Half seven on a February morning, you're stood in somebody's airing cupboard and the customer says the line everyone says: "it's got them panels on the roof, but the water's still cold." Is that system broken, or is it working exactly as designed and nobody ever explained it? This episode covers the operating principles of solar thermal hot water for Unit 314, Environmental technology systems, Phase 3 of the 9289 Plumbing and Domestic Heating apprenticeship (ST0303), Learning Outcome 2 / AC2.1.

Chris Bailey also shares some big news — The Copper Connection Podcast has been shortlisted as a finalist at the 2026 Independent Podcast Awards in the Best Children and Young Adults category.

Then it's straight into the kit: the five key components as a journey rather than a list — roof, brain, muscle, store, backup. Flat plate against evacuated tube and the exam-ready comparison. The differential temperature controller and why a pump sat still is not a pump that's failed. Glycol, freeze protection and why the manufacturer's percentage dilution decides whether the system performs. And the twin-coil cylinder detail that gets marks: lower coil solar, higher coil auxiliary.

You will learn to:

Name the five key components of a solar thermal hot water system and place them in the loop

Compare flat plate and evacuated tube collectors on cost and efficiency

Explain how a vacuum improves collector efficiency and how the heat exchanger phial and header tube work

Describe how the DTC uses collector and cylinder sensors to activate and deactivate the pump

Explain why the heat transfer fluid contains glycol and why dilution percentage affects performance

Identify which cylinder coil serves the solar system and which serves the auxiliary heat source

Explain why solar thermal in the UK is a pre-heat system needing an auxiliary heat source

Links referenced: Solar water heating (Worcester Bosch) https://www.youtube.com/watch?v=bhbOVqixsAw • Charging a closed loop solar water heating system https://www.youtube.com/watch?v=_geY-eKvBI8 • Fernox Solar S1 20 Litre dilution instructions https://fernox.com/product/solar-s1-20-litre/

Get label the components and water flow on the system diagram, and research the regulations affecting whether a solar thermal system can be installed at all — that's where we pick up next time.

solar thermal hot water, unit 314 environmental technology systems, differential temperature controller, evacuated tube vs flat plate collectors, 9289 apprenticeship ST0303 phase 3

thecopperconnectionpodcast.co.uk

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Four identical houses on one street: one on mains gas, one on LPG, one on oil and coal, one with panels on the roof and a heat pump out the back. Between them you have nearly every energy source in Unit 314 — and your job is knowing which is which, and why it matters.

This episode covers sources of renewable and non-renewable energy for Unit 314 of the 9289 Level 3 Diploma, Phase 3, Learning Outcome 1 (AC1.1–1.3). Chris Bailey sets out the two reasons we move toward renewables — emissions and depletion — then works the four non-renewable headings (oils, gases, solid fuels, and electricity generated from non-renewable sources), before tackling the distinction that catches most learners out: low-carbon producers versus zero-carbon producers. He then walks every technology one by one — solar thermal, solar PV, wind, tidal and river hydro, geothermal heat pumps, biomass and green hydrogen — and finishes by deriving all ten worksheet answers from first principles, naming the two traps that lose marks.

You will learn to:

Define non-renewable energy as finite, and renewable energy as sources that do not run out

List the four headings of non-renewable energy, including electricity from non-renewable generation

Explain why electricity is a carrier, not a source

Distinguish low-carbon producers from zero-carbon producers

Separate solar thermal (heat for hot water) from solar photovoltaic (DC converted to AC)

Explain how wind, tidal barrages, tidal stream, river and dam hydro generate electricity

Define a heat pump as moving heat from a low- to high-temperature reservoir via the refrigeration cycle

State the condition that makes hydrogen renewable — green hydrogen via electrolysis

Sort ten appliances into low-carbon and high-carbon producers

Also in this episode: The Copper Connection Podcast has been shortlisted as a finalist at the 2026 Independent Podcast Awards in the Best Children and Young Adults category.

Homework: keep your eyes open for solar thermal systems locally — hot water, not PV — and bring a picture in, because the next session builds directly on solar thermal.

renewable and non-renewable energy, unit 314 environmental technology systems, low-carbon and zero-carbon producers, solar thermal vs solar pv, 9289 level 3 diploma phase 3

thecopperconnectionpodcast.co.uk

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A macerator that keeps cycling on its own, a basin that loses its trap seal every time it's used, a WC flush that sends water bubbling up through the bath next door — these are the calls that separate a plumber who guesses from one who diagnoses.

