8
GENERAL INFORMATION
GENERAL INFORMATION
Technical specifications
DESCRIPTION
BOILER TAU NB M/E
115 NB
3M-E
150 NB
3M-E
210 NB
25M-E
270 NB
25M-E
350 NB
25M-E
Device type
Condensing boiler for central heating
B23
Fuel
All gas fuels
Device category
See Burner
Rated heat input (Qmax) HCV (LCV)
127,6
(115)
166,5
(150)
233,1
(210)
299,7
(270)
388,5
(350)
kW
Rated heat input (Qmin) HCV (LCV)
88,8
(80)
123,2
(111)
167,6
(151)
234,2
(211)
300,8
(271)
kW
Useful (rated) heat output
112
147
205
264
344
Rated maximum useful heat output (80/60°C) P4
112,4
146,6
205,2
264,3
343,7
kW
Rated min. useful heat output (80/60°C) (Pn min)
78,4
108,2
147,5
207,2
266,4
kW
30% heat output with return at 30°C (P1)
33,7
44,0
61,6
79,3
103,1
kW
Seasonal energy efficiency
η
s
92
92
93
93
93
%
Efficiency at rated heat input in high temperature
mode
η
4 (80-60°C) HCV (LCV)
88,0
(97,7)
88,0
(97,7)
88,0
(97,7)
88,2
(97,9)
88,5
(98,2)
%
Useful efficiency at Pn min (80/60°C) HCV (LCV)
88,3
(98)
87,8
(97,5)
88,0
(97,7)
88,5
(98,2)
88,6
(98,3)
%
Efficiency at 30% rated heat input in low tempera-
ture mode
η
1 with return at 30°C (HCV)
97,6
(108,3)
97,7
(108,5)
98,5
(109,3)
98,4
(109,2)
97,9
(108,7)
%
Losses from stack for sensible heat (Qmax)
1,7
1,7
1,7
1,5
1,5
%
Losses from casing with burner on
0,3
0,3
0,3
0,5
1,0
%
Constant pressure drop
300
300
420
540
700
W
Flue gas temperature (
∆
T)
< 45÷75 (*)
°C
Emissions at max. heat input Nox (0% O2)
< 80
mg/kWh
Flue gas mass flow rate (Qmax)
0,05
0,07
0,09
0,12
0,15
kg/sec
Furnace pressure
2,2
2,0
2,7
3,2
4,6
mbar
Furnace volume
172
172
172
241
279
dm
3
Tot. volume of flue gas side
246
272
292
413
482
dm
3
Heat exchange surface area
7,0
8,2
10,4
13,0
16,3
m
2
Volumetric heat load (Qmax)
669
872
1221
1120
1254
dm
3
Specific heat load
16,2
18
19,9
20,4
20,9
dm
2
Maximum condensate production
11,0
18,4
27,4
31,9
40,9
l/h
Maximum working pressure
6
bar
Maximum permitted temperature
110
°C
Maximum operating temperature
95
°C
Pressure drop
∆
T 10°C
50
43,2
36,0
54,0
46,4
mbar
Pressure drop
∆
T 20°C
12,5
11,3
10,2
16,3
13,4
mbar
Water capacity
375
360
323
495
555
l
Consumption at full load (Elmax)
440
650
650
800
800
W
Consumption at part load (Elmin)
132
195
195
240
240
W
Electrical consumption in standby mode (PSB)
20
20
20
20
20
W
(*)
Depends on return temperature (30-60°C).
9
The stack must guarantee the minimum draught specified by applicable technical standards, assuming zero pressure at the
connection to the flue.
9
Values obtained with reference burners (R) used for the performance verification tests (see burner pairing table), calibrated with
CO2 = 9,7% and
λ
= 1,2.
