2.1 BOILER TECHNICAL DATA
Table 2-1: Boiler technical data
Units
Outdoor
Combi 21 Combi 26 Combi 36
Water content
(including 32 litre primary store)
litre 48.0 48.5 53.5
gal 10.6 10.7 11.8
Weight (dry) *
kg 147 188 218
lb 325 415 481
Maximum heat output (Kerosene)
kW 21 26 36
Btu/h 71,600 88,700 122,800
Heating system ow and return connections mm 22 22 28
Cold water mains inlet mm 15 15 22
Domestic hot water outlet mm 15 15 22
Minimum ow rate (∆T=10°C) l/h 1,800 2,200 3,000
Minimum ow rate (∆T=20°C) l/h 900 1,100 1,500
Pressure relief valve discharge mm 15
Maximum heating system pressure (cold) bar 1.0
Minimum heating system pressure (cold) bar 0.5
Expansion vessel volume (pre-charged at 1 bar) litres 24
Maximum heating system volume ** litres 255
Minimum domestic hot water ow rate 3.0 litres/min (0.66 gal/min)
Maximum domestic hot water temperature °C 65 (factory set)
Maximum mains water inlet pressure bar 8.0
Minimum recommended mains water inlet
pressure
bar 2.5
Condensate connection 22 mm (only connect plastic pipe)
Flue diameter (conventional) mm 100
Waterside resistance ∆T=10°C mbar 28.5 26.0
Waterside resistance ∆T=20°C mbar 10.0 9.5
Maximum static head m 28
Minimum circulating head m 1
Boiler thermostat range °C 65 to 75
Limit (safety) thermostat shut o temperature °C 110 ± 3
Maximum hearth temperature °C Less than 50
Electricity supply ~230 1ph 50Hz 5A fused
Burner motor power Watts 90
Absorbed motor power kW 0.15
Starting current Amps 4.2 2.6 2.6
Running current Amps 0.85
Oil connection ¼ʺ BSP male (on end of exible fuel hose)
Conventional ue draught
mbar Minimum: 0.087 - Maximum: 0.37
in wg Minimum: 0.035 - Maximum: 0.15
Maximum operating pressure bar 2.0
Maximum operating pressure - pressure relief
valve
bar 2.5
Boiler type ON/OFF
* Weight includes burner (and expansion vessel) but excludes ue
** Based on expansion vessel charge and initial cold system pressure of 0.5 bar
Section 2: Technical DataPage 6
2 TECHNICAL DATA
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