In this episode of The Copper Connection Podcast, Chris Bailey covers Learning Outcome 4 of Unit 311 for the Level 3 Diploma in Plumbing and Domestic Heating (City & Guilds 6035 / SmartScreen Unit 311): fault diagnosis and rectification on sanitary appliances and pipework.

This episode supports AC 4.1, 4.2 and 4.3:

• AC 4.1: Methods of diagnosing sanitary appliance and pipework faults

• AC 4.2: Diagnostic checks for a range of common faults

• AC 4.3: Repair and rectification procedures for those faults

You will learn to:

• Use the three real diagnostic tools — the customer's own account, manufacturer fault-finding charts, and the governing standards (Approved Document Part H and BS EN 12058)

• Apply the seven-step process every time: diagnose, notify, isolate, decommission, rectify, re-commission, handover

• Diagnose and clear blockages the right way — trap first, mechanical clearing second, chemicals only as a last resort

• Identify and name all seven causes of trap seal loss: leak, evaporation, wavering out, self-siphonage, induced siphonage, compression and momentum

• Recognise faults caused by poor installation — drooping pipework, warped stacks with no allowance for expansion, and cross-flow between a WC and an adjacent bath

• Diagnose and rectify faults on macerators, waste lifters, sink waste-disposal units, air admittance valves and condensate pipes

• Understand why regular maintenance — and a good handover conversation — prevents most of these faults from coming back

This is the direct follow-on from the central heating fault-finding episode, moving from the heating side of the trade to the wet side — same discipline, same seven steps, different appliances.

Follow The Copper Connection Podcast for practical, exam-focused support for plumbing, heating and building-services learners.

https://thecopperconnectionpodcast.co.uk/

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Radiators warm at the top and freezing at the bottom, a boiler that ticks but never quite delivers, a drip the customer says has always been there. Where do you actually start? This episode covers fault diagnosis and rectification on central heating systems and components for Unit 311 of the Level 3 Diploma in Plumbing and Domestic Heating, Phase 3, Learning Outcome 3.

Chris Bailey covers the general inspection every older system needs before a component is touched, the three diagnostic tools — fault-finding flow charts, fault-finding grids and manufacturer instructions — and the seven-stage fault rectification process every job should follow. He then works through twenty common faults by symptom, cause and action, from pumping over and persistent venting through to motorised valve failure and pump failure, before applying it all to six worksheet-style exam scenarios.

You will learn to:

Carry out a general inspection on an older central heating system

Apply fault-finding flow charts and fault-finding grids to narrow down a fault

Use manufacturer instructions correctly before working on a boiler

Apply the seven-stage rectification process: diagnose, notify, isolate, decommission, rectify, re-commission, handover

Diagnose common central heating faults by symptom, cause and action

Explain the effects of magnetite on a central heating system

Grab your Unit 311 Worksheet 3 and work through the six fault-finding scenarios before the next session.

central heating fault diagnosis, seven-stage rectification process, unit 311 phase 3, level 3 diploma in plumbing and domestic heating, magnetite and system faults

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The Copper Connection Podcast – Season 2, Episode 89, Unit 307 Water Treatment Explained | Level 3 Diploma & 9289 Phase 2 Plumbing Revision Podcast

Fit the wrong water treatment kit in a hard water area and the customer's boiler is furred up by year five even if every joint you made was perfect. This episode clears up the single biggest source of confusion in Unit 307 (Level 3 Diploma, and 9289 Phase 2 for apprenticeship / ST0303 apprenticeship learners): the difference between water conditioners, water softeners and drinking water filters, and which one belongs where on a domestic cold water system.

Chris Bailey walks through the chemistry of temporary hard water and limescale precipitation at 65°C, then breaks down all three magnetic, electrolytic and electronic conditioners, base-exchange softeners with the mandatory unsoftened kitchen tap rule, and every one of the six drinking water filter types your assessor will ask you to name. It's a proper UK plumbing revision session tying water treatment back into cold water systems, WRAS-approved storage cisterns and the Water Supply Regulations 1999 exactly the shared ground between the Level 3 Diploma and 9289 domestic plumbing and heating.

