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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)

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Sample Powerflush Certificate certificate

Sample Central Heating System Cleansing Certificate certificate created with CertBox, showing the professional PDF layout with system details (boiler, radiators, system type), flushing method and chemicals used, water quality before and after (tds, ph, visual appearance)

Sample Powerflush Certificate with fictional data. All personal details shown are fake.

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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