I then opened all of the thermostatic valves on all 7 radiators, turned on the boiler by the mains and turned the temperature up to 25 degrees by the thermostat I located the drain valve just outside the property and opened it to drain the central heating system - left it for about an hour A constant flow of water kept on coming out of the radiator that is the closet to the drain valve which confuses me as no more water is coming out of the external and only drain valve X800 Fast Acting Cleanershould be circulated, preferably at normal operating temperature, with all valves open and the pump turned to maximum flow for a minimum period of 3 hours or until satisfactory performance is restored.

Sentinel's range of filters is crafted to fit any situation. The filters we offerrange from ultra-compact, where space is at a premium, through the compact Vortex300 and the larger Vortex500, which is also suitable for heat pump installations. Continues bleeding the radiators downstairs, starting with the closet to the boiler until no water or sound could be heard The Sentinel – X800 is a must-have for anyone with a central heating system. Whether you are a homeowner, a property manager, or a business owner, this product will revolutionize the way you maintain your heating system. By ensuring the optimal performance and efficiency of your central heating system, the Sentinel – X800 provides comfort and peace of mind to everyone who relies on it for warmth. Pros and Cons For details of how to dose using the Rapid-Dose format of this product, please watch the Rapid-Dose video. If a sealed system (combi, or non-combi but with no F&E tank but with an expansion vessel either inside the boiler or external to it) you will need to add the chemical another way. Often a tall towel type radiator will do. Turn off the boiler. Bleed water from a radiator bleed point until the boiler pressure drops to zero. Take the whole bleed plug (not just the square headed bleed screw) out of the top of the radiator, syphon out 1.5 litres of water and replace with the chemical. Replace the plug, top up the system water to normal boiler pressure (say 1.3 bar if you don't know what that is). Run the system as above. You will still have to do a full drain down and repeat a few times as above. If you don't have a suitable towel type radiator you can get the chemicals in various "easy add" versions. I've never found these easy to use.

Product manuals and instructions: filter and scale protection

Why? Removes potentially damaging contaminants and restores system effectiveness, reducing future breakdowns and increasing system life. Unrivalled chemical technology reduces circulation time to just 1 hour. Apply to: Restore circulation and effectiveness in systems older than six months that have a significant amount of corrosion debris causing poor circulation and cold spots. Prepare for the installation of new components. Sentinel X800 Jetflo is a powerful, highly active cleaning agent for use in central heating systems. It is specifically designed for use in conjunction with power flushing equipment and will remove objectionable iron oxide and calcium based deposits from heat exchangers, radiators and pipe work. Its unique composition allows Sentinel X800 Jetflo to act as a penetrating dispersant under neutral pH conditions, eliminating the need to clean with conventional acids and the problems associated with them. The formulation also contains agents to help protect metal from corrosion.

Versatility is another remarkable feature of the Sentinel – X800. Unlike other cleaners on the market, this product is suitable for both hot and cold central heating systems. Whether you have a residential or commercial property, the Sentinel – X800 is your go-to solution for maintaining optimal system performance. Professional-Grade QualityApply to: Remove residual flux, grease, oil and manufacturing & installation debris in systems under six months old To clean an older system in accordance with BS 7593 it is recommended that this product is used withpowerflushing equipment. In this scenario, administer Sentinel X800 Fast Acting Cleaner via thepowerflushing equipment, following theequipment manufacturer's instructions. Alternatively, circulate theproduct (preferably at normal operating temperature, with all valves open and the pump turned tomaximum flow) for a minimum period of 1 hour or until satisfactory performance is restored. Recommended dosage: 1 litre of X800 is sufficient to treat a typical domestic system of up to 10 radiators. For maximum performance circulate from 1-24 hours.X800 is non-aggressive and can be left in the system over 24 hours, however this may cause debris to re-settle reducing effectiveness. If an open system you will have a small (4 gallon) tank in the loft. Turn off the boiler and water feed to the tank. Remove all the water (which is likely to be filthy) from the small (Feed and Expansion F&E)) tank. Drain some more water from the system (3 or 4 litres) and add the chemical to the tank. Turn on the water feed and let the tank fill until it stops normally. Turn on the boiler, and run the system. After a suitable period (max. 4 weeks for X400, say a day for X800) drain the system, refill and repeat two or three times. What next? Add Sentinel X100 inhibitor, to prevent corrosion and the build-up of limescale, the main causes of central heating and boiler inefficiency.

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. Larger systems should be dosed with twice this amount.As for new systems, X300 Cleaner for New Systems is designed to target installation and manufacture debris and contaminants. Once cleaned, it will passivate the metal surfaces and prevent copper deposition. Sentinel X800 Fast Acting Cleaner should be used as a 1% solution in mains water to remove typical levels of deposits of iron oxide and calcium carbonate. Where systems are badly fouled, a higher concentration (up to 10%) is recommended.