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
- 10 output models in the range 20-210, 25-210, 30-210, 35-356, 50-356, 60-356, 70-538, 80-538, 80-538, 100-538, 120-538
- 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
- Optional accessories available for efficient system management, as well as enabling connection to wider BMS systems
Technical data
| Units | DR-SG 20-210 | |
|---|---|---|
| Energy | ||
| Max Heat Input (Gross) | kW | 20 |
| Max Power Output (Net) | kW | 21 |
| Building regulations Part L, EN89 100% efficiency (NCV) | % | 105 |
| Building regulations Part L, EN89 100% efficiency (GCV) | % | 94.6 |
| Standby Loss | kWh/day | 1.6 |
| Building regulations Part L, Maintenance Consumption (EN89) | kWh/day | 2.7 |
| ErP efficiency rating | A | |
| Water Heater Efficiency (ErP) | % | 95.9 |
| ErP Load Profile | XXL | |
| Water | ||
| Storage Capacity | L | 210 |
| Continuous Flow at ΔT 30°C | l/hr | 600 |
| 1st 10 mins at ΔT 50°C | l/10' | 175 |
| 1st hour at ΔT 50°C | l/60' | 450 |
| Continuous Flow at ΔT 50°C | l/hr | 360 |
| Max DHW temperature setpoint | °C | 80 |
| Max operating pressure (open vented) | bar | 7 |
| Max operating pressure (unvented) | bar | 6.5 |
| Heat-up time (mins) 50°C rise | 36 | |
| Heat-up time (mins) 55°C rise | 40 | |
| Cold Inlet connection | Rp 1 1/2" | |
| Hot outlet connection | Rp 1 1/2" | |
| Secondary return connection | Rp 1 1/2" | |
| Gas | ||
| Gas Inlet Pressure (Nominal, G20) | mbar | 20 |
| Gas flow rate (G20) | m³/hr | 2.1 |
| Gas Inlet Pressure (Nominal, G30) | mbar | 37 |
| Gas flow rate (G31) | m³/hr | 0.8 |
| Gas connection | R 3/4" | |
| Flues | ||
| Max flue gas temperature | °C | 100 |
| Nominal flue gas operating temp | °C | 39 |
| Flue Gas Volume @15°C | kg/h | 33.1 |
| NOx emissions | mg/kWh | 29 |
| Pressure at flue outlet | Pa | 110 |
| Air inlet/Flue outlet diameter | mm | 80 |
| Max system length - C type flues | m | 20 |
| Electrical | ||
| Fuse rating | amp | 6.3 |
| Power consumption (maximum) | W | 12.7 |
| Power consumption (standby) | W | 3.6 |
| Electrical Supply | V | 230 V AC (+10%, -15%) 50Hz |
| Sounds Power Level (Noise emissions) | dBA | 64 |
| Misc | ||
| Number of Anodes | 1 | |
| Dry weight | kg | 96 |
| Filled Weight | kg | 306 |
| Height | mm | 1802 |
| Diameter (inc insulation) | mm | 600 |
Downloads
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Dorchester DR-SG BrochureProduct brochures 1031 kb |
Download |
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DRSG flue starter kit installation manualInstallers guides 1659 kb |
Download |
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Dorchester DR-SG Installation ManualInstallers guides 11578 kb |
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NAVISTEM H3100 INSTALLATION MANUALInstallers guides 5521 kb |
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Dorchester DR-SG - 20-30kW CADCAD 1463 kb |
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Dorchester DR-SG - 35-50-60kW CADCAD 1474 kb |
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Dorchester DR-SG - 70-80-100-120kW CADCAD 1459 kb |
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Dorchester DR-SG LPG - 70-80-100-120Kw CADCAD 1477 kb |
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Dorchester DR-SG Technical Submittal Sheets DR-SG 20-210 25-210 30-21099 kb |
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Dorchester DR-SG Technical Submittal Sheets DR-SG 35-356 50-356 60-356103 kb |
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Dorchester DR-SG Technical Submittal Sheets DR-SG 70-538 80-538 100-538 120-538111 kb |
Download |
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.