hotels, camping sites and bathhouses, which are all mostly used in warm weather periods. The issues of winter maintenance to protect solar panels from winter frost are wellknown. However, this problem has been definitively resolved recently by our Sunnyday ‘On the rocks’ solar panel (Sunnyday SF), which ensures the same performance of the conventional panel (Sunnyday SD), but has a special flattened shape of the channels (5.5 mm wide) that allows them to absorb the expansion due to frozen water without breaking. Sunnyday is built with a particularly robust copolymer polypropylene mix, compatible with food uses and resistant to aggressive chemicals. These features allow water to be directly heated inside the panel, whether it is sanitary water or a swimming pool water, with considerable benefits in terms of simplicity, cost and efficiency of the system. Any support base is indicated for its installation, provided there is no roughness which would damage the panels, also due to the abrasion caused by the small movements due to thermal expansion and vibration induced by the wind. The new-profile Sunnyday SF series solar panel has been certified by Eurofins according to the UNI EN 12975-1 standard, which assesses its compliance with du-
rability, reliability, and safety requirements for solar panels, and according to the UNI EN 12975-2 standard after tests conducted on the thermal performance of the panel.
SUNDROP, A NATURAL CIRCULATION KIT Sundrop is a natural circulation system for sanitary hot water, to be installed on terraces or roof terraces. It is an excellent solution for second homes and summer tourist facilities, and consists of: →→ A 200 l stainless steel corrosion-resistant tank that required no maintenance and no heat exchangers; →→ 3 Sunnyday SF Series 2000 solar panels that ensure no overheating, no scaling, no corrosion, no frost damage, no glass barriers. Moreover, these panels are more efficient than glass panels in the summer period. Sundrop is a synonym of simplicity, technology, and reliability. Having neither a thermal probe nor requiring any electronic adjustment, it only works based on the laws of physics, i.e. difference between the temperature of the water contained in the panels and that contained in the tank. Due to the properties of polypropylene, Sunnyday is a clean and efficient solar panel system: the sanitary water that passes through them remains clean, drinkable, and with no scale build up. 57
