Storage water heater Sunsystem SWPNL300 — 300 L capacity with 3.3 m internal heat exchanger

The Sunsystem SWPNL300 is a storage water heater with a 300‑litre capacity and a 3.3‑metre internal heat exchanger designed to store domestic hot water and receive heat from an external source. The cylinder is intended for integration with boilers, solar thermal collectors or other central heating systems, enabling large‑volume hot water supply for residential and small commercial installations. The internal coil ensures efficient heat transfer while keeping potable water separated from the heating circuit.

Advantages

The Sunsystem SWPNL300 combines a high storage volume with an extended internal heat exchanger that increases contact area for better energy transfer. It supports connection to multiple heat sources and reduces the need for frequent heating cycles. The construction provides corrosion protection and thermal insulation to maintain water temperature over longer periods, and the unit is compatible with standard plumbing and control components used in domestic heating projects.

Suitable for

• Residential systems requiring large domestic hot water storage
• Small commercial premises such as guesthouses or offices
• Integration with solar thermal panels for seasonal heat storage
• Combination with boilers, heat pumps or other external heat sources

Key specifications

• Storage capacity: 300 litres
• Internal heat exchanger length: 3.3 metres
• Function: indirect storage water heater with internal coil
• Application: domestic hot water storage and heat exchange from external sources
• Typical installation site: indoor plant room or utility area

How to use

Install the Sunsystem SWPNL300 according to local plumbing and safety standards, positioning the cylinder on a stable, level base with adequate access for pipework and maintenance. Connect the internal heat exchanger to the chosen heat source circuit using appropriate fittings, valves and safety devices. Fill and vent the system, then commission by gradually heating and checking for leaks, proper flow through the heat exchanger, and correct operation of thermostats and safety controls. Regularly inspect insulation and connections and follow the manufacturer's maintenance recommendations for water quality and anode inspection where applicable.

Usage recommendations

For optimal performance, match heat source output and flow rate to the internal exchanger size, maintain water quality to reduce corrosion and scaling, and include appropriate safety valves and expansion vessels in the installation. Consider professional installation and periodic servicing to ensure reliable long‑term operation.