce energy consumption.

Noise and vibration problems

Hot water air handling units should operate quietly without excessive noise or vibration. If there are noise or vibration issues, it could indicate imbalanced fans, loose components, or worn-out bearings. These issues should be addressed promptly to prevent further damage and ensure a comfortable and noise-free environment.

Water leakage

Water leakage can occur if there are issues with the hot water air handling unit’s coil or condensate drain system. Leaks can cause damage to the unit and surrounding structures and may result in mold growth or other moisture-related issues. Regular inspection and maintenance of the coil and drain system can prevent water leakage.

Finding a Reliable Hot Water Air Handling Unit Supplier

Research and recommendations

When searching for a reliable hot water air handling unit supplier, it is essential to conduct research and seek recommendations. Look for suppliers with a good reputation in the industry and positive customer reviews. Seek recommendations from HVAC professionals or colleagues in the same industry who have experience with hot water air handling units.

Quality certifications and warranties

Ensure that the hot water air handling unit supplier holds necessary quality certifications and offers warranties for their products. Quality certifications such as ISO 9001 indicate that the supplier follows recognized quality management standards. Warranties provide assurance that the supplier stands behind their products and will provide support if any issues arise.

Product customization options

Consider the level of customization options offered by the hot water air handling unit supplier. Different applications may require specific design or performance features. Choose a supplier that can tailor their units to meet your specific needs and provide expert advice on the best solution for your requirements.

Installation and after-sales service

A reliable hot water air handling unit supplier should offer professional installation services and comprehensive after-sales support. From initial consultation to installation and ongoing maintenance, choose a supplier that can provide expertise and peace of mind throughout the entire process. Prompt and responsive after-sales service is also crucial in case any issues or queries arise.

Customer reviews and testimonials

Review customer reviews and testimonials about the hot water air handling unit supplier to gauge their reputation and customer satisfaction. Positive feedback and testimonials from previous customers serve as a good indication of the supplier’s reliability, quality of products, and level of customer service.

In conclusion, hot water air handling units provide numerous benefits, including improved energy efficiency, lower operating costs, better indoor air quality, flexibility in installation, and reduced noise levels. They are available in various types, including single skin and double skin units, horizontal and vertical units, and rooftop units. The key components of hot water air handling units include coils, fans, filters, dampers, and control systems. Proper installation, regular maintenance, and consideration of factors like capacity, energy efficiency rating, space availability, budget, and future expansion needs are important when choosing a hot water air handling unit. These units have wide applications, including commercial buildings, hotels, hospitals, schools, and industrial facilities. When compared to electric air handling units, hot water air handling units offer better energy efficiency, cost-effectiveness, environmental impact, durability, and flexibility. Proper maintenance tips include regular filter replacement, cleaning coils and fans, inspecting and balancing dampers, checking for leaks and duct damage, and monitoring the control system. Common issues with hot water air handling units include poor indoor air quality, inadequate temperature control, high energy consumption, noise and vibration problems, and water leakage. To find a reliable hot water air handling unit supplier, conduct thorough research, check for quality certifications and warranties, consider customization options, evaluate installation and after-sales service, and read customer reviews and testimonials. Overall, hot water air handling units are an excellent choice for providing efficient and comfortable heating and cooling solutions in various applications.

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