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power flush

(20 Posts)
christilass Mon 17-Feb-14 21:45:58

Hi , can someone in the know give an idea of cost to have this done .. Thank you

Patchouli Mon 17-Feb-14 22:55:00


How urgent is it?

Haribolover Tue 18-Feb-14 09:14:09

About £500 with British Gas last time I had it done, probably cheaper with a local plumber.

PigletJohn Tue 18-Feb-14 09:16:36

it will cost some hundreds of pounds. If done properly it will take more than half a day. It is not always done properly. It is a good moneyspinner for people in the boiler repair business, which is why they encourage people to have it done. It is often worthwhile in a 30-year old system; and it is often necessary when there is a fundamental defect in the design of the system, allowing air or fresh water to enter. If you have a defect then you are wasting your money on a powerflush if you don't have the defect corrected first.

Very often a DIY chemical clean will help a lot, if you are fond of DIY, and might cost you £30 plus a couple of half-days.

Why do you want it?

OnePlanOnHouzz Tue 18-Feb-14 09:17:58

found this on
...Cost and time needed for a powerflush
Most powerflushing professionals state that a full powerflush will take around 6 hours to complete. This is an estimate though as some badly affected heating systems will require more time whilst others may be finished quicker.
The price of a full system powerflush varies with location and the size of the heating system and can range from £350 up to £1200+. Occasionally the descaler isn’t included in the original quoted price and needs to be paid for on top.

so a bit more than just a bottle of Fernox then ! wow !!!

AnotherWorld Tue 18-Feb-14 10:55:04

We had ours done a couple of years ago when we had boiler replaced. It went from a bubbly noisy system to totally silent. Well worth the £700 - we also had a filter fitted to catch all the debris.

fludnelb Tue 18-Feb-14 12:07:28

We need to have this done - old system with lots of gunge - and our plumber has quoted us £450. I was a bit surprised as he charged us £500 for a full bathroom refit a couple of years ago... but I guess he has to make his money somewhere and it seems a good price anyway to what others are saying.

PigletJohn Tue 18-Feb-14 12:28:04

if you have it done (or if you do a DIY chemical clean) I strongly advise having a system filter fitted at the same time. It will cost round about £100 plus fitting, which is easier when the system is drained during cleaning.

wonkylegs Tue 18-Feb-14 12:47:03

I don't know how much ours cost as it was part of a larger job. It took 2 days (2 flushes on a large system that hadn't been touched in over 25yrs) but made a huge difference to the performance of the radiators. We also got a Magnaclean system fitted which helps with the residual gunk.
I wouldn't bother with a new system but one like ours with 30yr+ old rads & pipes that are heading for about 50-60yrs old in places, it made a huge difference.

christilass Tue 18-Feb-14 15:06:31

Thanks everyone.
new boiler fitted 2 years ago
rads etc approx 25 urs old
2 weeks ago shower started cutting out after 7 mins had to reset boiler to resume shower .
bosh came out yesterday under guarantee, turned boiler down a little and put chemical flush through , shower ok at the moment
engineer has advised power flush to be carried out , engineer says of shower then starts cutting out again it means the heat exchanger has been damaged and will need replaced ,this will only be replaced under the guarantee if i have the paperwork stating the power flush has been carried out .
thanks everyone who has taken time to read and reply
any further advice would be great thank you

miffyt Tue 18-Feb-14 15:14:13

We have British Gas cover on the central heating. Every time they came to service the boiler they would mention a power flush. The system is 15 years old but it has bits of metal in from when it wad fitted. We ended up having a Magnaclean fitted. I can't just remember how much it cost but it was less than BG quoted for the flush. Not had any problems with it since then.

specialsubject Tue 18-Feb-14 15:16:13

if you have microbore pipe then powerflush deemed waste of time. Gentle chemical clean, leave for a few days, flush out.

magnaclean supply and fit for £100, you will need to clean it yourself every few days to start with, then reducing - we now do ours once a month. Simple process but do open and close valves in the right order!

Lagoonablue Tue 18-Feb-14 16:26:35

Bloody British Gas! Yes they advised a power flush for us recently due to some corrosion they saw on a part they replaced. Hmmmmmm. Now it has been advised, if there is any further problem, such as a part requiring replacement or whatever then they will not cover it under their cover scheme. I think it's a con.

PigletJohn Tue 18-Feb-14 18:40:43

If somebody installed a new boiler on a 25 year old system 2 years ago, and did not thoroughly clean the system first, then they are at fault and did not install the boiler in accordance with manufacturers instructions.

Was the boiler installer a reputable company, and are they still in business? You have grounds to claim against them.

christilass Tue 18-Feb-14 22:25:41

Hi Piglet
yes it was a reputable company , still in business , infact he has quoted me £350 to power flush it , he tells me he powerflushed it when he installed it ,
piglet what should I do ?

christilass Tue 18-Feb-14 22:29:34

Hes also said its on the benchmark which is also my service book .

PigletJohn Tue 18-Feb-14 22:47:38

show the powerflushing evidence to the engineer. Did he test the water quality? Has the boiler got a pressure gauge on the front?

Have you got microbore piping to the radiators (about the size of a pencil?) Do you know how long the flushing took?

I would be happier if you had a system filter installed. You could get that done now.

Have you told the installer that the makers are complaining the system is dirty?

christilass Thu 20-Feb-14 11:51:59

Hi piglet
my original installer of boiler is Convinced that its the shower that's the problem , so much so that hes going to come and look at shower and test it next week .
he has also told me that he put through chemical flush as per the boliers manufacturing guidelines when he installed it but made no mention of it being a powerflush .
he also tells me my previous boiler was a closed system

im concerned as bosh engineer says i must have it power flushed now to keep my guarantee.
i don't want to pay £450 if not needed but feel like im in a corner.
any further help piglet would be fab , thank you .

PigletJohn Thu 20-Feb-14 12:20:09

Have you got microbore piping?

A chemical clean can do a lot of good, especially if a filter is fitted. A powerflush is better, especially if a filter is fitted. Some installers insist on fitting them to reduce callbacks.

Chemical clean is much cheaper.

If a powerflush is necessary to validate the guarantee I think you ought to do it. Either way, get a system filter. You will see from the amount of sediment it captures is your system is dirty.

Beardedandhappy Sun 10-Sep-17 09:59:06

Message deleted by MNHQ. Here's a link to our Talk Guidelines.

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