Course Information
The Domestic Unvented Hot Water, commonly known as the G3 course, is designed for plumbers, heating engineers, gas engineers and building services professionals who install, maintain or commission unvented hot water storage systems. Delivered from our practical training centre in Telford, this one-day course helps engineers understand the safety requirements, installation standards and regulatory responsibilities linked to unvented hot water cylinders.
Unvented hot water systems are common in modern domestic properties, especially where high-pressure hot water is required throughout the home. Because these systems store water under pressure, correct design, installation, safety controls and discharge arrangements are essential. This course gives installers the knowledge required to work safely and competently on domestic unvented hot water systems.
The G3 qualification is particularly useful for engineers working in plumbing, heating, gas, renewables and property maintenance. It is also a strong add-on qualification for those installing heat pumps, cylinders, bathrooms, heating systems or domestic hot water upgrades.
Course Structure
The course is delivered over one day and combines classroom learning with assessment. Learners will cover the key requirements of unvented hot water systems, including system design, components, safety devices, discharge pipework, installation requirements, commissioning, maintenance and fault identification.
The day is structured to give experienced tradespeople a focused and practical understanding of G3 requirements, while preparing them for the end-of-course assessment.
1 day
Who Should Attend
This course is suitable for:
- Plumbers installing or maintaining domestic hot water systems.
- Heating engineers working with cylinders and hot water storage.
- Gas engineers who want to expand their domestic heating qualifications.
- Renewable installers working with heat pumps and cylinder upgrades.
- Property maintenance engineers responsible for hot water systems.
- Bathroom installers who work with pressurised hot water systems.
- Employers wanting to upskill plumbing, heating or maintenance staff.
- Existing tradespeople who need G3 certification for site or contract requirements.
Learners attend Teach A Trade from Telford, Shrewsbury, Wolverhampton, Walsall, Dudley, Birmingham, Stafford and across Shropshire and the wider West Midlands.
What the Course Covers
The course covers the key knowledge required to work safely with domestic unvented hot water systems, including:
- The principles of unvented hot water storage.
- Key requirements of Building Regulations Approved Document G.
- System types and design considerations.
- Hot water storage cylinder components.
- Expansion vessels and expansion control.
- Temperature and pressure relief valves.
- Safety controls and protection devices.
- Discharge pipework requirements.
- Installation requirements and good practice.
- Commissioning checks.
- Servicing and maintenance.
- Common faults and safety concerns.
- Installer responsibilities and certification requirements.
Typical System Areas
- Unvented hot water cylinders.
- Safety valves and controls.
- Expansion control devices.
- Discharge pipework.
- Secondary circulation.
- Heat source integration.
- Domestic hot water system compliance.
Entry Requirements
This course is aimed at existing tradespeople with a plumbing, heating, gas, building services or property maintenance background. Learners should already have practical experience of pipework, fittings, domestic hot water systems or heating systems before attending.
Before booking, learners should ideally have experience or qualifications in one or more of the following areas:
- Plumbing installation or maintenance.
- Domestic heating systems.
- Gas engineering.
- Heat pump or renewable heating installation.
- Property maintenance.
- Bathroom installation.
- Building services or mechanical services work.
If you are new to plumbing or have limited practical experience, speak to Teach A Trade before booking. We can advise whether this course is suitable or whether an introductory plumbing course would be a better starting point.
Pre Requisites
There are no formal academic prerequisites for the G3 course, but learners should be competent tradespeople with existing knowledge of plumbing or heating systems. The course is not designed as a beginner plumbing course.
Learners should be confident reading basic technical information and applying installation requirements to real-world domestic hot water systems. Prior experience with copper pipework, cylinders, valves, safety controls or heating system components will be beneficial.
The course is particularly suitable for engineers who need to demonstrate competence for unvented hot water work, employer requirements, insurance purposes, manufacturer requirements or site compliance.
Renewal
5 years
G3 unvented hot water certification is commonly renewed every five years to keep installer knowledge current and maintain evidence of competence.
Assessment
Assessment is completed during the course and may include:
- Multiple-choice knowledge assessment.