What you'll learn:

• Understand why calcium carbonate precipitates as limescale at 65°C and what it does to appliances
• Explain how magnetic, electrolytic and electronic conditioners change calcium behaviour without removing it
• Identify where each conditioner type is fitted (appliance-specific vs whole-house)
• Explain base exchange in a water softener and the drop from 350 mg/l down to under 10 mg/l
• Apply the unsoftened kitchen draw-off rule for wholesome drinking water
• Identify all six drinking water filter forms: activated carbon, ion exchange, sediment, reverse osmosis, distillation, disinfection
• Match a customer complaint to the correct filter on site
• Tie water treatment back into cold water storage cistern requirements and the Water Supply Regulations 1999

Grab your Unit 307 handout on domestic water treatment equipment and test yourself on naming the six filter types and their uses before your next assessment.

• 9289 phase 2
• plumbing revision podcast
• cold water systems
• mastering plumbing theory
• level 3 construction qualifications
• uk construction theory
• water treatment
• educational resources for plumbing
• cold water systems in plumbing

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The Copper Connection Podcast – Season 2, Episode 88, 9289 Phase 2 Unit 303: Energy, Heat & Power Explained Electrical and Scientific Principles.

Ever had a customer say "the tank's warm, so why's there no hot water?" This episode is the answer and it's the whole of Unit 303 Scientific Principles, Learning Outcome 3, AC 3.6, wrapped up in one worked example. Part 4 of Session 3 on the 9289 Phase 2 domestic plumbing and heating apprenticeship (ST0303), also directly relevant to the City and Guilds Level 3 plumbing Unit 303. hot water systems masterclass.

Chris walks through why heat and temperature are two different things, refreshes the joule and the Specific Heat Capacity of water (4.18 kJ/kg/°C), and shows the bridge between the plumbing world and the physics world one cubic metre of water equals 1,000 litres equals 1,000 kilograms. Then a full worked cylinder example: 0.5 m diameter, 0.9 m tall, cold in at 10°C, stored at 60°C. You'll finish knowing exactly how to calculate the heat energy required and the immersion power needed to deliver it in one hour and why a standard 3 kW element takes three-plus hours to recover a 180-litre tank.

What you'll learn:

• Distinguish between heat (quantity) and temperature (intensity)
• Recall the Specific Heat Capacity of water and why 4.18 matters
• Convert cylinder volume from cubic metres to litres to kilograms
• Calculate quantity of heat using mass × Δt × 4.18
• Calculate power in kW using kJ ÷ 3,600
• Apply the 60–65°C hot water storage rule on site
• Explain to a customer why their immersion recovery time is what it is

Grab your Unit 303 handout and Worksheet 6, run the same cylinder numbers on paper, then try it again with a 210-litre tank and a winter cold-mains temperature of 6°C.

• 9289 domestic plumbing and heating
• electrical and scientific principles
• specific heat capacity
• hot water systems masterclass
• revision tips for plumbing students
• masterclass in plumbing education
• plumbing qualifications guide
• plumbing revision guide
• mastering plumbing qualifications
• technical qualifications uk
• plumbing apprentices
• hot water safety
• passing your exams
• hot water systems
• construction theory podcast
• 9289 phase 2

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The Copper Connection Podcast – Season 2, Episode 87, The Two Minutes That Matter Most, Responding to Accidents on Site Unit 301 Health and Safety in Plumbing.

You shout through to your mate under the sink and get nothing back. Solvent cement tin still open beside him. Head down. Not moving. What you do in the next sixty seconds actually matters.

In this episode of The Copper Connection Podcast, Chris Bailey covers Session 5 of the Unit 301 deep-dive Health and Safety Systems & The Two Minutes That Matter Most, Responding to Accidents on Site Unit 301 Health and Safety in Plumbing working through LO4: know and understand how to respond to accidents. This supports the City & Guilds Level 3 Diploma in Plumbing and Domestic Heating and Phase 1 of the 9289 apprenticeship (ST0303), so it applies whichever route brought you here.

