Expansion/Buffer Tank Galmet 140 for Gas Boilers SGW(S) Rondo, polyurethane foam insulation, class A

Galmet 140 is an expansion and buffer tank designed for gas boilers of the SGW(S) Rondo series. The compact insulated vessel increases system water volume to reduce boiler cycling and stabilise pressure fluctuations. Polyurethane foam insulation minimises heat loss and helps maintain thermal stability in residential and light commercial heating installations. The unit is classified as class A and engineered to integrate directly with compatible Rondo boilers for hydraulic balancing and improved operational durability.

Advantages

The Galmet 140 combines a compact footprint with effective thermal insulation to preserve system temperature and reduce energy waste. By adding buffer volume, it lowers the frequency of boiler starts and stops, which can extend boiler life and improve comfort through steadier temperatures. The polyurethane foam jacket provides long-term insulation performance without significantly increasing the tank’s external dimensions. Installation is intended to be straightforward when paired with SGW(S) Rondo gas boilers, supporting reliable hydraulic balancing and pressure dampening.

Suitable for

• Residential central heating systems using SGW(S) Rondo gas boilers
• Light commercial heating installations requiring compact insulated buffer capacity
• Systems needing improved hydraulic balancing and reduced boiler cycling
• Applications where minimising heat loss from the expansion/buffer tank is important

Key specifications

• Function: combined expansion and buffer tank
• Tank volume: 140 litres nominal capacity
• Insulation: rigid polyurethane foam jacket
• Insulation class: A
• Application: compatible with SGW(S) Rondo series gas boilers
• Mounting: free-standing or floor-mounted integration in boiler room layouts
• Primary benefit: increases water volume and provides pressure stabilisation

How to use

Install the Galmet 140 adjacent to the SGW(S) Rondo gas boiler following the boiler manufacturer’s piping and hydraulic connection guidelines. Ensure the tank is connected to the heating circuit at the recommended connection point to allow proper exchange of water between the boiler and buffer tank. Commission the system by filling, venting air pockets, and setting the system pressure within the parameters specified for the boiler and heating installation. Periodically check for proper insulation condition and absence of leaks as part of routine heating system maintenance.

Usage recommendations

For optimal performance, match the tank installation to the hydraulic scheme provided by the boiler manufacturer and size the buffer volume in relation to system capacity. Regularly verify system pressure and inspect connections to maintain reliable pressure stabilisation and reduce cycling. In environments with extreme temperature variations, ensure insulation integrity to preserve thermal stability.