Wood Burning Stove with Back Boiler Prity S3 W21, 16.4 kW

Wood Burning Stove with Back Boiler Prity S3 W21 – The Most Powerful Model in the S3 Series

The Wood Burning Stove with Back Boiler Prity S3 W21 in an elegant black graphite finish is designed for multi-room homes, holiday homes and larger houses that need stable, long-lasting heat. The unit delivers 5 kW directly to the room by radiation and up to 21 kW to the back boiler, which supplies the radiators of the central heating system. The approximate heated area is up to 148 m² (volume 485 – 580 m³). This is the most powerful model in the S3 series, with an additional upper door for easy cleaning of the heat exchanger. With energy class A and an efficiency of 75.3% the stove provides powerful and economical heating. Made in Bulgaria by Prity 95 Ltd – a manufacturer of heating appliances since 1995.

Advantages of the Prity S3 W21 Stove

• 29-litre back boiler – a large volume for even heat supply to many radiators, with 1" connections for hot and cold water.
• Second upper door – provides easy access for cleaning the heat exchanger and maintains the unit's efficiency.
• Wide combustion chamber – measuring 295 x 430 x 425 mm, it takes logs up to 420 mm and extends the burn time.
• Sturdy steel body – made of steel sheets with a thickness of 2 mm, and the top plate of steel with a thickness of 3–4 mm.
• Thermal shock-resistant ceramic glass – the combustion chamber is fitted with high-temperature-resistant glass that gives a clear view of the flame.
• Cast iron grate – resistant to high temperatures and ensuring even combustion.
• Combustion control damper – located at the front, it lets you control the intensity of the flame.
• Manual flue outlet damper – for precise adjustment of the chimney draught.
• Wooden door handles – for convenient and safe use.
• Decorative cladding on the sides for a finished, stylish look.

Efficiency and Energy Class

The Prity S3 W21 stove complies with the European Ecodesign requirements, which guarantee low harmful emissions, high efficiency and environmentally friendly burning of wood. With energy class A, efficiency of 75.3%, compliance with the Ecodesign standard, CE certification and a 3-year warranty, it provides economical and eco-friendly heating for the whole home. The chimney diameter is 130 mm with a top flue outlet, allowing easy connection to a standard chimney system. The required chimney draught is 11 Pa.

Important Notes on Installation and Operation

• The stove must not be used without radiators and/or convectors installed – firing with an empty back boiler will cause it to crack.
• It is recommended that the central heating system be of the open type. A closed system requires a mandatory pressure relief valve set at 1.5 bar.
• In systems with forced circulation, it is advisable to connect the circulation pump to a UPS.
• If the system contains copper components, it must be protected against electrolysis, for example with a magnesium anode.

Technical Specifications