Chris covers:

• What an accident actually is — unforeseen, unplanned, uncontrolled and the wider emergencies you need to recognise, from fire and collapse to gas leaks, chemical spillage and electrocution

• The moment of discovery: raising the alarm, dialling 999, and giving the operator the nature of the incident, the location and the site entry points

• Why you send a colleague to the site entrance — and why three lost minutes can change an outcome

• Staying with the casualty, getting a first aider to attend, and informing next of kin

• The fire drill: sound the alarm, call 999, evacuate, assemble

• First-aid provision — why there are no medicines in a first-aid box, what makes a first aider a competent person, the appointed person, and the first aider's three core duties

• The calm six-step sequence when you find someone injured: make yourself safe, make the area safe, administer first aid, contact emergency services, contact the first aider, contact the supervisor

• Minor injuries — burrs on copper tube, solder burns, dust and fume irritants — including the ten minutes of cold running water that most people rush

• Fumes from solvent welding: remove, ventilate, recovery position, CPR

• Major injuries — simple and compound fractures, unconsciousness, electric shock, toxic poisoning, asphyxiation and concussion, including the twenty-four hour watch

• The paperwork that protects you — the accident book, exactly what goes in it, witness statements, and RIDDOR

• Who investigates an accident and what each role on site actually does

For your exam you need to state the requirements for first-aid provision, describe the actions to take on discovering an accident or emergency, identify the procedures for minor and major injuries, and state the recording procedures for accidents and near misses. Work through Worksheet 6 alongside the HSE's first-aid-at-work leaflet, and watch the recovery position and CPR clips more than once.

• health and safety in plumbing
• educational resources for plumbing
• masterclass in plumbing education
• plumbing apprentices
• 9289 domestic plumbing and heating
• construction theory
• construction education
• health and safety exam preparation
• 9289 phase 1
• technical qualifications in construction
• the copper connection podcast
• plumbing revision podcast
• level 2 construction qualifications
• level 2 plumbing exam preparation
• technical skills in construction

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The Copper Connection Podcast – Season 2, Episode 86, Why Copper Wins Every Race, Heat Transfer, Energy and Expansion, 9289 Phase 2 Unit 303.

Three pipes in a vice, copper, low-carbon steel, stainless, one blowlamp, one flame. Copper doesn't just win, it isn't even the same event. This episode explains exactly why.

In this episode of The Copper Connection Podcast, Chris Bailey continues Unit 303 of the 9289 apprenticeship (ST0303), 9289 Phase 2, covering AC3.4 and AC3.5 — the three methods of heat transfer, and how the units of energy, heat and power actually relate to each other.

Chris works through conduction and the coefficient of thermal conductivity (copper at 385 W/mK against expanded polystyrene at 0.03), U values and the area × U value × temperature difference heat loss formula with a full worked cavity wall example, convection and why a hot water cylinder circulates without a pump, radiation and why a patio heater warms you but not the air, where the Joule and the watt come from, specific heat capacity and why water was chosen as the heat transfer medium, and linear expansion including why a 25 metre steel steam pipe moves over 31 millimetres once steam is flowing.

You will learn to:

Explain conduction, convection and radiation, and the hot-goes-to-cold rule underneath all three

Rank common materials by coefficient of thermal conductivity in W/mK

Calculate heat loss through a structure using area, U value and temperature difference

Explain how a hot water cylinder heats by convection, and why density drives it

Explain why radiation heats objects but not the air it travels through

Derive the Joule from force and distance, and the watt as Joules per second

Convert between watts and BTU per hour on older equipment specifications

Apply specific heat capacity values for water, ice, kerosene and propylene glycol

Calculate linear expansion for copper, steel and PVC pipework using the coefficient formula

Work through Worksheet 4 on U values and the expansion calculations before the next Unit 303 session.

heat transfer, specific heat capacity, linear expansion, unit 303 phase 2, 9289 apprenticeship, ST0303

www.thecopperconnectionpodcast.co.uk

• 9289 phase 2
• electrical and scientific principles
• construction exam preparation
• construction theory podcast
• construction education
• uk construction education
• 9289 domestic plumbing and heating
• plumbing
• masterclass in construction theory
• uk construction theory
• plumbing apprentices
• level 3 construction qualifications
• building services engineering
• technical qualifications uk
• uk plumbing exams
• plumbing study resources
• revision tips for plumbing students
• masterclass in plumbing
• level 2 plumbing masterclass
• technical qualifications in construction

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