Sigma hot water storage tanks, produced according to European Standards, combined with collectors can be used both in private houses or hotels, hospitals etc, for hot water household requirements or for central heating system support.

Sigma hot water storage tanks supply hot water either from the sun, or ( in cloudy days ) central heating system or electric power  through heat exchangers /serpentines , according to client needs .

Capacity : 120 - 1,000 lt

Jacketed inner storage tank steel ST 37-2 DIN 17100, thickness 2.5 mm.

Single or double heat exchanger

Protection: 850o C direct enameled. DIN 475313.

Insulation: polyurethane C.F.C. free, 40 kg\m², thickness 60 mm .

Magnesium anode.

Aluminum outer cover:  0.6 mm

Two places for heat sensors.

Hot water return.

Function pressure: 10 bars.

Working temperature: up to 95o C

( optional ) Electric resistance with thermostat : 2 - 4 kw