Product Information
KD Navien
symbol Unit NHC 25B NHC 30B NHC 41B
Condensing boiler
YES YES YES
Low-temperature(**) boiler
NO NO NO
B1 boiler
NO NO NO
Combination heater
YES YES YES
Rated heat output
Prated kW 24.0 27.9 36.8
ηs % 91 90 91
Useful heat output
"At rated heat output
and high-temperature regime(*)"
P4 kW 24.0 27.9 36.8
"At 30% of rated heat output
and low-temperature regime(**)"
P1 kW 7.7 9.3 11.9
"At rated heat output
and high-temperature regime(*)"
η4 % 92.1 91.3 91.7
"At 30% of rated heat output
and low-temperature regime(**)"
η1 % 97.4 96.0 96.6
Auxiliary electricity consumption
At full load
elmax kW 0.136 0.145 0.163
At part load
elmin kW 0.057 0.060 0.066
In standby mode
Psb kW 0.013 0.014 0.012
Other items
Standby heat loss
Pstby kW 0.111 0.111 0.140
Ignition burner power consumption
Pign kW 0 0 0
Annual energy consumption
QHE kWh 76 89 116
Sound power level, indoors
LWA dB 68 66 69
For combination heaters
XL XL XXL
Daily electricity consumption
Qelec kWh 0.443 0.440 0.468
Annual electricity consumption
AEC kWh 94 93 105
ηwh % 64 62 67
Daily fuel consumption
Qfuel kWh 28.617 29.532 35.339
Annual fuel consumption
AFC GJ 22 23 30
Contact details
Saturn Heating Ltd, Shercock Road, Carrickmacross
Co. Monaghan, Ireland
(*) High-temperature regime means 60
˚C
return temperature at heater inlet and 80
˚C
feed temperature at heater outlet.
(**) Low-temperature means for condensing boilers 30
˚C
, for low-temperature boilers 37
˚C
and for other heaters 50
˚C
return
temperature (at heater inlet).
Seasonal space heating energy eciency
Declared load prole
Water heating energy eciency
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