Power Flush London
Central heating power flushing across all London boroughs. Remove sludge and scale, restore full efficiency, extend boiler life. Includes inhibitor treatment and magnetic filter.
From £299 - fixed price, all inclusive
0800 123 4567A power flush in London costs £300–£600 depending on system size (number of radiators). The process takes 6–8 hours and restores heating efficiency by removing sludge and debris from your system.
Power Flush Cost London - 2026 Prices
| Job Type | Typical Cost | Time |
|---|---|---|
| Power flush - up to 6 radiators | £300–£400 | 4–6 hours |
| Power flush - 7–10 radiators | £400–£500 | 6–8 hours |
| Power flush - 11–15 radiators | £500–£600 | 8–10 hours |
| Power flush + inhibitor dose | £350–£650 | 6–10 hours |
| Magnetic filter installation | £150–£250 | 1–2 hours |
| System flush without power flush | £150–£250 | 2–3 hours |
* Prices are estimates for London. Fixed price confirmed before work begins. £60 call-out fee.
Signs Your System Needs a Power Flush
- Radiators cold in patches or slow to heat
- Boiler making banging or kettling noises
- Frequent boiler breakdowns
- Heating system slow to reach temperature
- Dark or discoloured water when bleeding radiators
- High energy bills despite adequate boiler size
- Some radiators won't heat at all
- Central heating pump failing regularly
Diagnostic Check
We test flow rates and temperature differentials across radiators to confirm sludge is the cause of the problem.
Power Flushing
High-velocity water with professional chemicals flushes through every radiator and circuit, removing all debris.
Inhibitor & Filter
We refill with clean water and Fernox or Sentinel inhibitor, then fit a magnetic filter to protect the system going forward.
New Boiler Installation?
If you are having a new boiler fitted to an existing system, most manufacturers (Worcester Bosch, Vaillant, Baxi) require a power flush as a condition of the warranty. We can power flush before or on the same day as a new boiler installation.