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Glow Worm unvented hot water cylinders

Unvented Cylinders


Glow Worm Unvented Cylinders

The new range of mains-fed domestic hot water cylinders from Glow-worm are designed for use with UK boilers in hot water systems.
Available in six sizes; 115, 150, 175, 200, 250 and 300 litres, they are suitable for all sizes of property from a small single bathroom property up to a large two bathroom property with en suite shower room. Manufactured from high grade stainless steel with all seams laser welded they are built to last and carry a 25 year guarantee against perforation of the steel shell. The cylinders operate directly from a mains water pressure supply and do not require a feed from a cold-water storage tank. The 22mm DHW outlet and cold water mains inlet connections ensure optimum flow rates.

Performance is further enhanced by insulation that achieves heat loss as little as 1.7kW per 24 hours and a high-recovery heating coil that provides recovery in as little as 20 minutes. All cylinders are also provided with an auxiliary back up 3kW electric immersion heater, including operating thermostat and energy cut out. As with all Glow-worm products installation is simple with all the connections at the front of the cylinder.

Main Features
  • Stylish mains-fed unvented domestic hot water cylinders
  • Volumes of 115L / 150L / 175L / 200L / 250L / 300L
  • High grade stainless steel cylinder
  • Laser welded seams
  • Insulation meets CHeSS best practice (as low as 1.7kW/24hr)
  • High recovery heating coil (as low as 20 minutes)
  • Stand-alone cylinder (complies with G3)
  • High flow rates achievable working at 3.5bar pressure
  • External expansion vessel (supplied)
  • Expansion vessel wall mounting bracket (available as an accessory)
  • Dimensions of 600mm at widest point (all models)
  • Simple front connection compression fittings
  • Back-up immersion heater on all models
  • Covered controls and wiring box
  • Simple maintenance (no anode required)
  • 25 year warranty for perforation of shell


Related Literature:
Product Manual.pdf (830.3kb)
Cylinder Info.pdf (209kb)
Product info.pdf (1543kb)


115 Litres 750.38 inc VAT
150 Litres 777.12 inc VAT
175 Litres 822.94 inc VAT
200 Litres 854.45 inc VAT
250 Litres 914.59 inc VAT
300 Litres 999.56 inc VAT



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