We are having a combi boiler change along with replacement rads.
we have been advised to have a power flush by one plumber and another said a chemical clean would all thats needed.
Advice required please
Is it requirement by the boiler manufacturers to require a flush when commissioning a change of boiler ?
what do most plumbers do on a boiler change, power flush or chemical? or neither?
How is each carried out and what is the average cost of the different types of clean.