13
BTN 25
BTN 32
BTN 42
BTFS 24
BTFS 32
BTFS 36
Category
-
II2H3+
II2H3+
II2H3+
II2H3+
II2H3+
II2H3+
Type
-
B11BS
C12 - C32 - C42 - C52 - C82
Number of elements of primary heat exchanger
-
4
5
6
3
4
4
Number of nozzles of burner
-
3
4
5
3
3
3
Max heat input
kW
27.87
34.80
47.00
26.6
34.4
39.2
Max heat output
kW
25.05
31.40
42.54
24.0
32.0
36.5
Max output efficiency rate
%
89.9
90.22
90.51
90.20
93.10
93.10
Reduced output efficiency rate (30% of max output)
%
89.0
90.00
89.75
89.23
92.08
92.14
92/42/CEE efficiency rating
-
Casing heat loss
%
0.40
0.50
0.50
2.20
1.90
1.50
Flue gas heat loss with burner on
%
9.7
9.28
8.99
7.6
5
5.4
CH min. flow rate
l/h
540
690
900
520
690
780
Min. CH water pressure
bar
0.8
0.8
0.8
0.8
0.8
0.8
Max CH water pressure
bar
3
3
3
3
3
3
Max CH water temperature
°C
90
90
90
90
90
90
Min. CH water temperature
°C
40
40
40
40
40
40
Capacity of expansion vessel
l
12
12
18
12
12
12
Max CH system capacity
l
240
240
360
240
240
240
Water content
l
16.4
19.8
23
13
16.4
16.4
Water tank capacity
l
60
60
60
60
60
60
DHW supply
Δ
T=30K EN 625
l/10’
220
242
280
215
245
253
prEN 13203 efficiency rating
-
Min. DHW flow rate
l/min
3
3
3
3
3
3
Min. DHW pressure
bar
1
1
1
1
1
1
Max DHW pressure
bar
6
6
6
6
6
6
Max DHW water temperature
°C
65
65
65
65
65
65
Min. DHW water temperature
°C
50
50
50
50
50
50
Capacity of DHW expansion vessel
l
5
5
5
5
5
5
CH Flow/return pipe diameter
inches
G1
G1
G1
G1
G1
G1
DHW inlet/outlet pipe diameter
inches
G3/4
G3/4
G3/4
G3/4
G3/4
G3/4
Gas inlet diameter
inches
G1/2
G1/2
G1/2
G1/2
G1/2
G1/2
Flue gas pipe diameter
mm
130
150
150
--
--
--
Air/flue gas coaxial pipe system diameter
mm
--
--
--
100/60
100/60
100/60
Air/flue gas split pipe system diameter
mm
--
--
--
80+80
80+80
80+80
Voltage/frequency
V/Hz
230/50
230/50
230/50
230/50
230/50
230/50
Power consumption
W
160
200
200
200
250
250
Power fuse
A
4
4
4
4
4
4
Control panel protection rating
IP
X4D
X4D
X4D
X4D
X4D
X4D
Height
mm
1370
1370
1370
1370
1370
1370
Length
mm
600
600
600
600
600
600
Depth
mm
800
800
800
800
800
800
Net boiler weight
Kg
172
189
206
189
223.5
223.5
2.4. Operational data
Burner pressures must be verified after a three minute boiler operation time
