I want to clean my sealed central heating system with a relevant cleaner. Can anyone recommend one to use and also briefly explain how to carry it out. Im guessing it has to go through the filling loop to enter the system?? Will all the instructions be with the cleaner and are there any things to aware of? I would like to do it now as the system is being used alot at the moment. Any info would be gratefully received.
Not to my knowledge. The water was pretty dirty when i drained the system to change a rad but when re-filling i didn't put any inhibitor in or cleaner of some sort. It's just a piece of mind thing really
quite common for heating water to look dirty when draining. it's not that much of a problem (or unavoidable at least) if there is no sludge, sediment or gritty material.
if you've drained it down and refilled then that will have flushed it. i'd be inclined to drain down again and refill. add a good quality inhibitor such as fernox, if not gunked up then system cleaner should not be necessary, a flush and refill with fernox should be sufficient.
depending on the age of the system and when it was last flushed would determine whether or not to clean is necessary. a bit of a job as you have to add the cleaner, run the system for a while then drain, flush, fill with a neutraliser, run for a while, drain, flush then refill again adding inhibitor on the final fill. still, it wouldn't do your system any harm whether strictly necessary or not.
to add inhibitor to a pressurised system can be done in two ways. if you have a towel radiator in the bathroom then prior to refilling the system i remove the blanking plug and add it in there with a funnel.
if you don't want to drain down again then you can use one of these:
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