0020308118_05 Installation and maintenance instructions 11
VUW 30/40
Weight (without packaging, without water)
41 kg
Weight ready for operation (filled)
48 kg
Technical data – G20 output/heat input (depending on the unit version)
VU 10 VU 15 VU 20
Gas connection pressure, G20 natural gas
2.0 kPa
(20.0 mbar)
2.0 kPa
(20.0 mbar)
2.0 kPa
(20.0 mbar)
NOx emission, weighted, G20 (EN 15502-2-1)
35.70 mg/kW⋅h 35.00 mg/kW⋅h 33.20 mg/kW⋅h
30% efficiency, G20
108.2 % 108.5 % 108.8 %
Gas flow rate for max. gas volume at 15 °C and 1013 mbar,
G20
2.16 m³/h 2.16 m³/h 2.59 m³/h
Nominal heat output range at 40/30 °C
2.9 to 10.9 kW 2.9 to 16.4 kW 2.9 to 21.7 kW
Nominal heat output range at 50/30 °C
2.8 to 10.6 kW 2.8 to 15.9 kW 2.8 to 21.2 kW
Nominal heat output range at 60/40 °C
2.6 to 10.1 kW 2.6 to 15.1 kW 2.6 to 20.3 kW
Nominal heat output range at 80/60 °C
2.5 to 9.9 kW 2.5 to 14.8 kW 2.5 to 19.8 kW
Max. heat input for heating
10.2 kW 15.3 kW 20.4 kW
Heating min. heat input
2.7 kW 2.7 kW 2.7 kW
Min. flue gas mass flow rate
1.23 g/s
(4.43 kg/h)
1.23 g/s
(4.43 kg/h)
1.23 g/s
(4.43 kg/h)
Max. flue gas mass flow rate
10.28 g/s
(37.01 kg/h)
10.28 g/s
(37.01 kg/h)
12.34 g/s
(44.42 kg/h)
Max. DHW heat output
19.6 kW 19.6 kW 23.6 kW
DHW nominal heat input
20.4 kW 20.4 kW 24.5 kW
Nominal heat input range for heating
2.7 to 10.2 kW 2.7 to 15.3 kW 2.7 to 20.4 kW
Heating adjustment range
10.2 kW (auto) 2.7 to 15.3 kW 2.7 to 20.4 kW
VU 25 VU 30 VU 35
Gas connection pressure, G20 natural gas
2.0 kPa
(20.0 mbar)
2.0 kPa
(20.0 mbar)
2.0 kPa
(20.0 mbar)
NOx emission, weighted, G20 (EN 15502-2-1)
27.00 mg/kW⋅h 27.80 mg/kW⋅h 27.30 mg/kW⋅h
30% efficiency, G20
109.4 % 109.1 % 109.4 %
Gas flow rate for max. gas volume at 15 °C and 1013 mbar,
G20
3.24 m³/h 3.76 m³/h 4.32 m³/h
Nominal heat output range at 40/30 °C
4.0 to 26.9 kW 4.3 to 32.9 kW 5.2 to 37.8 kW
Nominal heat output range at 50/30 °C
3.9 to 26.5 kW 4.2 to 32.2 kW 5.0 to 37.7 kW
Nominal heat output range at 60/40 °C
3.6 to 25.6 kW 4.0 to 31.1 kW 4.8 to 36.4 kW
Nominal heat output range at 80/60 °C
3.5 to 24.9 kW 3.7 to 29.9 kW 4.5 to 34.9 kW
Max. heat input for heating
25.5 kW 30.6 kW 35.7 kW
Heating min. heat input
3.7 kW 4.2 kW 4.8 kW
Min. flue gas mass flow rate
1.71 g/s
(6.16 kg/h)
1.94 g/s
(6.98 kg/h)
2.22 g/s
(7.99 kg/h)
Max. flue gas mass flow rate
14.68 g/s
(52.85 kg/h)
17.52 g/s
(63.07 kg/h)
20.55 g/s
(73.98 kg/h)
Max. DHW heat output
29.6 kW 34.3 kW 39.4 kW
DHW nominal heat input
30.6 kW 35.5 kW 40.8 kW
Nominal heat input range for heating
3.7 to 25.5 kW 4.2 to 30.6 kW 4.8 to 35.7 kW
Heating adjustment range
3.7 to 25.5 kW 4.2 to 30.6 kW 4.8 to 35.7 kW
VUW 20/26 VUW 25/32 VUW 30/36
Gas connection pressure, G20 natural gas
2.0 kPa
(20.0 mbar)
2.0 kPa
(20.0 mbar)
2.0 kPa
(20.0 mbar)
NOx emission, weighted, G20 (EN 15502-2-1)
33.20 mg/kW⋅h 27.00 mg/kW⋅h 27.80 mg/kW⋅h
30% efficiency, G20
108.8 % 109.4 % 109.1 %
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