ERS Unvented Domestic Hot Water Storage Systems (UDHWSS)

This is a stand alone training and assessment course which concentrates on the safety of installing and maintaining Unvented Hot Water Storage Systems. It is suitable for plumbing and trade operatives undertaking the course for the first time or for those renewing their expiring qualifications.



Course Content

The course will instruct candidates to the level of competence needed to carry out safe installations of domestic unvented systems in domestic premises, looking at types of installations, controls and pipe work systems. The course covers all unvented systems from 15 to 500 litres in capacity.

Entry Requirements

For those candidates who install and maintain unvented hot water systems a plumbing qualification is preferable, but not essential.

Course Duration & Qualification

1 day (8.15am to 4.00pm, usually held on a Wednesday)

Qualification: ERS UDHWSS Certificate in Unvented Hot Water Systems.


There are three parts to the initial assessment:

  • Multiple choice theory examination
  • Control descriptors and theoretical fault diagnosis
  • Practical assessment on commissioning and maintaining unvented domestic hot water storage systems.

Additional Information

We can offer a half day (afternoon 1.00pm to 4.00pm) re-assessment only package for £125 (payable in advance)

There are only two parts to the re-assessment:

  • Multiple choice theory examination
  • Control descriptors and theoretical fault diagnosis

Candidates are required to provide their previously awarded unvented certificates to sit re-assessments only, as well as 2 passport photographs and National Insurance Number.


Start Dates:

Please e-mail for start dates.

To book or for further information, please call 020 8544 4501/4574 or email This email address is being protected from spambots. You need JavaScript enabled to view it.

Tuition Fee: £250 (payable in advance of course)

Please note that course fees are accurate at time of publication but may be subject to change.

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