ALL THE COMFORT IN A SINGLE SOLUTION
AQUA TOWER 454C is a reversible full inverter geothermal heat pump designed for residential applications and small commercial spaces requiring high performance and maximum efficiency within compact dimensions. It integrates a complete plant room and a 250-liter domestic hot water tank into a single compact system, eliminating the need for external components and simplifying both installation and system design.
Engineered to operate with geothermal probes or groundwater systems, it can function either as a standalone unit or in cascade configuration, ensuring continuity and flexibility across different plant layouts. The system provides heating, cooling, and domestic hot water production directly within the unit, with intelligent cycle management to optimize energy consumption and guarantee constant availability.
The use of R454C refrigerant enables high performance with reduced environmental impact, in compliance with the latest regulatory requirements. Designed and manufactured in Italy, with in-house developed electronics and software, AQUA TOWER 454C is a compact, efficient, and all-in-one solution, conceived to deliver year-round comfort.
Find out more
HIGH-EFFICIENCY GEOTHERMAL TECHNOLOGY
It exploits the thermal stability of the ground to ensure constant performance and high efficiency, independent of external climatic conditions, guaranteeing reliable comfort in every season.
COMPACT BUT COMPLETE
SIMPLIFIED INSTALLATION
The internal layout and optimized connections reduce installation time, simplify hydraulic and electrical connections, and facilitate commissioning and maintenance operations.
PERFECT FOR RETROFIT
AQUA TOWER 454C is an indoor heat pump designed for the replacement of existing generators without system modifications.
It integrates easily into existing plant rooms while maintaining the existing hydraulic distribution, terminals and connections.
An ideal solution for renovation projects requiring efficiency and modernization without invasive structural interventions.
AQUA TOWER – R454C
HIGH EFFICIENCY EVEN IN COLD CONDITIONS
High efficiency even with outdoor temperatures down to –15°C, ensuring constant comfort throughout the year.
AQUA SLIM uses R454C refrigerant (GWP 146) with low environmental impact, ideal for residential applications and capable of delivering high performance even in colder climates.
INTEGRATED DOMESTIC HOT WATER AND MAXIMUM EFFICIENCY WITH MAGIS
With MAGIS, the exclusive GSI system, heat that is normally dissipated by the heat pump is automatically recovered—without waste—to produce domestic hot water up to 70°C. In TOWER AQUA units, this process takes place directly within the integrated 250-liter domestic hot water tank, which is heated while the system is operating for space heating or cooling. This allows you to produce domestic hot water with no additional energy consumption, making full use of the energy already available. The result is a constant availability of hot water, intelligent management of DHW cycles, and lower energy bills—without compromising comfort.
CASCADE MANAGEMENT, SCALABLE POWER
Up to 6 GSI heat pumps can be managed in cascade via a dedicated controller with specific control logic. The controller supervises the system and automatically modulates the units according to the required load, ensuring unit rotation.
Coordinated cascade management ensures service continuity, reliability, and high energy efficiency even in large installations.
ADVANCED CONTROL, INTELLIGENT MANAGEMENT
GSI heat pumps are prepared for remote management and supervision. The GSI CLOUD platform stores up to 13 months of operating data, enabling analysis, diagnostics, and system optimization to support service continuity.
AIER, the optional network analyzer, detects surplus energy in real time and automatically adjusts the heat pump by increasing setpoints for DHW or heating.
COMFORT AT YOUR FINGERTIPS
The product web app, paired with GSI’s KlySense app, enables clear and intuitive monitoring and control of the system from a computer, tablet, or smartphone.
An end-user menu covers everyday comfort, while a password-protected service menu provides advanced parameters for configuration and technical management.
A guided start-up wizard supports installation and commissioning step by step, reducing start-up time and limiting errors.
End users can set up to three heating and cooling levels (comfort, pre-comfort, and economy). DHW time bands and setpoints can be managed in the same way.
FULL INVERTER
Full inverter compressor with modulating heating and cooling capacity from 6 to 16 kW, adapting performance to actual demand and ensuring optimal indoor conditions, high efficiency and reduced energy consumption under all operating conditions.
