X800 - x400 or F3

[c.gas]

Which would you guys recommend for the job, got an isar that's got a partially blocked main heat exchanger as you can hear it whilstling when you run ch or dhw. My plan was to try a cleaner in it and leave it for a couple of days as the customer is home for a day on Tuesday and then back on Thursday so can go back and drain it. Is x800 to aggressive to leave for that long as don't want to kill the heat aluminium heat ex

 

[Billy Bob Bob]

Would not personally put X800 in,would talk to them about changing TBH a ISAR is a reight heap

 

[c.gas]

I agree but customer wants to try the cheaper option first so it's not for me to decline really

 

[AWheating]

x800 only works for 24hrs max, x400 would be better (this is from sentinel tech reply to a question i asked). both wont attack the HX. F3 is good, F5 is stronger but not sure on its lifespan.

 

[jtsplumbing]

Just cover your backside, tell customer that you can add a cleaner if he wants to risk it, let him decide.

 

[Riley]

These chemicals very rarely help a hex. I had some success yonks ago helping a friend of mine out who had absolutely no money at all Took the hex off his old halstead and we painstakingly swilled it through with a strong acidic cleaner. Not the perfect scenario I grant you but he was happy when the boiler work properly again

 

[c.gas]

Yeah I've done that myself on a Heatline Vizo using one shot drain cleaner and it worked a treat, don't fancy taking the heat ex out of an isar really

 

[townfanjon]

Yep another one for NO x800 , x 400 defo ok