Wolf buffer tank SPU-2-2000 2484706

Vertical buffer tank with a capacity of 2000 L, made of black steel

The tank is intended exclusively for closed‑loop boiler installations, where the heating water is not exposed to oxygen – it has no internal anti‑corrosion protection, therefore it must not be used in open systems or where there is a risk of air entering the circuit. Its design allows cooperation with various heat sources: solid‑fuel, gas or liquid‑fuel boilers, as well as solar systems – in the version with a coil (SPU-W) direct integration with solar collectors is possible.

Polyurethane foam insulation 100 mm thick reduces heat loss in standby mode. The external insulating jacket can be removed before installation – this eases transport and delivery to the installation site and also provides flexibility in confined access spaces.

Construction and installation

The tank has a diameter of 1100 mm (without insulation) and a height of 2400 mm – with insulation the dimensions increase to 1300 mm × 2480 mm. The lifting height (Kippmaß) is 2550 mm without insulation and 2800 mm with it. Total mass is 253 kg. All connections are internally threaded: eight openings for heating pipes of diameter Rp 2", four thermometers Rp ½", and one vent Rp 1¼". Maximum working pressure in the secondary circuit is 3 bar, and the operating temperature must not exceed 95 °C – complying with DIN 4753 and DIN 12828.

Installation must follow the manufacturer’s instructions and be carried out only by authorized installers. The tank does not contain an internal heat exchanger – if integration with solar collectors is required, the SPU-W version must be selected.

Application and limitations

The tank functions as a thermal buffer – it stores excess heat from the boiler or solar source and releases it gradually when demand is lower. It performs well in systems with solid‑fuel boilers, where it smooths the boiler’s operating cycles, or with heat pumps that run longer at lower power. The tank has no built‑in electric heater – any additional heat source must be connected externally. It must not be installed as part of an open heating circuit – the lack of internal anti‑corrosion protection means that even brief exposure to oxygen can cause rapid corrosion of the tank walls.