Stratton mk2 wall hung boiler
Wall hung condensing commercial boiler with a stainless steel heat exchanger.
Available in 7 models with outputs (at 50/30°C) of 43, 61, 76, 87, 104, 129 and 146kW.
Product information
- A wide range of outputs enables you to specify the best wall hung boiler model for your commercial heating system.
- Accurate load matching with a high turndown ratio and fully modulating performance.
- Heat exchanger manufactured in corrosion resistant stainless steel for a long life, backed up by a 5-year heat exchanger warranty.
- Built in boiler sequence controls capable of controlling up to 16 boiler modules and hot water circuits.
- Low height - less than 2.2 metres to top of flue header when mounted on Hamworthy low height pipe kit.
- Space saving flue arrangement above the boiler thanks to a concentric flue connector and integral flue gas non-return valve.
- Models up to 129kW meet the strict energy saving criteria for the Government’s Energy Technology List (ETL), providing significant financial advantages for purchasers through the Enhanced Capital Allowances (ECA) scheme.
- Quick and easy to install with optional pipe kits for up to 4 boilers and wall mounting plate for individual boilers.
- Simple to move and store due to lightweight heat exchanger, and flat base of unit reduces risk of damaging connections.
- Suitable for use with room sealed or open flue systems giving you greater flexibility in siting the boilers.
- Simple to maintain using quick release internal water and gas couplings.
- A commercial boiler designed for sealed systems only for greater efficiency (you can read about the benefits of Sealed 'v' Open Vented heating systems here).
- Low output models in the range for smaller applications.
- Buy in confidence from a UK manufacturer with decades of commercial heating and hot water expertise.
- Extensive back up and support from our team of experienced engineers across the UK.
- Long term commitment to boiler spare parts.
- BIM objects available to assist in design and management
- Available for next day delivery (dependent on stock availability, charges may apply, order cut-off 12pm)
- Available from stock from your local Smiths Brothers Store
Technical data
| Units | S2-40 | |
|---|---|---|
| Energy | ||
| Building regulations Part L seasonal efficiency | % gross | 95.75 |
| SAP 2009 Annual efficiency | % | 89 |
| ErP efficiency rating (modules ≤ 70 kW only) | A | |
| Boiler output - maximum 80/60°C, NG & LPG.* | kW | 40 |
| Boiler output - maximum 50/30°C, NG & LPG.* | kW | 43 |
| Boiler output - minimum 80/60°C, Nat Gas. | kW | 8.3 |
| Boiler output - minimum 80/60°C, LPG | kW | 8.3 |
| Boiler input (gross) - maximum, NG & LPG.* | kW | 45.7 |
| Boiler input (nett) - maximum, NG & LPG.* | kW | 41.2 |
| Standby losses | W | 42 |
| Water | ||
| Water content | litres | 3.6 |
| System design flow rate @ 25°C ΔT rise | l/s | 0.39 |
| Water side pressure loss @ 25°C ΔT rise | mbar | 205 |
| System design flow rate @ 20°C ΔT rise | l/s | 0.47 |
| Water side pressure loss @ 20°C ΔT rise | mbar | 320 |
| System design flow rate @ 11°C ΔT rise | l/s | 0.9 |
| Water side pressure loss @ 11°C ΔT rise | mbar | 1058 |
| Minimum water pressure | barg | 1 |
| Maximum water pressure | barg | 4 |
| Maximum flow temperature setting | °C | 85 |
| Gas | ||
| Gas flow rate, NG (G20) - maximum | m³/hr | 4.4 |
| Maximum gas inlet pressure, Nat Gas | mbar | 25 |
| Nominal gas inlet pressure, Nat Gas | mbar | 20 |
| Minimum gas inlet pressure, Nat Gas | mbar | 17 |
| Gas flow rate, LPG (G31) - maximum | m3/hr | 1.7 |
| Nominal gas inlet pressure, LPG | mbar | 37.5 |
| Flue | ||
| Maximum flue gas temperature @ 80/60°C Nat Gas | °C | 80 |
| Pressure at boiler flue spigot @ 80/60°C Nat Gas | Pa | 156 |
| Maximum flue gas temperature @ 80/60°C LPG | °C | 81 |
| Pressure at boiler flue spigot @ 80/60°C LPG | Pa | 126 |
| Dry NOx emission (0% excess oxygen, mg/kWh dry air free) | mg/kWh | 36 |
| Electrics | ||
| Electrical supply | 230 V 1 Ph 50 Hz | |
| Power consumption - maximum boiler modulation | W | 68 |
| Start current (per module) | Amp | 1.2 |
| Run current (per module) | Amp | 0.3 |
| Approx shipping weight | kg | 50 |
| Noise emission @1m: @maximum modulation | dB (A) | 57.4 |
| Noise emission @1m: @minimum modulation | dB (A) | 34.3 |
| *(S2-120 & S2-150 models Nat Gas only.) |
Downloads
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Stratton mk2 brochureProduct brochures 4695 kb |
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Testimonials
Ideal uses/applications
- New build and retrofit projects.
- Smaller commercial and public buildings including community schools, care homes, hotels, churches and retail units.
- Small industrial and manufacturing premises.
Optional extras
- A large range of off the shelf flue options available.
- Room sealed and open flue solutions.
- Choice of pipe kits with low loss header (Want to know 'What is a low loss header?').
- Support frame kit.
- Flue header kits.
Single Boiler Controls
- Outside air temperature sensor QAC34 (Part no. 533901457).
- Domestic Hot Water sensor kit (sensor and pocket) (Part no. 563605674).
- Mixing valve heating circuit control kit (clip in control module, temperature sensor and pocket) for 1 zone (Part no. 059753) – Maximum 2 kits per boiler.
- Programmable room sensor QAA75 (Part no. 533901587).
- Offset adjustable room sensor QAA55 (Part no. 533901589).
Multiple Boiler Controls
- Outside air temperature sensor QAC34 (Part no. 533901457).
- Heating circuit sensor kit (sensor and pocket) QAZ36 (Part no. 563605609).
- Merley boiler sequence controller, wall mounted (Part no. 563605672).
- Merley boiler sequence controller, loose kit for panel mounting (Part no. 563605671).
- LPB Bus communication module OCI345, one required per boiler module (Part no. 563605667).
- Programmable room sensor QAA75 (Part no. 533901587).
- Offset adjustable room sensor QAA55 (Part no. 533901589).
- Choose from a wide range of service contracts to help maintain optimum performance.
- Book commissioning at the same time as placing your order for improved warranty terms.
Often bought with
Case studies
Riverside Childrens Centre, Canterbury
Sector: Education and childcare
Project: The nursery provides childcare and cooked midday meals for children. A hot water priority strategy using built-in boiler controls made the combination of a hot water circuit with a low temperature underfloor heating circuit possible.
Building: Nursery refurbishment
Application: Space heating, 43kW, indirect fired DHW
Learn more
Welcombe Hotel
Sector: Hotel
Project: Danny Bulch from Cedar Green selected a variety of Hamworthy products to suit different applications at the Hallmark Welcombe Hotel.
Building: Hotel plant room refurbishment
Application: Space heating 540kW/588kW/154kW; DHW 2,149 L/h
Learn more
Nottingham University
Sector: Education
Project: A four million pound development has seen the construction of two new sports pavilions with a high demand for hot water.
Building: New build, sports complex
Application: Space heating, domestic hot water
Learn more