Clear, honest pricing
Power Flush Cost London
What a power flush costs in London depends on your system. Here’s exactly what affects the price — and how to get an accurate, fixed quote with no surprises on the day.
How much does a power flush cost?
There isn’t one fixed price for a power flush, and you should be wary of anyone who quotes a single figure without knowing anything about your heating. A thorough power flush is labour-intensive: every radiator is flushed on its own, and the time that takes depends on the size and condition of the system.
What we can do is explain the factors that affect the price, and give you a clear, fixed quote once we understand your system.
What affects the price of a power flush
1. Number of radiators
This is the biggest factor. Each radiator is isolated, flushed with flow reversal and agitated individually, so a four-bedroom house with fourteen radiators takes considerably longer than a two-bedroom flat with six. It’s why many people search for power flush cost per radiator.
2. How contaminated the system is
A system with light discolouration clears quickly. One that produces thick black sludge, with several radiators cold across the bottom, needs longer circulation with chemicals, more agitation and more flushing to waste.
3. System condition
Seized or weeping radiator valves, corroded radiators and old pipework can all need attention before or during a flush. We’ll point these out beforehand.
4. Type of heating system
Sealed systems with combi or system boilers, and open-vented systems with a tank in the loft, are connected and flushed differently. Microbore pipework and unusual layouts can add time.
5. Accessibility
Where the boiler and pump are, how easy it is to reach a drain for the dirty water, radiators boxed in or behind fitted furniture, parking and building access in flats — all of these affect time on site.
6. Additional remedial work
Sometimes a flush reveals other issues: a failing pump, a leaking valve, a radiator that’s too corroded to save. We never carry out extra work without agreeing it with you first.
Our pricing guide
Use this as a guide to how we price. Your final quote will be confirmed once we know about your system.
| Property / system size | Guide price |
|---|---|
| Flat or small house (up to 6 radiators) | Quote after survey |
| Medium house (7–10 radiators) | Quote after survey |
| Larger house (11–15 radiators) | Quote after survey |
| 16+ radiators or commercial | Quote after survey |
| Optional extras | Guide price |
|---|---|
| Magnetic system filter (supplied & fitted) | Quoted separately |
| Inhibitor dosing and test | Quoted separately |
| Replacement radiator valves (per pair) | Quoted separately |
Prices include VAT where applicable. Final price confirmed after we have seen the system.
Add your guide prices in site.config.js → pricing, or leave as “Quote after survey”What’s included in our power flush
- System check and water test before we start
- Professional sludge remover (and descaler where needed)
- Every radiator flushed individually, with flow reversal and agitation
- Flushing to waste until the water runs clear
- Inhibitor added at the correct concentration
- Boiler and radiators recommissioned and checked for even heat
- Clear explanation of what we found and any recommendations
Is a power flush worth the cost?
If your system is genuinely contaminated, usually yes. A flush can restore heat to cold radiators, reduce strain on the pump and boiler, and help the boiler run as designed. If you’re replacing your boiler, cleaning the system also helps protect your investment — see power flushing before a new boiler.
If your system isn’t badly contaminated, a flush may not be worth it — and we’ll tell you. Our guide do I need a power flush? will help you decide.
How to get an accurate quote
The quickest way is to send us:
- Your postcode
- How many radiators you have (including towel rails)
- Your boiler make and model, and whether you have a hot water cylinder
- What’s wrong — cold radiators, black water, noise, or a new boiler being fitted
- A photo of the boiler and any problem radiators, if you can
You can do that on our quote form, or send it by WhatsApp.
Power flush cost questions
Why won’t you give a price without knowing more?
Because two homes with the same number of radiators can need very different amounts of work. A fair price depends on the system’s condition and layout. A few details — radiator count, boiler type, the symptoms and ideally a photo — let us give an accurate quote rather than a guess that changes on the day.
Is power flush cost per radiator a good guide?
Radiator count is the biggest single factor, because each radiator is flushed individually and takes time. But the per-radiator figure isn’t the whole story: a heavily sludged system, stuck valves or difficult access all add time.
What about cheap power flush offers?
Be cautious with very low prices. A quick flush that just circulates chemical through the main circuit for an hour or two, without isolating each radiator, often leaves the worst-blocked radiators untouched. Ask how each radiator will be flushed and how the result is checked.
Is a magnetic filter included?
A filter is a separate item, and we will always tell you its price in the quote. It’s recommended after a flush, but it’s your choice. See magnetic filters.
Do you charge for the survey?
We’ll confirm how we handle surveys when you enquire. For many straightforward jobs we can quote from the information and photos you send.
Get a clear power flush price
Send us a few details about your heating and we’ll come back with a fixed quote — no hidden extras.