BURNiT SNS SWPN-2L 300 - Hot Water Cylinder with Enlarged Heat Exchanger (300L)

BURNiT SUNSYSTEM SWPN-2L 300 Hot Water Cylinder for Heat Pumps

The BURNiT SUNSYSTEM SWPN-2L 300 is an indirect domestic hot water cylinder with a nominal capacity of 300 litres, specifically developed for hot water production using heat pumps. Combining an enlarged heat exchanger, an enamelled steel tank and high-performance thermal insulation, this cylinder is designed for modern installations where efficient heat transfer is essential.

The SWPN-2L series is intended for use with external heat sources operating at relatively low flow temperatures, such as air-to-water heat pumps. Its enlarged heat transfer surface supports efficient heating of the stored domestic hot water.

Enlarged 4.46 m² Heat Exchanger

The SWPN-2L 300 features a paired heat exchanger with a total surface area of 4.46 m² and an internal volume of 28.82 litres. The twin-coil arrangement forms a single hydraulic circuit with one flow and one return connection.

The enlarged heat transfer surface supports efficient heat transfer, even at the relatively low flow temperatures used in heat pump systems. Under the specified manufacturer test conditions, the heat exchanger delivers 32 kW at a heat transfer fluid temperature of 55 °C and a flow rate of 3.06 m³/h. Actual performance depends on the connected heat source, temperature differences and hydraulic operating conditions.

Enamelled Steel Tank with Corrosion Protection

The storage tank is manufactured from S235JR steel and protected internally with a titanium enamel coating. A magnesium anode provides additional protection against corrosion and helps protect the tank during operation.

For periodic maintenance, the cylinder features an inspection opening with flange. The magnesium anode can be inspected and replaced when necessary in accordance with the manufacturer's maintenance instructions.

High-Performance PU Insulation for Energy-Efficient Storage

The cylinder is insulated with 50 mm rigid polyurethane foam to reduce heat loss during storage. The exterior is finished with a protective PVC jacket in RAL 9006. BURNiT specifies energy efficiency class B for the SWPN-2L series.

The vertical construction has an overall height of 1520 mm and a diameter of 660 mm including insulation, according to the SUNSYSTEM 2026 catalogue. The cylinder is designed for floor-standing installation in an appropriate technical room.

Technical Features

• Nominal capacity: 300 litres
• Heat exchanger surface area: 4.46 m²
• Heat exchanger volume: 28.82 litres
• Heat exchanger output: 32 kW under manufacturer test conditions
• Maximum tank operating pressure: 8 bar
• Maximum heat exchanger operating pressure: 16 bar
• Maximum tank temperature: 95 °C
• Maximum heat exchanger temperature: 110 °C
• Insulation: 50 mm rigid PU foam
• Height: 1520 mm
• Diameter including insulation: 660 mm
• Empty weight: 170 kg

Connections and Optional Accessories

The SWPN-2L 300 is equipped with connections for cold water, hot water, domestic hot water recirculation and the heat exchanger flow and return. The cold water inlet, hot water outlet and heat exchanger connections have a nominal 1-inch female thread (Rp 1"). The recirculation connection features an Rp 3/4" female thread.

Additional connections are provided for temperature sensors, venting and draining. An optional 4.5 kW electric heating element can be installed using the designated connection. This element is not included as standard.

Installation and Application

The BURNiT SUNSYSTEM SWPN-2L 300 is designed for domestic hot water production using an external heat source. When combined with a heat pump, the available heating capacity, required hot water temperature, flow rate and heat exchanger performance must be considered together.

The cylinder is designed for vertical floor-standing installation. Allow sufficient clearance for pipe connections, inspection and maintenance. Installation and commissioning must comply with the manufacturer's instructions and applicable installation regulations.

Hewa supports installers in selecting suitable domestic hot water cylinders and matching installation components for heat pump systems.