Wood Boiler Prity NS20, 21 kW

Wood Boiler Prity NS20, 21 kW – Reliable Central Heating with Wood and Coal

The Prity NS20 wood boiler is a compact and reliable central heating solution for a house, holiday home or one floor of a house. It runs on wood and coal and is designed for installation in basement and utility rooms. With a nominal back boiler output of 18.2 kW and a maximum heat output of up to 21.2 kW, the boiler heats an area of up to 115 m² (around 450–535 m³). In addition to space heating, the NS20 can also heat domestic hot water when connected to a hot water cylinder with a coil. The built-in capillary thermostat keeps the water temperature between 50°C and 90°C, and the mineral wool insulation reduces heat loss. With energy class A and an efficiency of 77.7%, the boiler provides economical heating. Made in Bulgaria by Prity 95 Ltd – a manufacturer of heating appliances since 1995.

Advantages of the Prity NS20 Boiler

• Central heating for up to 115 m² – back boiler output 18.2 kW and maximum output 21.2 kW.
• Wood and coal – flexibility in the choice of fuel.
• Domestic hot water heating – when connected to a hot water cylinder with a coil.
• Capillary thermostat (50–90°C) – automatically regulates the combustion air and maintains the desired water temperature, which improves economy.
• Mineral wool insulation – the steel heat exchanger is insulated to limit heat loss into the room.
• Large combustion chamber – measuring 435 x 430 x 385 mm, for less frequent refuelling.
• Ash drawer – below the combustion chamber, for quick and easy cleaning.
• Combustion inspection opening – monitor the fire without opening the door.
• Manual primary air and flue outlet dampers – for precise regulation of combustion and draught.
• Sturdy steel construction – 2 mm thick steel body, 3–4 mm top plate, powder-coated decorative side panels.

Efficiency and Energy Class

The Prity NS20 boiler meets the European Ecodesign requirements, which guarantees low harmful emissions, high efficiency and environmentally friendly combustion of fuel. With energy class A, an efficiency of 77.7% and compliance with the Ecodesign standard, it provides economical and eco-friendly central heating. CO emissions are 1031.3 mg/Nm³ (at 13% O₂), and the maximum flue gas temperature is 283°C. The chimney diameter is 130 mm, with a top outlet.

Important for Installation and Operation

• An open heating system is recommended. In a closed system, a 1.5 bar pressure relief valve is mandatory. The boiler has no built-in overheating protection or safety cooling coil.
• The boiler must be placed on a stable, level and non-combustible floor. The non-combustible base must extend at least 50 cm at the front and 30 cm at the sides.
• There must be no combustible objects within a radius of 80 cm around the boiler.
• Fresh air must be supplied to the room – at least 4 m³/h per kW of output.
• It is recommended that the boiler has its own dedicated chimney. Consult a specialist before connecting it.
• All parts of the system must be protected against freezing. With forced circulation, it is recommended to power the pump via a UPS. If there are copper elements in the system, protection against electrolysis (magnesium anode) is required.

Technical Specifications