Warmflow Engineering Ltd


HETAS ID: J51305
App. Type: Independent Boilers
Fuel Type: Pellet, -
Certificate Ref: AA-2014-39/01
Std. Tested to: BS EN 303-5:2012
Hearth Req: Constructional
Manufacturer Address: Lissue Industrial Estate, Moira Road, Lisburn, Northern Ireland, BT28 2RF
Manufacturer Email: [email protected]
Telephone Number: 028 9262 1515


HETAS has audited and verified that all applicable clauses in the test report have been passed in respect of the materials, design, and construction in accordance with the relevant BS EN type test standard for the appropriate technology, performance criteria of which is below;

Net Efficiency - Pellet - Full Load 92.9%
Gross Efficiency - Pellet - Full Load 85.7%
Net Efficiency - Pellet - Part Load 90.1%
Gross Efficiency - Pellet - Part Load 83.1%


In support of reducing the impacts of particulate emissions on the UK's overall air quality targets, HETAS “Cleaner Choice” appliances have been independently verified as exceeding the current requirements for UK smoke control areas for particulate matter, including PM2.5's by 50% of that required by DEFRA;


Improvement on Clean Air Act Particulate Limit – Full Load


Improvement on Clean Air Act Particulate Limit – Part Load


The product certified has been assessed for its suitability for installation in domestic properties against the requirements of the Building Regulations and appropriate standards. The performance of the appliance has been verified as meeting the following technical performance attributes;

Combustible Clearances - Rear 100 mm
Combustible Clearances - Side 50 mm
Hearth Temperature > -
Appliance Spigot SIze 80 mm
Minimum Flue Diameter 125 mm
Recomended Flue Draught 15Pa
External Air Supply Compatible *No

*HETAS product approval is not valid for appliances fitted with an external air supply ducted directly to the appliance. The installer should reference HETAS technical note TN_0020 General Guidance for the Installation, Risk Assessment & Commissioning of Solid Fuel Appliances with a Dedicated External Air Supply for more information.

Technical Data

The purpose of this HETAS Stove Approval Scheme is to help consumers, retailers, installers and others to identify stoves with lower particulate (PM) emissions. There are concerns that small particle emissions known as PM2.5 to PM10 can be harmful. For that reason, we are operating a scheme which only accepts appliances that are tested to emit lower emissions compared to the current legal requirements. We have chosen to set the bar for entry at 50% less emissions than required for exemption for use in smoke control areas in the UK. We also note that Ecodesign legislation has differing, but important limits for other emission and any appliances listed here must meet those requirements as well as exceeding the particulate emission values for exemption by at least 50%.

Additionally, the product certified has been assessed for its compliance against the legal requirements for emissions and efficiency stipulated within the Ecodesign regulations. The performance of the appliance has been verified as meeting the following environmental attributes;

PM - Pellet 15.7 mg/m3
OGC Emissions - Pellet 5.9 mg/m3
CO Emissions - Pellet 70.3 mg/m3
NOx Emissions - Pellet 141.4 mg/m3
Seasonal Efficiency - Pellet 81.41%

Appliance Dimensions

Height 1135mm
Width 650mm
Depth 1170mm

Technical Downloads

Copies of the associated manufacturer technical literature, energy labels, instruction and operating manuals and supporting documentation on performance and safety can be found by following the links below.

Instruction Manual Reference Boiler Manual - Wood Pellet Boiler WS18/WP18-01.02.2015-v4
DoP Cerificate Referece WDC035

Document library


File name



Warmflow Boiler Manual WS18 (new)



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Warmflow Engineering Ltd



Product Type Independent Boilers

Fuel type Pellet, -

Cert. Ref. AA-2014-39/02

Std. Tested to BS EN 303-5:2012

Hearth Req. Constructional


HETAS, Severn House, Unit 5 Newtown Trading Estate, Green Lane, Tewkesbury, GL20 8HD