X800 and X300 sound like Sentinel which seems to be a quality brand. But X300 is not an inhibitor.Cheers found it - says
brand is blank
and inhibitor "x300"
Rads were only hot for about 30 mins until they finished and not all valves were turned to on.
Could they have actually done a proper job but I should've specified a more in depth clean?
X800 is a fast-acting flush chemical for old systems and was probably the correct product. X300, however, is a new system cleanser designed to remove grease, flux, and copper filings and should be removed within 24 hours. Then the system should be drained and filled with an inhibitor (e.g. X100).
Is the guy a surgeon by trade who just does a bit of plumbing in his spare time, or just incapable of reading and following basic instructions? At this point I'd be calling Gas-Safe and saying you have safety concerns about your new system as I'd like to know what else he's got up to!