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Central Heating System Design Flashcards

6 cards from real CENWAT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. What is a sealed (pressurised) central heating system?

    Answer: A system that is sealed from the atmosphere with no open feed and expansion cistern

    A sealed system is pressurised and has no open vent pipe or feed and expansion cistern; instead it uses a sealed expansion vessel and is filled via a filling loop.

  2. What is the maximum pressure at which a standard domestic pressure relief valve (PRV) on a sealed heating system is typically set?

    Answer: 3 bar

    Domestic sealed heating system PRVs are typically set to 3 bar, protecting the system from over-pressurisation while allowing normal operating pressures of 1–2.5 bar.

  3. Why is it important to flush a new central heating system before commissioning the boiler?

    Answer: To remove flux, swarf, jointing compound and other debris that could damage the boiler

    Flushing removes installation debris such as flux residues, copper swarf and jointing compound which could block the heat exchanger, damage the pump or cause premature failure.

  4. What information must be provided to the homeowner upon completion of a central heating installation?

    Answer: Benchmark commissioning checklist, user instructions and Building Regulations compliance certificate

    The installer must complete the Benchmark commissioning checklist, provide user instructions for all controls, and issue a Building Regulations compliance certificate (or notify the local authority).

  5. Which organisation maintains the Gas Safe Register in Great Britain?

    Answer: Capita plc on behalf of the HSE

    Capita plc administers the Gas Safe Register on behalf of the Health and Safety Executive (HSE). All gas engineers must be registered to legally work on gas appliances.

  6. What is the purpose of the Benchmark scheme in the UK heating industry?

    Answer: To provide a standardised commissioning and servicing record for heating appliances

    The Benchmark scheme provides a standardised logbook for recording commissioning data, annual service records, and compliance information for heating and hot water appliances.

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Sources & references

Exam facts on this page (fees, format, dates, passing scores) are checked against these official sources; the date is our last check. Editorial policy

  1. euskills.co.uk — Eligibility, test delivery, exam information · verified Oct 2026
  2. gassaferegister.co.uk — Renewal, score validity · verified Oct 2026