Stratton mk2 wall hung boiler
Stratton mk2 wall hung boiler cutaway
Stratton mk2 wall hung boiler with pipework kits

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.

Efficiency 96 product icon
Fuel NG LPG product icon
Turndown 5 product icon
Warranty 5 heat exchanger product item
ErP Part L Compliant product icon
BIM objects icon

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.

Technical data

Compare models
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 0.4
Water side pressure loss @ 25°C ΔT rise mbar 205
System design flow rate @ 20°C ΔT rise l/s 0.5
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 1.5
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

Stratton mk2 brochure

Product brochures 3012 kb

Stratton mk2 dimensions

Dimensions 1498 kb

Stratton mk2 technical data table

Data tables 83 kb

AGU 2.550 Kit instructions

Installers guides 445 kb

Navistem B3000 controller instruction manual

Installers guides 2177 kb

QAA55 room unit programming instructions

Installers guides 153 kb

Siemens room operator units QAA55, QAA75, QAA78, AVS13, AVS14, AVS71

Installers guides 6621 kb

Stratton mk2 accessories AGU2-550 installation manual

Installers guides 442 kb

Stratton mk2 installation manual

Installers guides 4364 kb

Stratton mk2 pipe kit instructions manual

Installers guides 2341 kb

Volt Free Contact (VFC) and switch fitting instructions

Installers guides 1349 kb

Stratton mk2 scheme 1 sealed system with low loss header

Hydraulic schematics 295 kb

Stratton mk2 scheme 2 sealed primary, open vented second, plate heat exchanger

Hydraulic schematics 154 kb

Stratton mk2 S2-100 - pipe kit frame 1 boiler CAD

CAD 365 kb

Stratton mk2 S2-100 - pipe kit frame 2 boilers CAD

CAD 502 kb

Stratton mk2 S2-100 single boiler CAD

CAD 142 kb

Stratton mk2 S2-120 - pipe kit frame 1 boiler CAD

CAD 363 kb

Stratton mk2 S2-120 - pipe kit frame 2 boilers CAD

CAD 498 kb

Stratton mk2 S2-120 single boiler CAD

CAD 140 kb

Stratton mk2 S2-150 - pipe kit frame 1 boiler CAD

CAD 371 kb

Stratton mk2 S2-150 - pipe kit frame 2 boilers CAD

CAD 490 kb

Stratton mk2 S2-150 single boiler CAD

CAD 142 kb

Stratton mk2 S2-40 - pipe kit frame 1 boiler CAD

CAD 381 kb

Stratton mk2 S2-40 - pipe kit frame 2 boilers CAD

CAD 539 kb

Stratton mk2 S2-40 single boiler CAD

CAD 143 kb

Stratton mk2 S2-60 - pipe kit frame 1 boiler CAD

CAD 379 kb

Stratton mk2 S2-60 - pipe kit frame 2 boilers CAD

CAD 534 kb

Stratton mk2 S2-60 single boiler CAD

CAD 142 kb

Stratton mk2 S2-70 - pipe kit frame 1 boiler CAD

CAD 380 kb

Stratton mk2 S2-70 - pipe kit frame 2 boilers CAD

CAD 506 kb

Stratton mk2 S2-70 single boiler CAD

CAD 143 kb

Stratton mk2 S2-80 - pipe kit frame 1 boiler CAD

CAD 368 kb

Stratton mk2 S2-80 - pipe kit frame 2 boilers CAD

CAD 506 kb

Stratton mk2 S2-80 single boiler CAD

CAD 142 kb

Stratton mk2 - Single boiler pipe kit CAD

CAD 213 kb

Stratton mk2 SAP rating

SAP rating 45 kb

Stratton mk2 seasonal efficiency

Seasonal efficiency sheets 71 kb

Ideal uses/applications

Optional extras

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).

 

Often bought with

Commercial heating pressurisation unit

Chesil pressurisation unit

Learn more

Burstock expansion vessel for boilers

Burstock expansion vessel

Learn more

Halstock stainless steel calorifier

Halstock stainless steel calorifier

Learn more

You might also be interested in

Wessex ModuMax mk3 commercial floor standing boiler

Wessex ModuMax mk3 boiler

Learn more

Case studies

Riverside Children's Centre benefits from built-in boiler controls of their boiler to provide hot water efficiently.

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
The Welcombe Hotel in Stratford-upon-Avon benefits from a range of Hamworthy products.

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
Hamworthy's wall hung Stratton boilers and Dorchester DR-FC water heaters deliver efficient heating and hot water to Nottingham University.

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