Welcome to Quotation Check – Your guide to home improvement prices in the UK
This page is all about central heating power flushing.
Central heating systems can become clogged with rust, sludge and scale from the water that’s pumped around the pipework.
Common symptoms and problems are:
- Cold spots on radiators
- Noises coming from the system
- Slow warm-up times
- Wear and tear on the pump and other parts
Our Guide to Power Flushing Prices
In 2014 and again in 2018 we sent out quote requests to central heating engineers and specialist firms.
We asked each of them to provide us with a price to power flush a central heating system in a 3-bed house.
Below you’ll see the results of our research, we think this information is very insightful and should give you a very good idea of how much central heating power flushing will cost.
The last time we updated our prices was on the
You can arrange a custom quote for yourself by filling out the form on this page.
How Many Firms Responded to Our Request?
We sent out a total of 29 requests but only 23 firms responded and provided us with prices for power flushing.
The lowest price we were given was £225 while the highest was an eye-watering £700.
What You Get For Your Money
Power flushing is a technique used to clear out sludge from central heating system pipes, radiators, coils and heat exchangers.
These are areas where scale and corrosion are most likely to collect and cause problems.
This is how a power flush is done (we based this list upon the written quotes provided to us):
- Note the temperature of each radiator (so we know which ones are clogged)
- Record TRV settings for each radiator
- Take a water sample
- Open all valves and remove the TRVs
- Bridge any valves or equipment that may prevent a reverse flow, for example, a pump
- Isolate the boiler
- Connect the power flushing unit
- Power flush the system and loosen any stubborn particles from the radiators with a vibrating tool
- Take the temperature of individual rads and compare to original radiators
- Test water the water for purity
- Add a rust inhibitor
- Refit the radiator valves and the apply original settings
Cost to Power Flush – Updated Prices For 2018
Below you can see the results of our research into power flushing prices.
As we sourced prices from both small and large firms from various locations around the UK, we have tried to display the average prices by business size and locale.
The average price we received was around £450. This is slightly less than the average price we sourced in 2014 which was £475.
|Location||Small Business /Trader||Larger Business (5+ employees)|
|Need a Custom Price? >|
|South, SW and Midlands||£425.00||£525.00|
|Outer Region and North||£350.00||£500.00|
Get a Custom Quote Today
We think our research is insightful but if you would like to arrange a fixed written quote for a pro to power flush your heating system, just tap the button below.
- Send in details about your central heating system
- Check ratings from previous recent customers
- No call out fees
How Long Does This Project Take?
When sourcing prices, we asked our chosen firms how long they thought it would take to power flush our central heating system.
Obviously, the time it takes will depend on how many radiators there are and how clogged the system is, no two houses are the same.
We were told that for a typical three-bed house, it would take anything from 5 to 7 hours.
Frequently Asked Questions
We sourced the following answers from the information packs given to us and from the websites of several of the firms we contacted.
Q: Will the radiators need to be removed?
A: In some cases, compacted sludge can only be removed by removing the rads and manually cleaning them with a powered pressure washer/hose but most of the radiators shouldn’t need to be removed.
Q: Instead of having the system flushed can I not just install a magnetic filter?
A: Sludge and rust trapped inside the radiators will not circulate with the water, so won’t be captured by a magnetic filter. These filters work well as a preventative solution but won’t remove any existing sludge.
Q: I have had my rads repeatedly flushed, but they keep blocking up with sludge, why is this?
A: This might be because your heating system is allowing air into the pipework, this will accelerate the corrosion of the pipes and radiators. We suggest you have your heating system checked by a qualified engineer before you flush the system again.
Q: How often should I have the system power flushed
A: Firms suggest every ten years but most consumers wait much longer.
Q: Can all types of central heating systems be flushed?
A: Yes, all types of water-based central heating systems can be flushed.
Q: Are TRVs (radiator valves) an issue?
A: No, the pins can get stuck as a result of the sludge, but this is easily fixed and these valves are also easy to replace.
Q: I have received a quote for £150, is this a fair price/cost?
A: For this price, we would not expect a complete and thorough power flush, although the water may run clear after a power flush it may be because the water is flowing over compacted sludge.
Q: Should I have the central heating system drained and refilled every year?
A: No. This will only add oxygen and other impurities to the water; this will accelerate the corrosion. You’ll also need to top up the inhibitor which will just add to the cost.
Q: What is the sludge made from?
A: It is mostly rust that corrodes from the metal pipes and radiators, but also contains contaminants and scale from the water.
Compare Quotes For Your Power Flushing Project Today
As with any home improvement project, we always recommend getting at least three quotes for comparison.
With that in mind, we recently teamed up with Rated People.
They can supply you with up to three written quotes from local tradespeople, you can read reviews created by recent customers and take your time making a decision.
Tap the button below and fill out the form. Rated People is a free and popular service:
- Fill out the form
- Get your quotes in a timely manner
- Compare ratings and reviews created by past customers
- Leave your own feedback and rating when the power flushing job is complete