Launch offer — valid today only

📄 Digital book in PDF · read it on your phone or print it

Water Regs and G3 Unvented in Drawings Every Valve and Pipe Run on Its Own Page, So It Still Makes Sense the Next Morning

For the City & Guilds 3345 water regs and G3 unvented courses and the LCL Awards equivalents. Fluid categories, backflow devices, tap gaps, the cold inlet group, expansion vessels, relief valves, D1 and D2 discharge pipes and commissioning: one topic per page, the drawing first, then what you need to remember. 64 illustrated pages.

GET WATER REGS & G3 ILLUSTRATED

🔒 Secure checkout · PDF by email · 30-day guarantee

Every topic, its own pageEvery fitting and valve drawn, with the explanation beside it
64 illustrated pages8 parts, from how the rules fit together to exam and on-site review
Up-to-date sourcesWater Fittings Regulations 1999 and Approved Document G (2015, amended 2016)
PDF by emailFormat

Look Inside the Book

Every page has one big drawing and a box with the numbers and rules you need to know:

Hose reaching WC or bidet = Cat 5 · restrained handset: 25 mm commonly specified
Hose reaching WC or bidet = Cat 5 · restrained handset: 25 mm commonly specified
Strainer, PRV, check valve, expansion relief: the cold inlet in flow order.
Strainer, PRV, check valve, expansion relief: the cold inlet in flow order.
D2: 300 mm vertical drop, then at least 1 in 200 continuous fall.
D2: 300 mm vertical drop, then at least 1 in 200 continuous fall.
High level: metal hopper and downpipe, or roof 3 m from plastic gutters.
High level: metal hopper and downpipe, or roof 3 m from plastic gutters.
Discharge must be visible at the tundish; soil stack only under AD G conditions.
Discharge must be visible at the tundish; soil stack only under AD G conditions.
Benchmark checklist, installer label by the cylinder, manual left behind, tundish explained to the user
Benchmark checklist, installer label by the cylinder, manual left behind, tundish explained to the user
750–1350 mm, 230 L, 12 L/min, 15 L, 48 °C, 60 °C, 90 °C, 100 °C, 600 mm, 300 mm, 1 in 200, 100 mm, 3 m
750–1350 mm, 230 L, 12 L/min, 15 L, 48 °C, 60 °C, 90 °C, 100 °C, 600 mm, 300 mm, 1 in 200, 100 mm, 3 m
Inlet group, expansion, 3 protections, D1, tundish, D2, termination, commissioning, notification
Inlet group, expansion, 3 protections, D1, tundish, D2, termination, commissioning, notification

Swipe to see more →

These are real pages from the book. The table of contents is the full one: 8 parts and 60 topics.

The Problem Isn't You. It's How It Was Explained.

You're standing next to a new unvented cylinder. The relief valve is on and the discharge has to go outside. Where does the tundish go, and how far can the pipe run?

You've seen it done a hundred times. But G3 gives it to you as clauses, paragraphs and a sizing table. Read at night after a full day on site, it becomes one long sentence with no route in it.

D2: 300 mm vertical drop, then at least 1 in 200 continuous fall.

In the book, that discharge is a single drawing: relief valve, D1, tundish, D2, termination, left to right, with one check at each stage.

Fluid categories, the cold inlet group, the RPZ valve, tap gaps and commissioning work the same way. Each one has its own page.

You see the route, you understand it, and you run the pipe without digging the Approved Document out of the van.

COMPARE FOR YOURSELF

The Same Topic, Two Ways to Study It

THIS
  • The manual: line after line
  • Inlet valves explained only in words
  • Four valves in one sentence, with no order you can picture
The cold water supply to an unvented hot water storage vessel shall be provided with a combination of devices, commonly supplied as a factory-fitted or loose inlet control group, comprising a line strainer to protect downstream components from debris, a pressure reducing valve set to the manufacturer's stated operating pressure, a single check valve to prevent the reverse flow of heated water into the supply pipework, and an expansion relief valve which shall discharge, via a suitable tundish, should the pressure within the vessel exceed its rated value.
FOR THIS
  • The cold inlet group in one drawing
  • Strainer → PRV → check valve → expansion relief, in flow order
  • You can say the order without looking at the cylinder
Strainer, PRV, check valve, expansion relief: the cold inlet in flow order.
CONTENTS

Take a Look at the 8 Parts and 60 Topics

How the rules fit together, fluid categories, backflow devices, cold and hot supply, the unvented cylinder, discharge pipes D1 and D2, commissioning and certification, and exam review: 64 pages, all illustrated.

