NISS HSI d.o.o. is a reliable and stable partner specialized in installation works in the fields of water, heating, and ventilation systems. Based in Celje, Slovenia, our operations successfully extend to the markets of Germany and the Netherlands, where we participate in the realization of high-quality, long-term projects.

We have extensive experience working on large and demanding projects across multiple countries, where we have proven our expertise, responsibility, and ability to meet the highest standards of investors and partners.

In addition to installation services, we also provide welding, metalwork, and assembly, offering our clients a complete and reliable solution in one place.

Our team consists of dedicated and responsible professionals who work in a positive and collaborative environment. We believe that the success of every project is directly connected to employee satisfaction, which is why we foster a workplace without stress and tension – an environment where everyone feels like part of the team.

In our work, we use proven and high-quality systems from renowned manufacturers such as Geberit, Viega, and TECE, ensuring reliability, safety, and a high standard of execution.

We are focused on long-term partnerships, both with our clients and our employees. Our goal is to be recognized as a company that stands behind its word – a reliable partner offering stability, quality, and a professional approach to every project.