Unvented Hot Water (G3) | Options Skills
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Unvented Hot Water

Our Unvented Hot Water (G3) course allows you to extend your scope of knowledge and understanding of heating and hot water systems.

You’ll gain a working understanding of safely heating and storing hot water, giving you a solid grounding for progression in the industry to newer technologies such as heat pump installation and maintenance. Ultimately, completing our Unvented Hot Water course will ensure you know how to comply with Approved Document G (ADG) 2016 when working on hot water systems.

Unvented Hot Water (G3) is a one day course for experienced plumbers and heating engineers.


inc. vat



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 training program has been designed for plumbing and heating engineers to demonstrate understanding and competency in installing, servicing, and maintaining domestic hot water systems. 

This Unvented Hot Water (G3) is £200, including VAT.

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.

Tutor delivering unvented hot water training in a classroom setting

Standards &

Regulations, standards and guidelines.

Theory of understanding of the expansion of hot water.

Principles of hot water storage.


Design &

Design considerations.

Components and function.

Safety controls, discharge and integration


Installation &

Installation of hot water systems.

Maintenance and servicing of HW systems, including Unvented hot water systems.

Health & safety Considerations


  • 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.


When you enrol on our ACS Domestic Gas & Plumbing Maintenance Training Course, you’ll be eligible to apply for twelve months of free Checkatrade membership. 

Checkatrade is the leading tradesperson directory, with over 13 million people using them to help find a reputable tradesperson.

Allowing you to reach new customers in your local area and further afield, Checkatrade and Options Skills will help you launch your career and grow your business.

Options Skills and Checkatrade banner for 12 months free membership when enrolled on the domestic gas training or domestic plumber training course
Engineer updating settings during unvented hot water training
Engineer checking copper piping during unvented hot water training
Engineer demonstrating controls during unvented hot water training


Options Skills
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Amy KeayAmy Keay
17:49 14 Jan 22
Option Skills - BirminghamI’m not usually a person who will write feedback on Google, but I am someone who will give credit where credit is due.I found myself in a position where I had been made redundant, and id had a conversation with someone who’d decided to go on a gas course and do this through Option Skills. After speaking with the individual, I decided that id give this a go myself to give myself a trade.I can honestly say that it is better than anything that id ever expected. Iv always been someone who had worked in finance, so doing this was new to me and I was a bit apprehensive with how it would go.I have nothing but praise to the employees at Option Skills, and I feel that they are a credit to the company.Andrew, Leanne and Shaun have been the people taking the training sessions, and what incredible people they are.They are extremely knowledgeable and helpful in every way possible with an extra desire to wanting to see you achieve.I have done the course for 8 weeks, and the knowledge I have picked up already is immense.If you are someone looking to get into the gas trade, I would highly recommend Option Skills as you will not be disappointed.Carl Evans
Samuel LauSamuel Lau
19:46 05 Jan 22
Although this course is intense and you will find yourself picking up a lot of information in a short space of time, Options Skills are the best way to get into the trades if you are a fast learner and are willing to work hard. The trainers are excellent (John, Steve, Thomas) and they will help you wherever they can, however be prepared to put in the work yourself in the evenings and weekends to revise and pass exams. Josh and James from the recruitment team were a joy to work with, they work tirelessly to find us all placements to start working in the industry while you complete the portfolio part of the course. I just finished the Electrical 6 week course and the lads found me a job in Birmingham city centre. With a number of exams left to do and portfolio to complete after you finish the 6 weeks in-centre, you can expect the total time to reach being qualified to be around 1-2 years.
beau clarkebeau clarke
08:12 24 Nov 21
Really recommend this training centre. Just finished a 6 week electrical installation course. Tutors Colin and John were great, they were knowledgeable professional and very supportive throughout. Josh and his recruitment team managed to find me a job in the industry starting the Monday after I finished the training. 5 stars all round from me. Thank you to everybody at option skills and keep up the good work!!!
Tom McdonaldTom Mcdonald
17:52 03 Nov 21
Great service from start to finish. Course is very well run & enjoyable. Prepares you for the world of electrics, with constant support from trainers Colin or John when needed. After the course is finished Josh and his team work around the clock to help you get a foot in the door at an electrical company. Constant support & updates, giving you confidence in what can be a hard process. Making it very smooth and simple
Kiril IvanovKiril Ivanov
07:37 14 Oct 21
John, I would like to express how much I enjoyed your classes. Thank you for making your classes special and interesting and enjoying with your innovative teaching.Thank you, for all the fun activities you included in the class to enhance learning, proving the fact that learning can indeed be fun.Great Teachers never try to be the best teachers. They simply bring out the best in their students. You definitely are one and I want you to know this. Thank you for everything.


Frequently asked questions about our Unvented Hot Water (G3) 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.

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

Training takes place over one day.  

You will be required to be in the centre 8am-4pm.

Engineers must renew their G3 qualification every five years.

The cost of our unvented hot water course is £200

For more information on payment options, please speak to our course advisors on 0800 802 1306.

Training is available at each one of our training centres.

With a G3 qualification, you are eligible to 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.

We are trading standards approved training provider, meaning we have been audited by trading standards and meet their criteria.

We have over 1000 5-star views from past students across our training centres.

Established nearly ten years, we have four training centres across the UK.

We put a significant focus on practical, hands-on learning.

We keep class sizes small to ensure focused learning and plenty of individual tutor time for students.

We offer two free exam resits when necessary, deliver refresher training and provide ongoing support to all our students.

We boast our own purpose-built online learning platform to support students in their training.

Our in-house recruitment team assist students in finding employment upon completing their training.

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

To find out more and enrol on our Unvented Hot Water course, you can request a call back via our contact form or call us directly on [PhoneNumber].