"INTRODUCTION Active use of solar radiation energy in Montenegro and Serbia is a part of the most precious history of the development of solar technologies in Europe. It represents a commercialized use of the renewable energy resources in Europe@ where recently in its most developed region??the European Union countries??more and more systems are constructed similar to the Seawater Heat Pump Assisted Multipurpose Solar System which has been successfully functioning in Budva@ Montenegro@ at the Adriatic sea coast for 25 years now. The tourist Hotel complex apartment-type Slovenska Pla?a (a view on the hotel complex apartment buildings of Slovenian Beach is given in the Figure 1) represents a unique form of tourist offer at the Adriatic coast. The entire complex with 754 rooms and 220 apartments@ was designed to have various contents that meet all the requirements of its guests. Every room has a balcony while each apartment includes a kitchen along with a dining room. Following the completion of its construction@ the facility was able to accommodate 2700 guests at a time. The major part of the accommodation area is airconditioned@ while the common areas are fully air-conditioned. The tourist complex ""Slovenian Beach"" is located near the natural beach??sandy and pebbly (Figure 2)@ both on the shore and in the sea. It stretches from the city harbor to the another hotel complex??named Park@ with the total length of 1600 m (5249.344 ft). It is characteristic for its sandbank which connects the beach with the island St. Nikola. It officially became the swimming beach in 1920@ and Czechs who were on holiday there in 1935 named it ""Slovenska pla?a"" as it is called today. The tourist complex Slovenian Beach in Budva has been intended to accommodate tourists throughout the year and it was expected to be used at least eight months a year. A decision to build the Slovenian Beach??Heat Pump assisted Solar System had been made at the Budva Hotel Touristy organization 29 years ago@ in 1980. Corresponding Construction Contract was signed one year later in 1981 and immediately after its conclusion activities regarding the system design@ selection of potential equipment and its procurement began. A very creative mechanical engineer@ HVAC system design expert Mr. Velimir Jevtic was the main designer of the system. Its construction was completed in April 1983. The system used in Slovenian Beach has total power of 3@5 MW and includes a 2.500 m2 (26@909.78 ft2) flat plate solar collectors field for water heating (Figure 3). The heat pumps (Figure 4) are designed and sized to be used for additional sanitary water heating in summer when solar radiation intensity is of too low level@ and for heating in winter@ as well as for air-conditioning during the summer. Sea water is used as heat source and heat sink for heat pump operation. Further in this paper the Slovenian Beach heat pump assisted solar system constructed in Budva at the Adriatic coast@ its technological schemes@ construction@ scenarios and regimes of control based on the solar radiation intensity measurement and solar collector field outlet water temperature@ as well as 25 years of its operation are described."