When a boiler’s internal expansion vessel fails, it leads to constant pressure drops and safety valve leaks. The Varem FLATVAREM series is the industry-standard replacement solution. These tanks are specifically designed for the tight internal compartments of modern gas boilers, where a standard cylindrical tank simply won’t fit.
 
Whether you need the circular 325mm diameter, the larger 385mm version, or the rectangular/oval models for narrow boilers, Varem offers the exact dimensions required for a seamless installation.
Key Technical Specifications:
Max Pressure: 3 Bar (Standard for residential boilers).
Pre-charge: Factory pre-charged for immediate use.
Connection Sizes: Available in 3/4" and 3/8" male threads (check your original tank for compatibility).
Vessel Types: * Circular: For standard wall-mounted units.
Rectangular/Oval: For compact and space-saving boiler models.
Operating Temp: -10°C to +99°C.
 
Installation Tip: Always measure your original vessel’s diameter and thickness before ordering. The connection thread (3/8" vs 3/4") is critical for a direct fit without adapters.