Aquastor Sigma 400

Aquastor Sigma

High Flow Unvented Hot Water Cylinders

The Aquastor Sigma range of unvented indirect hot water cylinders are ideal for high demand applications and offer an all stainless steel construction to the highest standards, with a maximum operating pressure of 4.5 bar.

The Sigma range has been designed with higher demand flow rates in mind and features 1 " BSP connections.

Available in a range of cylinder sizes with an ErP B classification.

Application

Domestic applications requiring a high performance unvented hot water cylinder with capacities up to 500 litres.

  • 1 " hot and cold water connections
  • ½" temperature and pressure relief valve
  • 4.5 bar maximum operating pressure
  • 3 kW immersion heater
  • 22 mm high performance heating coil

Technical Specification

General
Product code 44856
Guarantee 2 years (internal cylinder 25 years)
WRAS approval 1410052
Approvals BBA, CE, WRAS, KIWA, ISO, WRC
Features
Capacity - total (litres) 400 litres
Coils Single
Coil rating 27.0 kW
ErP class B
External expansion vessel size 80 litres
Material
Inner cylinder Duplex stainless steel
Outer casing P200 Plastisol
Performance
Standing heat loss @ 65 °C (kW/24h) 1.73 kW/24h
Reheat time after 70% draw off 40 mins
Time to heat from cold to 65 °C 57 mins
Maximum operating pressure 4.5 bar
Connections
Connection - cold water feed 1 " BSP M
Connection - DHW 1 " BSP M
Connection - primary 22 mm
Electrical
Power supply/phase/frequency 230 V a.c./1/50 Hz
Power consumption - P1 (watts) 3 kW
Physical
Width 755 mm
Depth 755 mm
Height 1640 mm
Weight (including fittings) 68 Kg
Weight (filled) 468 Kg

Product Variants
Part no Description
44789 SAS 305
44856 SAS 400
44790 SAS 500