Glow-worm provides a wide range of mains-fed unvented hot water cylinders that are designed to work with any UK boiler, not just the Glow-worm range, in open vent and sealed systems.

Each manufactured from high grade stainless steel, with laser welded seams and guaranteed against perforation of the steel shell for 25 years. All Glow-worm cylinders have excellent insulation that achieves heat loss as low as 1.7kWh and a high recover heating coil that reheats the cylinder in as little as 20 minutes.

Key Features
•High grade stainless steel cylinder with laser welded seams
•Insulation meets CheSS best practice as low as 1.7 kWh
•High recovery heating coil - just 20 minutes
•External expansion vessel (supplied)
•Expansion vessel wall mounting bracket
•Simple front connection compression fittings
•Back-up immersion heater on all models
•Covered controls and wiring box
•Simple maintenance - no anode required
•High flow rates achievable working at 3.5bar pressure