Twin Coil Cylinders - for renewable heating systems

Glow-worm’s twin coil cylinder has one coil which heats water using power from the boiler and the second coil which heats water using energy from a solar panel. Whether you are installing a solar system now or simply preparing for the future, Glow-worm twin coil cylinders are fully compatible with any open vent or sealed system boiler and fit easily through any standard airing cupboard door.

Special construction of the coils inside the cylinder ensures that the top 2/3 of the cylinder is heated first enabling high volumes of hot water to be delivered on demand and the thermostatic mixing valve mix cold water into the solar heated water to achieve the required temperature for safewater usage.

Key Features

• Twin coil available in 200, 250 & 300 litres
• High grade stainless steel cylinder with laser welded seams
• Insulation meeting CheSS best practice as low as 1.7kWh/24hrs1
• High recovery heating coil –just 20 minutes
• External expansion vessel supplied
• Covered controls and wiring box
• Simple maintenance – no anode required
• High flow rates achievable working at 3.5bar pressure
• 25 year warranty on cylinder shell

Technical Table

Cylinder Size	200	250	300
Dimensions & Weights
Diameter (mm)	550	550	550
Height 1	1499	1789	2109
Length of the immersion heater (mm)	430	430	430
Weight empty/ full (kg)	39 / 245	44 / 310	49 / 340
Performance
Capacity (l)	200	250	300
Reheat capacity (boiler) (%)	63	63	60
Heat up time (boiler) (mins)	21	26	30
Recovery time (boiler) (mins)	13	16	21
Heat loss (kWh/24hrs)	1.9	2.1	2.4
Safety
Max mains inlet pressure (bar)	10	10	10
Pressure reducing valve setting (bar)	3.5	3.5	3.5
Expension relief valve setting (bar)	6.0	6.0	6.0
T&P relief valve settings (oC/bar	95 / 7.0	96 / 7.0	97 / 7.0
Connections
Mains inlet / hot water outlet 2 (mm)	22	22	22
Balanced cold water outlet 2 (mm)	22	22	22
Boiler flow / return 2 (mm)	22	22	22
Solar flow / return 2 (mm)	22	22	22
Thermostats & thermal cut outs [V (Hz)]	240V (50Hz)	240V (50Hz)	240V (50Hz)
Immersion heater & motorised valve [V (Hz)]	240V (50Hz)	240V (50Hz)	240V (50Hz)
1 Excluding clearances for connecting fittings / pipework
2 Compression fittings supplied