Shock Arrestors

About our Shock Arrestors

Our range of Robokit sealed system kits are designed to make the installation of a sealed system as simple as possible. These reliable kits remove the need for feed and vent tanks in a central heating system and can reduce ongoing maintenance. Components required for a sealed system include an expansion vessel, filling loop, SRV, and mounting bracket. With this solution, installation is straightforward.

Robokit FAQs

What is a sealed system?

Sealed systems are the most commonly used form of system type in Europe and most of the world. A sealed system comprises an expansion vessel into which heated water can expand into. The pressurised vessel pushes water back into the system as the system cools.

Sealed systems do not require a feed and expansion tank, unlike an open-vented system, and use a pressure relief valve as opposed to an open vent pipe. The valve opens in the event of an over-pressure to release pressure.

What is a sealed system kit?

A sealed system kit includes all the essential components needed for a sealed system installation. The majority of our kits include an expansion vessel, filling loop, safety relief valve (complete with gauge), assembly connector and mounting bracket (please refer to product specifications to check contents of each kit).

Altecnic offer a range of different kits to accommodate different requirements. Our Robokit Compact offers the same high-quality performance as our standard Robokits but with a space-saving compact design that can fit in kitchen cupboards or storage. The Robokit Extra includes a nitrogen-filled expansion vessel which prevents permeation of the gas through the membrane, which can compromise the pre-charge pressure.

What are the benefits of a sealed system kit?

Sealed system kits are favoured by installers and specifiers as they offer:

- System flexibility due to component location options

- Cost savings due to considerably reduced installation time

- No feed and expansion tank, hence avoiding over-pumping problems, risk of freezing etc

- Longer life due to reduction of corrosion problems compared to an open-vented system

- Noise reduction due to higher system pressure, boiler noise (localised boiling) is significantly reduced or eliminated

- Low maintenance costs as equipment is low maintenance and recovered for periodic operational checks