General
1
We reserve the right to make technical modifications
Buderus Ltd. • http://www.buderus-domestic.co.uk
6
Servicing manual Gas condensing boiler Buderus 500-24/S, 500-24/C and 500-28/C • Issued 02/2006
box 5
Technical specifications
Buderus
Unit
500-24/S
500-24/C
500-28/C
Hot water capacity (combination boilers)
kW
5.7 – 28.5
(with external
tank)
6.0 – 24.0
5.7 – 28.5
Rated thermal load for CH
kW
5.7 – 23.0
5.7 – 23.0
5.7 – 23.0
Rated thermal load for preparing DHW
kW
5.7 – 28.5
5.7 – 23.0
5.7 – 28.5
Rated heating capacity for system temperature
(modulating from 30° to 100°)
Heating curve 75/60 °C
Heating curve 40/30 °C
kW
kW
5.3 – 22.0
6.0 – 24.0
5.3 – 22.0
6.0 – 24.0
5.3 – 22.0
6.0 – 24.0
Seasonal efficiency (SEDBUK) for natural gas
for propane
%
%
90.3
92.3
90.3
92.3
90.3
92.3
Maximum gas consumption, hot water/tank
m
3
/h
3.02
2.43
3.02
Maximum gas consumption, heating
m
3
/h
2.43
2.43
2.43
Boiler efficiency (40/30°C) (lower value/upper value) (full load)
%
104 / 104
104 / 104
104 / 104
Boiler efficiency (40/30°C) (lower value) (partial load)
%
107
107
107
Boiler efficiency (40/30°C) (upper value) (partial load)
%
96.3
96.3
96.3
Boiler efficiency (75/60 °C) (lower value/upper value) (full load)
%
95.7 / 86.2
95.7 / 86.2
95.7 / 86.2
Boiler efficiency (75/60°C) (lower value/upper value) (partial load)
%
94.6 / 85.2
94.6 / 85.2
94.6 / 85.2
Chimney loss with burner shut down (standby heat loss) at nominal
thermal load
%
1.2
1.2
1.2
Hot water circuit
Δ
T at residual head of 200 mbar
°C
<20
<20
<20
Maximum flow temperature
°C
80
80
80
Permitted system pressure
bar
1.0 – 3.0
1.0 – 3.0
1.0 – 3.0
Expansion vessel
Capacity of expansion vessel
l
7.5
7.5
7.5
Admission pressure of expansion vessel
bar
1.0
1.0
1.0
Plate heat exchanger
DHW flow rate at 35 °C rise
l/min
–
9.4
11.7
Supply pressure of hot water
bar
–
0.8 - 10.0
0.9 - 10.0
Adjustable DHW temperature
°C
–
40 - 60
40 - 60
Pipe connections
Condensate outlet
Ø mm
21.5
21.5
21.5
CH flow/return (compression fitting)
Ø mm
22.0
22.0
22.0
MCW inlet / DHW outlet (compression fitting)
Ø mm
15.0
15.0
15.0
Gas on installation frame (compression fitting)
Ø mm
22.0
22.0
22.0
Pressure relief valve
Ø mm
15 mm (adapter supplied with boiler)
Flue-gas connection
Type of flue-gas connection (model)
C
13(x)
, C
33(x)
, C
53(x)
, C
73(x)
Ø Flue gas pipe / combustion-air inlet
mm
60/100 (accessory)
