01202 662500
Dorchester DR-SG stainless steel condensing water heater
- Available in 10 power outputs over 3 storage capacities
- Features a full stainless steel tank, heat exchanger and coil offering a durable solution while maximising product life
Product information
Storage tank, heat exchanger and coil all manufactured from stainless steel
Enhanced durability under challenging water conditions
ErP Class A
NOx under 40 mg/kWh across the range (Class 6)
Fully Part L Compliant
5 year warranty, as standard
Quick and easy burner access
Operated via the popular Siemens LMS Mini controls platform
Integrated flue non-return valve
Can deliver flow rates to satisfy high demand environments
Suitable for natural gas and LPG systems (conversion kit available)
Designed to fit through a standard 800mm doorway with a narrow diameter of <80cm (excluding 538 model)
Combustion chamber can be cleaned using water jets. Design of the bypass greatly minimises any risk of clogging
Supplied with universal flue starter kits suitable for both open and room sealed flue systems
Optional accessories available for efficient system management, as well as enabling connection to wider BMS systems
Ideal uses/applications
New build projects.
Large commercial and public buildings including schools, hospitals and hotels.
Locations with substantial and continuous hot water demands including hospitals, hotels and sports facilities.
To see where Dorchester condensing water heaters have been used, visit the case study section of our website.
- Energy
Units
DR-SG 20-210
DR-SG 25-210
DR-SG 30-210
DR-SG 35-356
DR-SG 50-356
DR-SG 60-356
DR-SG 70-538
DR-SG 80-538
DR-SG 100-538
DR-SG 120-538
Max Heat Input (Gross)
kW
20
25
30
35
50
56.6
69.9
80
100
120
Max Power Output (Net)
kW
21
26.3
31.5
37
53
60
74.1
84.8
106
127.2
Building regulations Part L, EN89 100% efficiency (NCV)
%
105
105
105
105
106
106
106
106
106
106
Building regulations Part L, EN89 100% efficiency (GCV)
%
94.6
94.6
94.6
95.5
95.5
95.5
95.5
95.5
95.5
95.5
Standby Loss
kWh/day
1.6
1.6
1.6
1.9
1.9
1.9
3.2
3.2
3.2
3.2
Building regulations Part L, Maintenance Consumption (EN89)
kWh/day
2.7
2.7
2.7
3.4
3.4
3.4
5.6
5.6
5.6
5.6
ErP efficiency rating
A
A
A
A
A
A
A
n/a
n/a
n/a
Water Heater Efficiency (ErP)
%
95.9
91.7
93.5
90.3
92.5
91.4
92.7
91.3
90.8
90
ErP Load Profile
XXL
XXL
XXL
XXL
XXL
XXL
3XL
3XL
3XL
3XL
- Water
Units
DR-SG 20-210
DR-SG 25-210
DR-SG 30-210
DR-SG 35-356
DR-SG 50-356
DR-SG 60-356
DR-SG 70-538
DR-SG 80-538
DR-SG 100-538
DR-SG 120-538
Storage Capacity
L
210
210
210
356
356
356
538
538
538
538
Continuous Flow at ΔT 30°C
l/hr
600
750
900
1060
1520
1820
2130
2430
3040
3650
1st 10 mins at ΔT 50°C
l/10'
175
205
220
330
400
435
475
500
550
600
1st hour at ΔT 50°C
l/60'
450
570
580
630
1100
1210
1500
1700
2000
2300
