Updated 25 September 2026
Power flush cost UK 2026
The going rate for power flush in 2026 is £350–£800 (total, ex VAT). Below: a calculator, what the job involves, materials at three price levels, and the prep that changes the price.
Market band£350–£800
Worked example, 10 radiator£611
Time on site1 days
Power flush calculator
Price a real job freeUses your rates, your speed and your receipts.
Market band source: Checkatrade.
What the job involves
| Stage | Task | Typical time |
|---|---|---|
| work | Set up, flush and fit inhibitor | 2 h |
| work | Flush each radiator | 0.4 h per radiator |
Materials at three price levels
| Material | Budget | Trade choice | Premium |
|---|---|---|---|
| Power flush chemicals set | £40 Standard cleanser — Shifts sludge | £60 Branded cleanser and neutraliser — Faster clean | £90 Heavy-duty descaler set — Badly sludged systems |
| Central heating inhibitor 1L | £10 Standard inhibitor — Stops corrosion | £15 Branded inhibitor — Keeps warranty valid | £20 Inhibitor plus leak sealer — Older systems |
Trade prices ex VAT, estimates checked 2026-09-25. Log your receipts in Grafto and your own prices replace these.
What changes the price
- Fit a magnetic filter too? no · yes
Prep to look for
| Condition | Check | Effect |
|---|---|---|
| Sludge in the system | black water from a bleed valve, radiators cold at the bottom | Power flush the system |
| Microbore pipework | 8–10 mm pipes to radiators | Microbore: limits radiator upgrades and blocks easily — flush it |
| Corroded fittings | green or white crust, rust on valves and pipes | Replace corroded valves |
Questions
How much does power flush cost in the UK in 2026?
The researched market band is £350–£800 (total, ex VAT), from Checkatrade. A worked example of 10 radiator comes to about £525–£723 across budget, trade and premium materials.
How long does power flush take?
The worked example of 10 radiator takes about 1 working days.
What changes the price of power flush?
Mainly size and access, plus any prep found on site: sludge in the system, microbore pipework, corroded fittings.