The length of time will vary depending on the size of the system (number of radiators) as well as how contaminated the system is. The majority of power flushes are completed well within a day.
How Much does it Cost?
The price of a power flush Is calculated primarily on the size of the system (number of radiators)
however other factors will effect the powerflush cost such as the type of central heating system may effect pricing due to the extra care needed to tackle certain systems and increase the difficulty in powerflushing it
How long will the effects of a power flush last?
After a properly carried out Power Flush and with the proper maintenance the Power Flush should leave the system functioning efficiently for at least 6 years before another flush is needed. In some instances the way a system has been plumbed leads it to get contaminated at a faster rate.