Continuous Flow at ΔT 50°C
l/hr
360
450
540
640
910
1090
1280
1460
1820
2190
Max DHW temperature setpoint
°C
80
80
80
80
80
80
80
80
80
80
Max operating pressure (open vented)
bar
7
7
7
7
7
7
7
7
7
7
Max operating pressure (unvented)
bar
6.5
6.5
6.5
6.5
6.5
6.5
6.5
6.5
6.5
6.5
Heat-up time (mins) 50°C rise
36
29
24
35
24
20
26
23
18
15
Heat-up time (mins) 55°C rise
40
32
26
39
27
22
29
25
20
17
Cold Inlet connection
Rp 1 1/2"
Rp 1 1/2"
Rp 1 1/2"
Rp 1 1/2"
Rp 1 1/2"
Rp 1 1/2"
Rp 1 1/2"
Rp 1 1/2"
Rp 1 1/2"
Rp 1 1/2"
Hot outlet connection
Rp 1 1/2"
Rp 1 1/2"
Rp 1 1/2"
Rp 1 1/2"
Rp 1 1/2"
Rp 1 1/2"
Rp 1 1/2"
Rp 1 1/2"
Rp 1 1/2"
Rp 1 1/2"
Secondary return connection
Rp 1 1/2"
Rp 1 1/2"
Rp 1 1/2"
Rp 1 1/2"
Rp 1 1/2"
Rp 1 1/2"
Rp 1 1/2"
Rp 1 1/2"
Rp 1 1/2"
Rp 1 1/2"
- Gas
Units
DR-SG 20-210
DR-SG 25-210
DR-SG 30-210
DR-SG 35-356
DR-SG 50-356
DR-SG 60-356
DR-SG 70-538
DR-SG 80-538
DR-SG 100-538
DR-SG 120-538
Gas Inlet Pressure (Nominal, G20)
mbar
20
20
20
20
20
20
20
20
20
20
Gas flow rate (G20)
m³/hr
2.1
2.6
3.2
3.7
5.3
6
7.4
8.5
11
12.7
Gas Inlet Pressure (Nominal, G30)
mbar
37
37
37
37
37
37
37
37
37
37
Gas flow rate (G31)
m³/hr
0.8
1
1.2
1.4
2
2.4
2.7
3.1
4
4.7
Gas connection
R 3/4"
R 3/4"
R 3/4"
R 3/4"
R 3/4"
R 3/4"
R 1"
R 1"
R 1"
R 1"
- Flues
Units
DR-SG 20-210
DR-SG 25-210
DR-SG 30-210
DR-SG 35-356
DR-SG 50-356
DR-SG 60-356
DR-SG 70-538
DR-SG 80-538
DR-SG 100-538
DR-SG 120-538
Max flue gas temperature
°C
100
100
100
100
100
100
100
100
100
100
Nominal flue gas operating temp
°C
39
55
60
40.3
50.9
51.6
56.8
58.8
59.8
59.3
Flue Gas Volume @15°C
kg/h
33.1
41.4
49.7
53.3
79.9
95
104.4
118.8
158.4
187.2
NOx emissions
mg/kWh
29
29
29
32
32
32
39.5
39.5
39.5
39.5
Pressure at flue outlet
Pa
110
170
200
130
200
200
65
95
155
200
Air inlet/Flue outlet diameter
mm
80
80
80
100
100
100
130
130
130
130
Max system length - C type flues
m
20
20
20
20
20
20
20
20
20
20
- Electrical
Units
DR-SG 20-210
DR-SG 25-210
DR-SG 30-210
DR-SG 35-356
DR-SG 50-356
DR-SG 60-356
DR-SG 70-538
DR-SG 80-538
DR-SG 100-538
DR-SG 120-538
Fuse rating
amp
6.3
6.3
6.3
6.3
6.3
6.3
6.3
6.3
6.3
6.3
Power consumption (maximum)
W
12.7
12.7
12.7
18
18
18
22.5
22.5
22.5
22.5
Power consumption (standby)
W
3.6
3.6
3.6
3.7
3.7
3.7
4.5
4.5
4.5
4.5
Electrical Supply
V
230 V AC (+10%, -15%) 50Hz
Sounds Power Level (Noise emissions)
dBA
64
64
64
75
75
75
67
69
74
78
- Misc
Units
DR-SG 20-210
DR-SG 25-210
DR-SG 30-210
DR-SG 35-356
DR-SG 50-356
DR-SG 60-356
DR-SG 70-538
DR-SG 80-538
DR-SG 100-538
DR-SG 120-538
Number of Anodes
1
1
1
2
2
2
3
3
3
3
Dry weight
kg
96
96
96
142
142
142
240
240
240
240
Filled Weight
kg
306
306
306
498
498
498
778
778
778
778
Height
mm
1802
1802
1802
1874
1874
1874
2028
2028
2028
2028
Diameter (inc insulation)
mm
600
600
600
750
750
750
890
890
890
890
Hamworthy Range Guide 0708