Power flush before blocked heat exchanger renewal ?

[Graham Humber]

Do you know why it wasn’t flushed straight away?

They only allowed for a chemical flush in the initial install, power flush was done after about a fortnight of them messing around trying to get the system to flow. Power flush was done when they change it from the original open vent system to closed system to get the flow so they said. Previous oil boiler although old and in need of replacing was still able to get flow round the system fine

 

[king of pipes]

The damage was done in that 2 week window in my opinion ,open vented systems can be notoriously dirty add in the fact it was a oil boiler then converted to gas more protection and care was need. Kop