Aquastor Sigma

Aquastor Sigma

High Flow Unvented Hot Water Cylinders

Lashings of hot water is no longer regarded as one of life's luxuries, it's what everyone expects. There is nothing as infuriating as a bath or shower that runs cold because someone has used all the hot water!


The AquaStor Sigma F1 high performance cylinder is designed to deliver large volumes of hot water at higher flow rates, to meet the demands of larger multi-bathroom properties, small hotels, guest houses and leisure facilities with multiple showers and hot water outlets.

The AquaStor Sigma F1 is able to achieve high levels of performance due to its low heat loss eco foam insulation and large volume heating coils which carry more water and deliver faster heat up times compared to other unvented cylinders which use finned or rippled coils.

The AquaStor Sigma F1 smooth bore coil system also deters lime scale build up, maintaining the cylinder's efficiency and ensuring a long product life.

Each cylinder is supplied with a fully compliant G3 installation kit, incorporating an adjustable 5.0 bar pressure regulating valve enabling enhanced pressure and delivery performance to meet even the most demanding of applications.

Key Features:

  • Large heating coils for fast heat up and shorter recovery times
  • 1" BSP hot and cold connections for higher hot water flow rates
  • Operates at up to 5.0 bar water pressure
  • Ultra low heat loss, Eco foam insulation
  • Fully flooded design with external expansion vessel supplied as standard
  • 25 Year cylinder warranty

High Flow Unvented Cylinder


For advice and technical help.

+44 (0) 800 31 969 80