![background image](http://html1.mh-extra.com/html/hamworthy/dorchester-dr-sg-20-210/dorchester-dr-sg-20-210_installation-commissioning-and-servicing-instructions_3490087019.webp)
Dorchester DR-SG XX-210
20 kW
25 kW
30 kW
Nominal power Pn
kW
21
26.3
31.5
Rated heat input Qn
kW
20
25
30
Min heat input Qmin
kW
6
6
6
Gas flow rate at Pn (15 °C)
m
3
/h
0.8
1
1.2
CO
2
value range
%
at Qmin: 10.8 % < CO
2
< 11.2 %
at Qmax: 10.4 % < CO
2
< 10.8 %
Mass flow rate of the flue gas
kg/h
Q
n
Q
min
21.6
7.2
31.7
7.2
38.2
7.2
Temperature of the combustion products
circuit
°C
100
100
100
Nominal operating temperature of the
combustion products
°C
37
53
59
Exhaust outlet interior diameter
mm
80
80
80
Maximum allowable nozzle pressure
(B23P)
Pa
120
200
200
Combustion air flow rate at Qn (15 °C)
m
3
/h
24
30
36
Smoke removal and air inlet type classifications
B23 / B23p / C13/ C33
3.3.2. Combustion G31
13.01.2023
Page 19 / 104
DORCHESTER DR-SG -
Installation, Operation and Maintenance