Technical data
| Refrigerant Gas (GWP) | R454C (146) |
| Power Supply | Single Phase / Three Phase |
| Power range | 6kW – 11kW |
| COP (Heating B 0 °C / W 35 °C) | Up to 5,37 |
| Heating efficiency class at 55 °C | A+++ |
| Heating efficiency class during DHW production | A++ |
| EER (Cooling B +30 °C / W +18 °C) | Up to 7,12 |
Operating temperatures
| Source temperature range | W +7 °C / W +40 °C - B 0 °C / B +40 °C |
| System circuit temperature range | +7 °C / +55 °C |
| Max. DHW Temperature | Up to +70 °C |
Size, weight, noise level
| Base (Length x Width) | 735mm x 731mm |
| Minimum/maximum height | 1425mm |
| Weight | 238 kg max. |
| Noise level at 5m. distance in free field | 56 db(A) |
Monitoring
| User | WebApp |
| Technician | Cloud GSI |
| Storage | Cloud |
| Integration with other energy sources | Yes: Photovoltaic (AIER System) |
| Integration with other platforms | Yes: Modbus TCP/IP |
Available models
| Standard: Possibility of domestic hot water production through external valve |
| Magis: Dedicated integrated circuit for DHW production in addition to the optimized hydraulic circuit |
AQUA TOWER – R454C
Download area
Unit Dimensions [ZIP]
Associated accessories
Complete your product with the right accessory
Frequently Asked Questions
GSI FAQ
Which heat pump is best for my needs?
The choice of heat pump depends on various factors, including the characteristics of the building, energy needs and local climate conditions. It is advisable to consult the experts at GSI for a personalized assessment.
How much does it cost to install a heat pump?
The cost of installing a heat pump varies based on the type of system chosen, the specifics of the building and other factors. For precise cost information, it is advisable to contact GSI directly or an authorized installer.
What are the advantages of using a heat pump for home air conditioning?
The main advantages include:
- Energy efficiency: heat pumps exploit renewable sources such as air, water or soil, reducing the consumption of fossil fuels.
- Versatility: they can provide both heating and cooling, adapting to different seasonal needs.
- Reduction of emissions: they help reduce CO₂ emissions, promoting environmental sustainability.
- Integration with other systems: they can be combined with radiant systems and geothermal systems to optimize living comfort.
Do your heat pumps also work in winter with very low temperatures?
Yes, GSI heat pumps are designed to guarantee high performance even in harsh climate conditions, ensuring living comfort all year round.
Are your products compatible with existing systems?
GSI solutions can be integrated with existing heating and cooling systems, including radiant systems and air handling units.
How much can I save with a heat pump compared to a traditional system?
Using a high efficiency heat pump can lead to significant energy savings compared to traditional heating systems, thanks to the use of renewable sources.
Does GSI offer after-sales support?
Yes, GSI offers after-sales services, including maintenance and technical support to ensure the proper functioning of heat pumps and other installed systems.
How often should heat pump maintenance be performed?
Regular maintenance of heat pumps is essential to ensure efficiency and longevity. It is recommended to follow the instructions provided in the specific use and maintenance manual of the product.
The integrated Italian solution for comfort, savings and sustainability
GSI designs and manufactures climate and renewable energy solutions, from small apartments to large commercial buildings. All products are Made in Italy and equipped with integrated software to optimize energy use and reduce emissions. The goal: more comfortable, sustainable, and zero-CO₂ environments.
A world powered by high-efficiency, sustainable energy solutions
Offering customized and integrated solutions to meet the needs of each customer, both residential and commercial. Promote the spreading of a conscious and responsible energy culture, through training and information for customers. Being a recognized leader in the renewable energy sector, synonymous with reliability, quality and innovation.
A cutting-edge hub for the production of heat pumps and energy systems
The new facility, which covers an area of 3.500 square meters, represents an important step in the company’s growth and innovation path. Designed according to the most modern criteria of energy efficiency and environmental sustainability, the new headquarters houses offices, research and development laboratories, a cutting-edge production plant and an automated warehouse.
