ABOUT US With over 40 years of experience, Idrosun SA is today a well-established player in the wellness and building technology sector. Its story began in 1981 with a family vision: to offer tailored solutions that strike a balance between technical innovation and human care. Idrosun SA was born from the intuition of Willi Maag, who founded the company with the goal of uniting craftsmanship, technical expertise, and design quality. Over the years, the company has expanded its fields of operation, integrated advanced technologies, and established itself as a trusted partner for private clients, engineers, architects, designers, and businesses. Today, the company is led by Simon Maag, who took over from his father and now fully owns the company, continuing its development with a forward-looking approach. We are mainly active in Ticino , Engadin , the Zurich/Zug region , and Northern Italy , managing bespoke projects in residential, hospitality, and commercial settings. Thanks to our multilingual team, we communicate daily with clients and partners in Italian, German, English, and French , ensuring smooth and professional collaboration across multiple markets. From the very beginning, our way of working has stood out for its complete and structured method: every project is followed through all its stages – from the first consultation to the execution and long-term assistance – with consistency and care. An approach that has shaped the company’s identity and continues to define how we work. A story that keeps evolving, building new spaces of well-being every day. WE FOLLOW PROJECT STEP BY STEP We are dedicated to the well-being, comfort, and energy efficiency of our clients – both private and professional – combining cutting-edge technology with refined design. We manage every project in all its phases, from initial consultation to maintenance, ensuring rapid intervention and continuous support thanks to our emergency service active 24/7, 365 days a year. TAILORED DESIGN We create exclusive, custom-made environments that combine aesthetics and functionality. CONSTRUCTION AND INSTALLATION From construction to installation, we follow every step with precision. MAINTENANCE AND REPAIR Professional service to ensure durability and optimal performance. TECHNICAL CONSULTING AND AFTER - SALES Expert support for every need, even after installation. PRODUCT AND ACCESSORY SALES A complete range of solutions for the care and management of technical systems. OUR SERVICES Each project begins with the desire to create authentic, lasting, and personalized well-being. Our solutions combine technical know-how with aesthetic sensibility to shape functional and welcoming spaces, perfectly balanced between technology and design. Our work is structured into five main areas, all developed with the same focus on quality, efficiency, and sensory experience: WELLNESS Indoor and outdoor pools, whirlpools and spa tubs, saunas, cryo saunas and Turkish baths, cold plunge systems, biopools and natural swimming ponds. WATER TREATMENT Pumping stations and pressure boosting systems, treatment of grey and clear water, softeners and reverse osmosis systems, water distribution and irrigation systems, advanced filtration systems. HEATING AND COOLING Heat pumps and low-temperature systems, radiant heating and cooling systems, solar thermal systems for hot water production. VENTILATION Controlled mechanical ventilation systems, air treatment and dehumidification solutions, heat recovery for improved energy efficiency. AUTOMATION AND CONTROL Electrical panels and regulation systems, advanced home automation and remote control, photovoltaic systems for energy production. PRODUCTS AND ACCESSORIES Chemical products for water treatment, cleaning robots and accessories for pools and wellness areas, pool covers and safety solutions.

Consulting - Planning - Execution - Service We advise you on site and plan your heating system renovation according to the existing situation. Your wishes, the conditions on site and our technical and professional know-how flow into your project. After taking stock of the existing situation, we will work out the optimum solution for the renovation and renewal of your heating system. OilGasHeat pumpsSolarWoodBoiler renovations and new installationsRadiator installationFloor heating systemsBoiler installations and decalcification About us Business owner / heating installerAt Thomas Hänzi Heizungen+Reparaturen GmbH everything comes from one source. Thomas Hänzi carries out consulting and planning work on your premises or in his workshop in Herrliberg. As a heating installer/service technician, he is on the road for you, installing and repairing heating systems in all energy sectors. Office With the support of his wife, telephone and customer service are very important in the office area. Scheduling and coordinating upcoming work and appointments are just as much a part of her job as handling general and daily office tasks.

Founded in 2017, we have already implemented over 1000 orders. Our customers include private individuals as well as small, medium-sized and large companies and public institutions such as municipalities, the canton and the federal government. We feel particularly at home in complex systems and with high technical requirements. Your advantage is our continuous training. We are responsible for: INSTALLATIONS ELECTRICAL INSPECTIONS ELECTRIC MOBILITY

BILLING OF ELECTRICAL ENERGY FROM CHARGING STATIONS FOR ELECTRIC VEHICLES Our Energy billing service stands for transparency and efficiency in energy billing. We offer precise and uncomplicated billing of energy consumption for both private and commercial customers. Our advanced billing systems ensure that you always have a clear overview of your energy costs. With Arfos Mobility you get a reliable and user-friendly solution for energy management, optimized for today's requirements for sustainable energy supply and electromobility. ZEV - MEMBERSHIP FOR OWN CONSUMPTION" FOR ARFOS MOBILITY Our ZEV service enables communities to use their energy efficiently and sustainably. We offer tailor-made solutions for self-consumption associations that enable locally generated energy to be shared and billed within the community. By optimizing the use of renewable energy sources, we contribute to the energy transition and support you in becoming more independent of traditional energy sources. With Arfos Mobility, energy community becomes a practical and economical reality. CHARGING STATION LEASING CHARGING STATION RENTAL Benefit from our charging station leasing option to get started with electromobility without a high initial investment. We offer flexible leasing models for charging stations, tailored to your individual needs and locations. Our solutions not only include the provision of charging stations, but also their maintenance and service. This means you can concentrate on your core business while we ensure that your charging stations are always operational. With Arfos Mobility, electromobility becomes accessible and convenient for everyone. SOLAR OPTIMIZATION FROM THE PROFESSIONAL Our solar optimization service maximizes the efficiency of your solar systems and enables you to make optimal use of renewable energy. We offer advanced control solutions that improve the performance of your solar systems and maximize your self-consumption. By adapting to flexible tariff models, you can reduce your energy costs while contributing to sustainability. With Arfos Mobility you receive a tailor-made solution to fully exploit the advantages of your solar systems and optimize your energy balance. Together with our partners, we can already react to time-controlled tariffs, control your system based on them and precisely implement the billing of energy costs. Thanks to the product we use, we are also able to control your heating, the charging station or any other consumer. Ask us about a solution that is right for you.

Kather Sanitär Heizung GmbH (Amriswil) delivers plumbing, heating and ventilation services across Switzerland. Since 2003, we support private, commercial and industrial projects—from single-family homes to large-scale builds. We handle planning, installation, upgrades, maintenance and fast troubleshooting. Our services include sanitary installations, bathroom renovations, modern heating systems (heat pumps, oil, gas, wood), underfloor heating, radiators, and ventilation solutions for residential and commercial properties, including heat recovery systems. Expect high-quality materials, efficient processes and personal service.