Plumbers Who Retrained as Heat Pump Installers: Their Advice

The UK needs tens of thousands of additional heat pump installers to meet its climate targets. Many are coming from traditional plumbing and gas engineering backgrounds — bringing valuable skills but facing a steep learning curve. We spoke to plumbers and gas engineers who have made the transition, and they share the reality: what the training involves, how long it takes to feel confident, what the biggest challenges are, and why they believe it is the future of the heating trade.

The UK heating industry is at a generational inflection point. Gas boiler installations will eventually decline as the government pushes toward the 2035 phase-out date, while heat pump demand is rising steeply. For plumbers and gas engineers, the question is not whether to adapt, but when. The tradespeople we spoke to have already made the leap — and their experiences offer valuable insights for both aspiring installers and homeowners trying to assess installer quality. For the homeowner perspective on finding good installers, see our installation guide.

Why Plumbers Are Making the Switch

"I could see the writing on the wall. Gas boiler installations are going to decline over the next decade. Heat pumps are where the growth is. I'd rather be ahead of the curve than chasing a shrinking market." — Former gas engineer, now heat pump installer, Leeds

The motivations for switching are both practical and ideological. On the practical side, heat pump installations typically command higher prices than boiler swaps (£10,000-£18,000 vs £2,000-£4,000), demand is growing rapidly, and there is a significant skills shortage creating job security. On the ideological side, many tradespeople genuinely want to contribute to the energy transition.

The Training Journey

"The training course itself was intensive but manageable — about 3 weeks of classroom and practical work. What you can't learn in a classroom is the experience of 50 different houses with 50 different challenges. That takes time." — Former plumber, Nottingham

The typical training pathway for a plumber or gas engineer becoming a heat pump installer:

1. Core heat pump training (2-4 weeks): Covers refrigeration principles, system design, heat loss calculations, installation techniques, and commissioning. Providers include manufacturer training centres, colleges, and specialist training companies.
2. Manufacturer-specific training (1-2 days per brand): Each heat pump manufacturer offers product-specific training on their equipment, controls, and commissioning procedures.
3. Supervised installations (3-6 months): Working alongside an experienced heat pump installer to gain practical experience before working independently.
4. MCS certification: Demonstrating competence through documented installations, quality management systems, and assessment. Required for customers to access the BUS grant.

What Transfers — and What Doesn't

Plumbers and gas engineers bring significant transferable skills to heat pump installation. But they also need to unlearn some habits.

The Biggest Challenges

"The hardest thing was accepting that every installation is a design project. With boilers, you could quote in 20 minutes. With heat pumps, you need a proper survey, a heat loss calculation, and a bespoke system design. It takes longer but produces better results." — Former gas engineer, Birmingham

Retrained installers consistently identified these challenges:

• Heat loss calculations: Learning to perform accurate room-by-room calculations is technically demanding and essential
• System design thinking: Moving from product installation to system design requires a different mindset
• Customer education: Explaining how heat pumps work differently from boilers takes time and patience
• Commissioning complexity: Setting up weather compensation curves, flow rates, and controls correctly
• Business model change: Higher-value, longer-duration installations require different scheduling and cash flow management

Lessons from First Installations

"My first solo installation took 4 days and I second-guessed every decision. My twentieth took 2 days and felt routine. The learning curve is steep but the skills become second nature." — Heat pump installer, Cardiff

Common lessons from early installations:

• Always complete the heat loss calculation before quoting — never estimate
• Spend more time on commissioning than you think is necessary
• Explain everything to the homeowner — twice if needed
• Call the manufacturer's technical support line early rather than guessing
• Take photos at every stage for MCS documentation

These insights mirror the common mistakes experienced installers identify — confirming that thorough training and supervised experience are essential before going solo.

The Business Reality

"Financially, the switch has been excellent. Heat pump installations are more complex but better paid. My average job value has gone from £3,000 for a boiler to £12,000 for a heat pump. And I'm fully booked 3 months ahead." — Installer, Reading

The economics favour the transition:

• Higher per-job revenue (£10,000-£18,000 vs £2,000-£4,000 for boilers)
• Growing demand with insufficient supply
• Government-backed market through the BUS grant
• Career longevity in a growing rather than declining sector

Advice for Homeowners from Retrained Installers

We asked retrained installers what they wish homeowners knew:

• "Ask about experience specifically with heat pumps" — MCS certification is necessary but not sufficient. Ask how many heat pump installations the engineer has completed, not just how long they have been a plumber
• "A good installer will spend an hour surveying before quoting" — If someone quotes in 15 minutes, they are guessing. A proper survey takes 1-3 hours
• "The cheapest quote is often the worst" — Low prices usually mean corners are being cut somewhere — often on radiator assessments or commissioning time
• "Be patient during the first few weeks" — The system takes time to settle and optimise. Do not change settings constantly
• "Consider solar panels at the same time" — If your roof is suitable, installing both together saves on scaffolding and electrical work

Frequently Asked Questions

How long does it take to retrain as a heat pump installer?

Core training takes 2-4 weeks. Gaining MCS certification and becoming confident takes 6-12 months with 10-20 supervised installations.

How much does heat pump installer training cost?

£1,500-£5,000 for courses, plus £1,000-£2,000 per year for MCS certification. Many courses are partially government-funded.

Is there enough demand for heat pump installers?

Yes. The UK needs 30,000-40,000 trained installers; currently there are around 15,000-20,000. Most installers report full order books.

Can a gas engineer install heat pumps without retraining?

No. Specific training and MCS certification are required for safe, effective installations and for customers to access the BUS grant.

What is the biggest challenge when switching to heat pumps?

Changing from product installation to system design thinking. Every property requires bespoke heat loss calculations and system design. Our sizing errors guide shows what happens when this is not done properly.