- Short written questions.
- Scenario-based questions.
- Identification of safety components.
- Understanding of discharge pipework requirements.
- Knowledge of installation, commissioning and maintenance requirements.
- Tutor-led review of key G3 safety principles.
The assessment is designed to confirm that learners understand how unvented hot water systems operate, what safety controls are required, and how to apply the relevant regulations when installing, maintaining or commissioning systems.
Learners should bring:
- Photo ID.
- National Insurance number, if required for registration.
- Any relevant trade certificates.
- Notepad and pen.
- Calculator, if preferred.
- Suitable clothing for a practical training environment.
The course is delivered in a focused one-day format, so learners should arrive prepared to complete both the training and assessment on the same day.
Course Fees & What’s Included
The Domestic Unvented Hot Water G3 course is £199 +VAT. This includes one day of training, assessment and certification.
This course is a cost-effective way for existing plumbers, heating engineers, gas engineers and maintenance professionals to add an important domestic hot water qualification to their skill set.
What’s included bullets:
- One-day G3 unvented hot water training.
- Tutor-led classroom delivery.
- Assessment preparation.
- End-of-course assessment.
- Certification.
- Guidance on applying the qualification in plumbing, heating and renewables work.
- Access to Teach A Trade’s practical training environment.
This course is often booked alongside Water Regulations, plumbing training, heat pump training or heating-related CPD. Employers booking multiple learners can contact us to discuss group availability.
£199 +VAT
1-day Domestic Unvented Hot Water G3 course
Ideal for plumbers, heating engineers and maintenance professionals
G3 Unvented Hot Water Training in Telford, Shropshire & the West Midlands
Teach A Trade delivers Domestic Unvented Hot Water G3 training from our training centre on Halesfield 23 in Telford, Shropshire. The centre is close to the M54, making it easy to reach from Shrewsbury, Wolverhampton, Walsall, Dudley, Birmingham, Stafford, Bridgnorth, Whitchurch, Oswestry and the wider West Midlands.
For plumbing and heating engineers, a local G3 course saves travel time and allows you to complete an important qualification in a single day. Whether you work for yourself, a housing provider, an M&E contractor or a plumbing and heating company, this course provides a practical route to demonstrating competence in unvented hot water systems.
Teach A Trade supports tradespeople across Shropshire and the West Midlands with short, focused qualifications that help engineers stay compliant, expand their services and take on more types of domestic installation and maintenance work.
Frequently Asked Questions
Q1: What is the G3 unvented hot water course?
The G3 course covers the installation, commissioning, servicing and safety requirements for domestic unvented hot water storage systems. It is commonly taken by plumbers, heating engineers and maintenance professionals who work with hot water cylinders.
Q2: Who needs a Domestic Unvented Hot Water qualification?
The qualification is suitable for anyone who installs, maintains, commissions or works on domestic unvented hot water systems, including plumbers, heating engineers, gas engineers, renewable installers and property maintenance engineers.
Q3: How long is the G3 course?
The Domestic Unvented Hot Water G3 course is delivered over one day.
Q4: How much does the G3 course cost?
The course is £199 +VAT. This includes training, assessment and certification.
Q5: Do I need plumbing experience before booking?
Yes, you should have relevant plumbing, heating, gas or building services experience. The course is designed for existing tradespeople, not complete beginners.
Q6: Does G3 certification expire?
G3 certification is commonly renewed every five years to keep your knowledge current and maintain evidence of competence.
Q7: Is this course useful for heat pump installers?
Yes. Many heat pump installations include hot water cylinder upgrades, so G3 is a useful qualification for renewable heating installers working with domestic hot water systems.
Q8: Where is the course delivered?
The course is delivered at Teach A Trade’s training centre in Telford, Shropshire. We regularly support learners from across Telford, Shrewsbury, Wolverhampton, Walsall, Dudley, Birmingham, Stafford and the wider West Midlands.
Q9: Can employers book a group of engineers onto the course?
Yes. Employers can contact Teach A Trade to discuss group bookings for plumbers, heating engineers, housing maintenance teams or M&E contractors.
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