I would suggest leaving x800 or x400 in the system for longer, as KIAB stays the x400 left for a prolongued period may be better in this case.

X800 | Central Heating Cleaner | Sentinel

Then I noticed on the Fernex web site (they are only selling the powder version) that DS40 cannot be used with single feed indirect cylinders, e. For the quickest clean, use Sentinel X800 Fast Acting Cleaner in conjunction with a powerflushing machine. With older systems, the specific problem which you are trying to address will dictate what cleaning chemical will yield the results you desire. FYI - I am trying to clean my central heating system as I suspect something may be blocked and is preventing the upstairs radiators from heating up. The water should then be circulated at normal operating temperatures for 2 hours before being flushed out.

Probably the most effective way to clean most of the muck from the system is to remove each individual radiator (possibly one at a time), removing its valves, then hosing through (outside! To clean an older system in accordance with BS 7593 it is recommended that this product is used withpowerflushing equipment. I prefer Sentinel as they seem easier to use but that may be because I largly stick to them so that I best understand their characteristics. Best practice, derived from documentation such as the UK Building Regulations Part L Domestic Heating Compliance Guide, is that a central heating system should be thoroughly cleaned and flushed out before the installation of a new boiler. litre, 1 300ml aerosol or 1 275ml tube of Sentinel X400 High Performance Cleaner is sufficient to treat a typical domestic system of up to 10 radiators.

Sentinel X800 Fast Acting Cleaner - Boiler Guide Sentinel X800 Fast Acting Cleaner - Boiler Guide

Sentinel's latest generation X800 Fast Acting Cleaner is now able to deliver superior cleaning of heating systems in as little as 1 hour!It acts as a dispersing agent, under neutral pH conditions, eliminating any concerns associated with traditional acidic cleaners.