NVSN2S 280 natural circulation solar kit, composed of:
- No. 2 thermal solar collectors
- Double-wall cylinder in vitrified steel
- Universal fixing system for installation on flat roof (approx. 45° slope)
- Installation kit includes: 2 x 1-litre packs of propylene glycol and 1 x 5-litre pack of propylene glycol; 3 bar safety valve (solar circuit); 6 bar safety valve (domestic circuit); insulated stainless steel pipes for collector-cylinder connection; plumbing fittings and fasteners

Technical specifications of solar collectors
- Absorber: aluminium with selective surface, 0.5 mm thick
- Cover: tempered glass, 4 mm thick
- Dimensions (WxHxD): 2040 x 1040 x 88 mm
- Gross surface area: 2.11 m2
- Open surface area (net): 1.91 m2
- Connections (4 copper pipes): Ø22 mm
- Max working pressure: 10 bar
- Stagnation temperature: 195 °C
- Content: 1.40 litres
- Empty weight: 38 kg

Technical specifications of cylinder
- Dimensions (W x diameter): 1765 x Ø580 mm
- Material: vitrified steel
- Effective volume: 272 litres
- Protection: no. 2 magnesium anodes
- Equipped with 1.5 kW heating element
- Equipped with side inspection flange
- Max domestic circuit pressure: 6 bar
- Max solar circuit pressure: 3 bar
- Connections: G 3/4" F
- Loss: 75 W
- Energy efficiency class: C
- Empty weight: 107 kg

Technical specifications of complete kit
- Heat transfer fluid content 19.80 litres
- Complies with standard UNI EN 12976
- Solar Keymark certification