Technical description | 29
6 720 807 794 (2013/04)UNIMAT
Standby loss
The standby loss is part of the rated heat input that is
required to achieve the specified boiler water
temperature. The cause of this loss is the cooling down
of the boiler through radiation and convection during the
standby time (burner idle time).
Boiler
type
Boiler size
Max.
rated
output
Boiler
efficiency
Standard
seasonal
efficiency
[to DIN]
[kw] η
K
1)2)
1) Relative to a system temperature of 80/60 °C. At other system
temperatures, the boiler efficiency changes.
2) Relative to the maximum rated output; for reduced rated
output levels, the boiler efficiency rises accordingly.
η
N
1) 2)
UNIMAT
boiler
UT-L
UT-L 1 650 92.2 94.9
UT-L 2 750 92.4 95.2
UT-L 4 1000 91.8 94.9
UT-L 6 1000 93.3 95.7
UT-L 8 1250 92.4 95.3
UT-L 10 1350 92.9 95.6
UT-L 12 1500 92.6 95.5
UT-L 14 1900 91.4 94.8
UT-L 16 2000 92.3 95.3
UT-L 18 2500 91.7 95.0
UT-L 20 2500 93.1 95.8
UT-L 22 3000 92.7 95.6
UT-L 24 3050 91.3 94.8
UT-L 26 3500 92.7 95.6
UT-L 28 3700 92.3 95.4
UT-L 30 4200 92.0 95.2
UT-L 32 4250 92.0 95.2
UT-L 34 5200 91.9 95.2
UT-L 36 5250 92.6 95.6
UT-L 38 6000 93.0 95.8
UT-L 40 6500 91.3 94.9
UT-L 42 7700 92.0 95.2
UT-L 44 8000 92.8 95.6
UT-L 46 9300 92.2 95.4
UT-L 48 10000 93.1 95.8
UT-L 50 11200 92.2 95.4
UT-L 52 12000 92.6 95.6
UT-L 54 12600 92.7 95.6
UT-L 56 14000 93.5 96.0
UT-L 58 14700 92.2 95.4
UT-L 60 16400 93.4 96.0
UT-L 62 17500 92.9 95.7
UT-L 64 19200 92.8 95.7
Table 17 Boiler efficiency and standard seasonal
efficiency [to DIN] for UNIMAT boilers UT-L
Boiler type Boiler size
Max.
rated
output
Standby loss
q
B
1)
1) Relative to a system temperature of 80/60 °C
[kw] [kW] %
2)
2) Relative to the maximum rated output
UNIMAT
UT-L boiler
UT-L 1 650 2.16 0.333
UT-L 2 750 2.36 0.314
UT-L 4 1000 2.80 0.28
UT-L 6 1000 2.80 0.28
UT-L 8 1250 3.20 0.256
UT-L 10 1350 3.35 0.248
UT-L 12 1500 3.57 0.238
UT-L 14 1900 4.12 0.217
UT-L 16 2000 4.24 0.212
UT-L 18 2500 4.85 0.194
UT-L 20 2500 4.85 0.194
UT-L 22 3000 5.41 0.18
UT-L 24 3050 5.47 0.179
UT-L 26 3500 5.94 0.17
UT-L 28 3700 6.14 0.166
UT-L 30 4200 6.62 0.158
UT-L 32 4250 6.67 0.157
UT-L 34 5200 7.53 0.145
UT-L 36 5250 7.57 0.144
UT-L 38 6000 8.20 0.137
UT-L 40 6500 8.61 0.132
UT-L 42 7700 9.53 0.124
UT-L 44 8000 9.75 0.122
UT-L 46 9300 10.67 0.115
UT-L 48 10000 11.15 0.111
UT-L 50 11200 11.93 0.107
UT-L 52 12000 12.44 0.104
UT-L 54 12600 12.81 0.102
UT-L 56 14000 13.64 0.097
UT-L 58 14700 14.05 0.096
UT-L 60 16400 15.00 0.091
UT-L 62 17500 15.59 0.089
UT-L 64 19200 16.49 0.086
Table 18 Standby loss for UNIMAT UT-L boilers
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