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

Hosted on Acast. See acast.com/privacy for more information.

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/

Hosted on Acast. See acast.com/privacy for more information.