Buffer tank KOSPEL SV-400.1 unenameled in insulation, 400 L capacity

Buffer tank KOSPEL SV-400.1 unenameled in insulation, 400 L capacity is a steel thermal storage vessel intended for hydraulic separation and heat accumulation in central heating installations. With a nominal volume of 400 litres and unenameled steel construction, the tank offers substantial thermal mass for stabilising system temperature and reducing frequent cycling of heat sources such as boilers, heat pumps or solar thermal collectors. The external thermal insulation reduces standby heat losses while the unenameled interior is suitable for systems where enamel coating is not required or where additional internal treatments are planned.

Advantages

The buffer tank provides effective hydraulic separation between the heat source and distribution circuits, helping to stabilise flow and pressure. Its 400 L capacity increases accumulation capability to reduce short cycling of boilers and heat pumps and to improve overall system efficiency. Steel construction without enamel offers robust mechanical strength and straightforward compatibility with various connection and maintenance practices. External thermal insulation minimises heat loss during standby periods and contributes to consistent delivery of stored heat.

Suitable for

• Integration with gas, oil or biomass boilers for central heating and hot water systems
• Coupling to air-source or ground-source heat pumps to improve cycling and performance
• Connection with solar thermal installations to store collected heat for later use
• Systems requiring hydraulic separation between multiple circuits or heat sources

Key specifications

• Nominal volume: 400 litres
• Construction material: steel (unenameled interior)
• Thermal insulation: external insulation shell to reduce standby losses
• Purpose: hydraulic separation and thermal energy accumulation in heating systems
• Typical applications: boilers, heat pumps, solar thermal integration

How to use

Install the buffer tank according to local plumbing and heating regulations, ensuring correct orientation and secure connections to primary and secondary circuits. Provide appropriate mounting support for the tank weight when filled. Connect supply and return lines with suitable fittings and, where required, include valves, pumps and sensors to manage flow and temperature. Commission the system by filling, venting air, and checking for leaks; set control parameters on the heat source and circulation pumps to take advantage of the tank’s storage and separation functions.

Usage recommendations

For reliable performance, select pipework, pumps and control strategies sized for the tank’s 400 L capacity. Regularly inspect insulation and external surfaces for damage, monitor system water quality to prevent corrosion in an unenameled tank, and follow manufacturer instructions for maintenance intervals. When integrating with solar or multiple heat sources, use appropriate stratification and charging controls to maximize stored energy usability.