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combi system...inhibitor required

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Sorry for what maybe a very basic question. I have removed all rads. Will replace with new. Got a valliant combi system. Will an inhibitor be required once rads are put back on. Thanks.
 
yes

If the water seems dirty or sludgy, consider giving the system a chemical clean as well. The chemicals are cheap.

It is worthwhile to add a system filter to prevent disturbed dirt flowing through into the boiler and causing a distressing blockage, especially if the system is old. It would cost you about £100.
 

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