Upskilling Opportunity
Flexible Training

(G3) Unvented
Hot Water Course

LCL Assessed Course

LCL is a recognised Awarding Organisation, accredited by the United Kingdom Accreditation Service (UKAS). City and Guilds vs LCL


Hot Water Systems & Safety (inc. Unvented hot water) (HWSS)


£200 (Including VAT)

Entry Requirements

Significant experience or qualification(s) in the installation of domestic hot & cold water systems.

Delivery Methods

1 Day Centre-led Training


Start Dates


About Our (G3) Unvented Hot Water Course

Why Earn The Unvented Hot Water (G3) Qualification?

For years, the UK has met hot water demand in various ways. However, while traditional installations continue to work, there are more options in the ever-evolving industry.

Yet, renewable energy technology in the replacement market creates challenges, from the difficulties installing in existing premises and ever-changing technology to understanding and utilising realistic energy-saving options and ensuring all technology is compliant.

This G3 unvented course has been designed for plumbing and heating engineers to demonstrate understanding and competency in installing, servicing, and maintaining domestic hot water systems and cylinders.

The Microgeneration Certification Scheme (MCS) registration bodies require Hot Water Systems and Safety certification for those looking to be recognised for installing Solar Thermal Hot Water Systems.

Free Heat Pump Training New Dates Available!

Free Water Regulations and Air-Source Heat Pump Training for existing engineers Find out more.

Learn More About The Course

Unvented Hot Water Systems (G3)
Course Syllabus

  • Domestic Hot Water Systems
  • Associated Regulations
  • Practical & Written Assessment
The course syllabus is intended as a guide. Timings and delivery of course content are subject to change at the discretion of the training manager & individual course tutors.
Unvented Hot Water Training - Course Overview

Standards & Principles

Learn the ins and outs of regulations, standards, and guidelines governing unvented hot water systems. Grasp the theory behind hot water expansion and understand the fundamental principles of efficient hot water storage.

Design & Integration

Dive deep into the design considerations crucial for unvented hot water systems. Explore the components and their functions while understanding the intricate safety controls, discharge mechanisms, and seamless integration methods.

Installation & Maintenance

Master the art of installing hot water systems with precision. Gain expertise in the maintenance and servicing protocols for all hot water systems, specifically focusing on the intricacies of unvented hot water systems. Delve into crucial health and safety considerations to ensure seamless operations.

Engineer demonstrating how an unvented cylinder works to a group of students during Unvented Hot Water (G3) Training
Over the shoulder shot of students in an Unvented Hot Water theory training session
Frequently Asked Questions

Unvented Hot Water (G3) Training FAQs

Here, you can find several frequently asked questions about our Unvented Hot Water (G3) Training.

If you have any additional questions, don’t hesitate to get in touch for a free consultation with one of our specialist course advisors.

Do I Need Previous Experience To Begin Training?

To be eligible to earn your G3 qualification, you must hold the following:

  • Experience in the installation of domestic hot & cold water systems & DCLG recognised competency in a conventional fuel, e.g. gas, oil or solid fuel.

For those in the plumbing industry:

  • NVQ Level 2 qualifications or significant experience.
  • WRAS is desirable and is available separately, and candidates should be conversant with the Part G building domestic 2010.

Why Earn The Unvented Hot Water (G3) Qualification?

The unvented hot water and safety systems qualification ensure operatives know how to comply with Approved Document G (ADG) 2016 when working on hot water systems.

How Long Is Unvented Hot Water (G3) Training?

Training takes place over one day.  You will be required to be in the centre 8am-4pm.

When Do I Need To Renew My Unvented Hot Water Qualification?

As with the ACS assessment, engineers must also renew their G3 qualification every five years.

How Much Does Training Cost?

This (G3) Unvented Hot Water Course currently costs £200, including VAT.

Where Can I Complete Unvented Hot Water (G3) Trianing?

Unvented Hot Water (G3) training is available at three of the Options Skills training centres. Located in; Birmingham, Manchester, and South London.

What Career Options Are Available For A G3 Qualified Engineer?

With a G3 qualification, you can progress into the renewable energy industry, increasing your skillset and opening up more revenue streams for your business.

At Options Skills, we deliver a range of renewable energy courses, from Low-Temperature Heating Design to Heat Pump Installation and Maintenance.

How Often Do Courses Start?

We have new Unvented Hot Water (G3) courses starting regularly, so you’ll never have to wait long to begin training with Options Skills.

How Do I Enrol?

To find out more and enrol on our Unvented Hot Water (G3) training, you can request a call via our contact form or call us directly on 0800 802 1306. 

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