On 22/03/2018 07:36, Rednadnerb wrote:
On Wednesday, March 21, 2018 at 10:10:29 PM UTC, Fredxx wrote:
On 21/03/2018 20:35, Tim+ wrote:
My mother has had some combi boiler trouble recently, first a diverter
valve that wasnt switching properly when HW was called for and now a
mysterious leak from somewhere internal.

According to the Scottish Gas fitters, bits were heavily sludged. As a
special offer theyre offered to come back tomorrow and powerflush the
system for £600 but they want a quick decision which rings alarm bells with
me.

Is this a typical price for the service or are they lying swindling
*******s? Is it the sort of thing than can be done by any competent heating
engineer and what should one expect to pay?

This is a DIY group!

You can take the radiators off yourself and flush them with a hose!

You can always find someone else cheaper who doesn't give you a deadline
to accept their offer.

I am also in the position of having to decide whether to get a powerflush or take off the worst offending rads and clean them out. The worst offending rads are on the ground floor.
Does anyone know whether sludge settles evenly throughout the system or does it tend to settle in the ground floor rads?

It does not settle evenly, but its harder to identify where it will
settle. It tends to be places where there is less flow velocity, but can
equally be where there are branches or restrictions, or more "difficult"
escape routes for the water. Those places may be downstairs, but could
equally be elsewhere.


--
Cheers,

John.

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Recently flushed my sons system ..... put in a cleansing solution, run
system for a week ...
Opened all lockshield valves .. and thermostatic valves to max ..... got
system nice and hot and drained it ... them connected up a hose run it
until l all drain points run clear.

Filled and emptied a couple of time.

Then filled and added inhibitor.

May not have got rid of all .... but got rid of a lot.