IHow the rules fit together · pp. 5-10
  1. Two rulebooks, one installation
  2. England, Wales, Scotland and Northern Ireland
  3. How the Water Regs are laid out
  4. Suitable materials and fittings
  5. Advance notification: what needs it
  6. The 4-step routine used in this book
IIFluid categories 1 to 5 · pp. 11-17
  1. The five categories on one ladder
  2. Category 1 and 2: wholesome water
  3. Category 3: slight health hazard
  4. Category 4: significant health hazard
  5. Category 5: serious health hazard
  6. House or not a house: why it changes the category
  7. Reading a fluid category question
IIIBackflow devices drawn in place · pp. 18-26
  1. Back pressure and back siphonage
  2. Air gaps: AA, AB, AG
  3. Tap gaps: AUK2 and AUK3
  4. Single and double check valves: EA, EB, EC, ED
  5. The RPZ valve: type BA
  6. Pipe interrupters and the type DC
  7. Disconnector CA and the sealed heating filling loop
  8. Hose union taps and the outside tap
  9. Shower hoses and the 25 mm rule
IVCold and hot supply rules · pp. 27-34
  1. From the main to the stop valve
  2. Stop valves for flats and multiple occupancy
  3. Contaminated ground and barrier pipe
  4. Frost protection and concealed pipes
  5. The cold water storage cistern
  6. Cistern levels and the air gap
  7. Dead legs: maximum uninsulated hot pipe runs
  8. Hot water temperatures that matter
VThe unvented cylinder, valve by valve · pp. 35-42
  1. Vented versus unvented
  2. Why water expansion is dangerous
  3. The cold inlet group
  4. Pressure reducing valve and balanced cold
  5. Expansion vessel or internal air bubble
  6. Three levels of temperature protection
  7. The temperature and pressure relief valve
  8. Indirect and direct heating controls
VIDischarge pipes D1 and D2 · pp. 43-50
  1. The discharge route in one drawing
  2. D1 and the tundish
  3. D2: drop, fall and material
  4. The D2 sizing table
  5. Worked example: when 22 mm isn't enough
  6. Terminating at low level
  7. Terminating at high level
  8. Discharge you can see and hear
VIICommissioning, service and certification · pp. 51-57
  1. Before you fill: the pre-checks
  2. Commissioning the cylinder step by step
  3. Benchmark, labels and handover
  4. Annual service routine
  5. Notifying the work under G3
  6. Approved contractors and Water Regs certificates
  7. Testing pipework
VIIIExam and on-site review · pp. 58-64
  1. Category to device on one page
  2. Numbers to remember
  3. The 4-step routine on a full job
  4. The 4-step routine on an unvented install
  5. How to read an exam question
  6. Common Water Regs mistakes
  7. Common G3 discharge mistakes

One Page, One Topic, All Clear

Think of it like this:

You're quoting for a bathroom and the customer wants a bidet with a shower handset. Before you price it, you need the fluid category and the device.

You open the page on shower hoses and see the hose drawn reaching into the bowl: that's Category 5, and the restrained handset with its gap is drawn right beside it.

Discharge must be visible at the tundish; soil stack only under AD G conditions.

The RPZ valve, the tundish, the D2 sizing table, the expansion vessel and the commissioning steps work the same way: each one on its own page.

Water Regs & G3 Unvented Illustrated is 8 parts and 60 topics, all drawn, with a final part to review for the exam and on site.

What you see drawn, you don't have to memorize.

What's Inside Water Regs & G3 Unvented Illustrated:

Ipp. 5-10

How the rules fit together

The Water Regs and Building Regulations side by side, the rules in each UK nation, suitable fittings, advance notification and the 4-step routine: category, device, valves, discharge.

IIpp. 11-17

Fluid categories 1 to 5

The five fluid categories on one ladder, what puts water in each one and why a house changes the answer, so you can name the category before you name the device.

IIIpp. 18-26

Backflow devices drawn in place

Back pressure and back siphonage, air gaps, AUK2 and AUK3, check valves, the RPZ, the DC, the filling loop, outside taps and shower hoses, each drawn where it sits on the job.

IVpp. 27-34

Cold and hot supply rules

From the main to the stop valve, flats, contaminated ground, frost, the cistern and its levels, dead legs and the temperatures that matter.

Vpp. 35-42

The unvented cylinder, valve by valve

Vented versus unvented, expansion, the cold inlet group, the PRV, the expansion vessel, the three levels of temperature protection and the T&P valve.

VIpp. 43-50

Discharge pipes D1 and D2

The discharge route in one drawing: D1 and the tundish, D2 and the sizing table, a worked example, low and high terminations and visible discharge, so you can size a run and explain it to building control.

VIIpp. 51-57

Commissioning, service and certification

Pre-checks, commissioning step by step, Benchmark and handover, annual service, notifying the work, approved contractors and testing pipework.

VIIIpp. 58-64

Exam and on-site review

Category to device on one page, the numbers to remember, the 4-step routine on full jobs, reading exam questions and the most common mistakes.

