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Central Heating System Cleansing Certificate

A Central Heating System Cleansing Certificate confirms that a central heating system has been flushed, cleaned, and treated in accordance with BS 7593:2019. It is required by all major boiler manufacturers to validate the warranty when a new boiler is installed. The certificate records flushing method, water quality readings (TDS and pH before and after), magnetic filter installation, and inhibitor treatment.

BS 7593:2019, Building Regulations Part L, Benchmark SchemeValid: One-off (per flush)

What it covers

  • System details (boiler, radiators, system type)
  • Flushing method and chemicals used
  • Water quality before and after (TDS, pH, visual appearance)
  • Magnetic filter installation (mandatory under BS 7593:2019)
  • Corrosion inhibitor product and dosage
  • Post-flush system checks and pressure readings

Who needs a Powerflush Certificate?

Homeowners having a new boiler installed
Landlords
Anyone commissioning a heating system flush

Create your Powerflush Certificate with CertBox

1

Fill in the form

Pick Powerflush Certificate from the list, fill in the fields on your phone.

2

Compliance checks run

Built-in validation catches missing fields and out-of-range readings.

3

PDF generated instantly

Professional PDF ready to share via secure link or download.

Frequently asked questions about Powerflush Certificate

Do I need a powerflush when installing a new boiler?
Yes. BS 7593:2019 requires system cleansing before commissioning a new boiler. All major manufacturers (Worcester, Vaillant, Baxi, Ideal) require it for warranty validation. Without the certificate, the warranty may be void.
Is a magnetic filter mandatory?
Yes, under BS 7593:2019 a permanent in-line magnetic filter must be installed on all central heating systems. This is checked by the compliance checklist in CertBox and flagged as a warning if missing.
What TDS reading is acceptable after a powerflush?
Industry best practice is below 500 ppm. Readings above 1000 ppm indicate the system needs further flushing before commissioning. CertBox warns you if the reading is too high.

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