How Much Does it Cost to Power Flush a Central Heating System?

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You don’t need to know a lot about central heating systems and radiators to know that they generally work very well without any intervention. However, you may eventually notice certain parts of your radiators are staying cool even when the heating is on. You may also notice the radiators are a little noisier than they used to be, which is noticeable and becomes annoying rather quickly. These are both signs that the central heating system isn’t working as well as it could be and that power flushing is necessary. Luckily, we are here to help. At Grand Union Plumbing & Heating we offer power flushing at a competitive cost. When your central heating system needs a power flush, you don’t need to worry about breaking the bank.

What Does Power Flushing a Central Heating System Do?

Over time, iron oxide (which you may know to be sludge) can build up in radiators. This is what causes cold patches and additional noise, both of which you will want to fix. By power flushing the central heating system, this iron oxide is removed and any additional debris is flushed out. In return, you will be left with quiet radiators that work well. It’s important to have a central heating system that’s efficient and long lasting, which is why power flushing is important. When your central heating system is working well you’re likely to spend less on heating bills, as will be getting the most out of its performance.

There are a few different ways to power flush a central heating system and some companies choose to use high pressure water. However, this can cause leaks and damage. We do something a little different and operate at the same pressure as the central heating system, which reduces the chances of any damage being done. Our power flushing techniques will collect dirt, debris and iron oxide from the system and flush it out without putting your central heating system at risk.

Power Flushing Cost

At Grand Union Plumbing & Heating, we offer power flushing for a flat rate of £350 + VAT. This includes power flushing up to 12 radiators. There’s no need to worry about being charged over the odds, as we take pride in keeping our prices competitive. Remember, we are a team you can trust. For just £350 + VAT, your entire central heating system can undergo power flushing.

If you have noticed your radiators are not warming up as they once did and your central heating system isn’t working too well, contact us to find out more about power flushing. We offer a professional, efficient and experienced power flushing service. Get in touch with Grand Union Plumbing & Heating today.

Any questions?

If you are looking for a heating engineer within the Milton Keynes area for anything from boiler installations to fixing a tap, or would like some friendly advice please call Mitch directly today on 01908 034194

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Areas we cover

  • Aylesbury
  • Bedford
  • Leighton Buzzard
  • Northampton
  • Olney
  • Towcester
  • Woburn Sands
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What Our Customers Say

It’s not very often that you find a quality tradesperson who is reliable, honest, and competitive on his pricing. Mitch has done a number of jobs in our house, including installing a new boiler, water tank and radiators. All to a brilliant standard. I will happily recommend Mitch and Grand Union Plumbing!


Very happy with the service I have received, the service was prompt, efficient and professional. Yes, I would use again.

Clare Price

Amazing work and attention to detail and Mitch is a great person to work with

Made in Sud Pizzeria

Very friendly service. On-time and very professional. Also very careful about safety during the current COVID outbreak.

Andrew Robinson

Mitch is super friendly and professional, happy to give advice and he’s done loads of work for me.

G Man

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Mandi Willett

Highly recommend Mitch. Polite, professional, on time. Great service.

Susan B

Mitch replaced our boiler and ran new pipework, plus relocated some radiators. He did a brilliant job and I wouldn’t hesitate to recommend him! He was punctual, helpful and polite.

Suzanne Simmons

I had a new bathroom fitted by Mitch. He was absolutely excellent. He was polite, tidy and did an exceptional job. Reasonably priced too. 100% recommend.


Excellent service. I contacted them for a boiler repair. They responded within hours with prices. Once they confirmed part availability, they fitted within days.  Very efficient, great service and I liked their clear pricing.

Definitely recommend & I will be booking my annual service with them in future.

Well done!

Sheena Mac

Grand Union replaced our central heating system and in doing so we requested that it be relocated from the airing cupboard into the Garage.  The work was completed professionally & on time with the relocated pipework like a work of art, very neat and orderly.  I would have no issue with recommending Grand Union, and will certainly be using them for all our gas & plumbing needs.


I have called Mitch out twice since moving into our new house a month ago. Both times he has managed to fit in an appointment fairly quickly to resolve our issues. He has been professional and friendly, offering advice on other issues that I have seen. I would definitely recommend his services.

Simon Edwards

We have used Grand Union Plumbing several times as we had a really tricky fault. We found Mitch to be really excellent. Very happy to recommend, 10/10

Annette McDade

Called Mitch out on very short notice, extremely reliable and great rates, would highly recommend Grand Union Plumbing and Heating. Also provided advice with other queries aside from the job at hand- with no reluctance. Great service, thank you for your hard work and honesty Mitch.

Dushan Gnanakumar
Great service, polite, attention to detail. Would highly recommend.
Ajvinder Dhatt
Had a leak that needed fixing asap and Mitch gave me advice over the phone to deal with it until he could get to me, then came out within the hour on a weekend! Would highly recommend
Hannah Manners
Great company would highly recommend for any heating & plumbing issues
Terry Adolpho

Definitely recommend these guys. Had a job done by them and they wasted no time to get it done and made sure I was completely happy before any payments. Nowadays companies just want to rush and take your money. Big thumps up

Tevaugh Grant
We always use Grand Union for serving and any other unforseen problems. The service and professionalism is 1st class. Would definitely recommend!!
Stephanie Horne
A great company to do business with… I used them recently for an emergency with a domestic heating system which was rectified very efficiently. A second problem (some months later) and there was no decision to make, called them and they sorted it in no time with minimum fuss, mess and very reasonably priced.
Trevor Gordon

Have used Grand Union twice now. They are very quick to respond to enquiries, reasonably priced, tidy workers and very friendly. I can’t fault them. Definitely my go to guys now for any plumbing needs.
Highly recommended

Emma Verrall
Great service from Mitch. Have used a few times for boiler service, repairs and outdoor tap installation. Always very prompt service, turns up on time and reasonable prices. Would definitely recommend!
Jon Hood

I found Grand Union Plumbing through the Gas Safe Register. I had a boiler service and gas safety certificate. Mitchell was very professional and the prices were very reasonable. I would definitely recommend and use again.

Rebecca Hughes
Mitch was very helpful when fitting my new boiler – he was very fair about price and I couldn’t recommend Mitch enough. Thanks Mitch!
Reece Hussain


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