At the end of the book: A final review part: category-to-device chart, numbers to remember and the 4-step routine on full jobs.

SHOW ME WHAT'S INSIDE

Plus: 2 Free Books

Water Regs & G3 Exam-Style Questions

BONUS 1: «Water Regs & G3 Exam-Style Questions»

Value on its own: US$ 17.90

Practise with exam-style questions on fluid categories, backflow, unvented safety devices and discharge pipes, each with the answer and the page that explains it.

The 15 Most Common Mistakes: Before & After

BONUS 2: «The 15 Most Common Mistakes: Before & After»

Value on its own: US$ 14.90

See the installation mistakes that come up most often drawn wrong and then right, so you spot them on site and in the exam.

Water Regs & G3 Unvented Illustrated with 2 Free Books

  • Water Regs & G3 Unvented Illustrated: 64 illustrated pagesUS$ 63
  • BONUS 1: Water Regs & G3 Exam-Style QuestionsUS$ 17.90
  • BONUS 2: The 15 Most Common Mistakes: Before & AfterUS$ 14.90
  • High-resolution PDF to printIncluded
Total value US$ 95.80
YOUR PRICE:
US$ 27
You save US$ 68.80
YES, I WANT WATER REGS & G3 UNVENTED ILLUSTRATED FOR US$ 27

📄 This is a digital PDF book sent to your email: nothing is printed or shipped.

Secure purchaseEncrypted payment30-day guarantee

PDF by email: We email you Water Regs & G3 Unvented Illustrated as a PDF, together with the two free books. It's a single payment: no installments, no extra charges.

Who This Book Is For

You're on the water regs course

You're on the water regs course

Every topic from the course is on its own page, drawn, so what you learn in the evening is still clear the next day.

Your water regs or unvented assessment is close

Your water regs or unvented assessment is close

Category to device, the numbers to remember and the discharge rules, each on one page, so you can go over the whole lot in the same order before the day.

You already fit unvented cylinders

You already fit unvented cylinders

The cold inlet, the relief valves and the D2 run drawn step by step, printed and kept in the van for a quick check before you sign the job off.

Everything You Get Today

US$ 95.80US$ 27
YES, I WANT WATER REGS & G3 UNVENTED ILLUSTRATED FOR US$ 27

📄 This is a digital PDF book sent to your email: nothing is printed or shipped.

30DAYS
GUARANTEE

30-Day Guarantee

Try Water Regs & G3 Unvented Illustrated for 30 days, bonus books included.

We refund everything if the file won't open, if the book isn't what you see here, if you were charged twice or if the email doesn't arrive. Just email us.

You pay once. No subscriptions.

Frequently Asked Questions

Is it for me if I've been plumbing for years and only need the water regs or G3 unvented qualification?

Yes. It follows the topics of the City & Guilds 3345 water regs and G3 unvented units and the LCL Awards equivalents, one topic per page and always in the same order: category, device, valves, discharge. It doesn't teach you how to plumb: it makes the rules you already work to clear for the exam and for signing off.

Where does the content come from?

From the Water Supply (Water Fittings) Regulations 1999 with Schedules 1 and 2 and the WRAS guidance on backflow, and from Approved Document G (2015 edition with 2016 amendments), Part G3. There are notes on the Scotland Byelaws 2014 and the Northern Ireland Regulations 2009.

Is it official material?

No. It's an independent illustrated study book. It isn't published or endorsed by City & Guilds, LCL Awards, WRAS or any government body, and it doesn't give you a qualification or a certificate: those come from passing your course assessment.

Does it replace the course?

No. It's a companion to your course and practical assessment. On the job, the current regulations and the manufacturer's instructions always apply.

Are the practice questions the ones in the exam?

No. They're exam-style questions written for this book, each with the answer and the page that explains it. They aren't official exam questions.

When and how does it arrive?

As a PDF by email, to the address you enter at checkout. The two free books come the same way.

Do I have to pay every month?

No. It's a one-off payment. There's no subscription.

Can I have it on paper?

Yes. The PDF prints well at home or at a print shop, so you can keep it in the van.

How does the refund work?

You have 30 days. We refund everything if the file won't open, if the book isn't what you see on this page, if you were charged twice or if the email doesn't arrive: just email us.

Before You Close This Page

No more rereading with nothing sticking.

The discharge route? You see it drawn, and that's it.

You walk into the exam knowing where everything is.

Drawings make studying faster.

The book is right below.

One-time payment: US$ 27 · Guarantee: 30 days · PDF by email

YES, I WANT WATER REGS & G3 UNVENTED ILLUSTRATED FOR US$ 27

📄 This is a digital PDF book sent to your email: nothing is printed or shipped.