© MHG Heating Ltd
5
MHG Heating Ltd Unit 4 Epsom Downs Metro Centre, Waterfield, Tadworth, Surrey KT20 5LR
Telephone 01737 358000 Fax 08456 448803 Email
Web www.mhgheating.co.uk
010517
3.0 Technical Data
Model
115
125B
160B
Min.
Max.
Min.
Max.
Min.
Max.
Type of Flue Installation
B23,C13,C33,C53,
C43,C63,C83
B23,C43,C53,C63,C83
Gas Category
Fuel Type
G20,G31
Gas Pressure (Min/Max) Natural Gas
mbar
17/25
Nominal Heat Input
kW
27
108.5
17
121
21.5
152
Nominal Heat Output at (80-60°C)
kW
26.1
105.4
16.4
116.2
20.9
146
Nominal Heat Output at (50-30°C)
kW
29.3
116.1
18.4
126
23.4
158.8
Water Operating Pressure
Bar
0.8
6
0.8
6
0.8
6
Maximum Operation Temperature
°C
90
90
90
Water Content
L
11.7
11.7
14.9
Condensing Water Mass
kg/h
16
17.5
22.4
Efficiency & Emissions
Heat Efficiency Qmin(80-60°C)
%
96.8
96.4
97.2
Heat Efficiency Qmax (80-60°C)
%
97.1
96
96.1
Heat Efficiency Qmin(50-30°C)
%
108.4
108.2
109.0
Heat Efficiency Qmax (50-30°C)
%
107.0
104.1
104.5
Partial Load, Return 30°C (Direct Method)
%
107.6
109.2
109.1
Flue gas Temperature (50-30°C)
°C
33
64
31.5
64.8
32.4
62.6
Flue gas Temperature (80-60°C)
°C
59
77
56.3
88
59.4
82.5
Gas Diaphragm (G20-G25)
mm
10.7
-
-
Gas Diaphragm (G31)
mm
7
9.5
9.5
CO
2
Emissions (G20)
%
8.8
9.3
8.7
9.4
9.2
9.4
CO
2
Emissions (G25)
%
8.7
9.2
8.8
9.6
-
-
CO
2
Emissions (G30)
%
10.3
10.9
11.1
11.02
10.3
10.7
NO
X
Emissions (G20)
mg/kW
h
17.1
51.72
98.76
NO
X
Emissions (G25)
mg/kW
h
26.43
54.83
102.64
NO
X
Emissions (G30)
mg/kW
h
38.61
98.97
-
NO
X
Class
5
5
4
Flue Gas Mass (G20)
g/sec
12.60
48.40
8.03
53.53
9.69
67.24
Flue Gas Mass (G25)
g/sec
12.70
48.90
7.96
52.61
-
-
Flue Gas Mass (G30)
g/sec
12.20
46.30
7.13
50.14
9.64
65.90
Gas Consumption (G20)
m
3
/h
2.90
11.50
1.77
12.52
2.26
15.61
Gas Consumption (G25)
m
3
/h
3.30
13.40
2.10
14.61
-
-
Gas Consumption (G30)
m
3
/h
0.80
3.40
0.67
4.91
0.89
6.14
Fan Speed (G20)
rpm
1650
5850
1300
6400
1400
7250
Fan Speed (G25)
rpm
1650
5850
1300
6400
-
-
Fan Speed (G30)
rpm
1500
5350
1150
6150
1400
7250
Boiler Connections
Boiler flow Connection
“
1 ¼”
1 ¼”
1 ¼”
Boiler Return connection
“
1 ¼”
1 ¼”
1 ¼”
Gas Supply
“
1”
1”
1”
Safety Relief Valve Discharge
“
½”
½”
½”
Condensate Syphon Discharge
Ø
25
25
25
Flue Gas Outlet
Ø
100
100
100
Air Inlet
Ø
100
100
100
Electrical Connections
Power supply
V/Hz
230-50
230-50
230-50
Electrical Power
W
300
300
400
IP Class
IP
X4D
X4D
X4D
Boiler dimensions & weight
Dimensions WxLxH
mm
557x580x865
557x580x865
557x690x865
Weight
kg
92
92
98
