Grant Vortex VTXBH1521, Installation And Servicing Instructions

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2.1 BOiLER tECHNiCaL Data
table 2-1: Boiler technical data
Units 15/21 21/26 26/35 36/46 46/58 58/70
Water content
litre 13 13 19 21 50 50
gal 2.9 2.9 4.2 4.7 11 11
Weight (dry)*
kg 125 125 143 145 257 301
lb 276 276 315 320 567 664
Maximum heat output (Kerosene)
kW 21.5 26.3 35.4 46.0 58.0 70.0
Btu/h 73,400 89,800 120,000 157,000 197,900 238,840
Minimum flow rate (∆T=10°C) l/h 1,780 2,200 2,980 4,000 5,200 6,000
Minimum flow rate (∆T=20°C) l/h 890 1,100 1,490 2,000 2,600 3,000
Condensate connection 22 mm (only connection plastic pipe)
Flue diameter (conventional) 100 mm 100 mm 100 mm 100 mm 125 mm** 125 mm**
Waterside resistance ∆T=10°C mbar 28.5 26.0
Waterside resistance ∆T=20°C mbar 10 9.5
Maximum static head m 28
Minimum circulating head m 1
Boiler thermostat range °C 50±5 to 75±4
Limit (safety) thermostat shut off temperature °C 110 ± 3
Maximum hearth temperature °C Less than 50
Electricity supply ~230 1ph 50Hz 5A fused
Burner motor power Watts 90 150
Absorbed motor power kW 0.16
Starting current Amps 4.2 6.4
Running current Amps 0.85 1.2
Oil connection ¼ʺ BSP male (on end of flexible fuel hose)
Conventional flue draught
mbar Minimum: 0.087 - Maximum: 0.37
in wg Minimum: 0.035 - Maximum: 0.15
Maximum operating pressure - sealed/open system bar 2.5
Maximum operating pressure - pressure relief valve bar 2.5
Boiler type ON/OFF
* Weight includes burner but excludes flue
** 125 mm diameter required for flexible flue liner (orange system). For rigid flue systems, e.g. green system, 100 mm diameter flue required. Refer to Section 9
for further details.
Section 2: technical Data page 6
2 tECHNiCaL Data