Never had a problem with central heating descaler- household copper pipe is full of soldered joints without any issues:~
I've used it on the Volvo 240 and on the Riley for years- this car has mixed metals and a copper/brass radiator with solder joints and its been fine, in fact the Riley RM club generated the product for flushing many years back so a lot of cars have used the same.
The heater in these is quite small with very small water passages all soldered together- no floods have been reported! only that the water came out like tomato soup!
Hope it helps.
Bob.
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