When a boiler breaks down, most homeowners assume the advice they get back is purely technical — this part has failed, here’s what it costs to fix it. In reality, a lot of the advice given out across the plumbing and heating industry is shaped by something the customer never sees: how the engineer standing in front of them actually gets paid, and whether that company ever expects to see you again.
How Commission Changes the Advice You Get
At many of the larger national plumbing and heating companies, engineers aren’t simply on a wage. They’re dispatched by a call centre, and a meaningful part of their pay is tied to commission or sales targets — the more they sell on a job, whether that’s a full boiler replacement instead of a repair, premium parts instead of standard ones, or add-on extras, the more they take home. It’s rarely presented that bluntly to the customer, but the incentive is structural, not personal. Even a perfectly decent engineer working inside that system is being quietly nudged toward the more expensive recommendation, because that’s how the business model is built. And because these companies operate through national call centres rather than local relationships, most of their customers only ever use them once — after a big bill and a rushed visit, people tend to feel a little taken advantage of, and they go looking for someone else next time.
Why Local Engineers Have the Opposite Incentive
A small, local heating engineer works under the opposite incentive. I’m not on commission, and I don’t have sales targets set by someone in an office who’s never seen your boiler. My business in Streatham and South West London is built entirely on repeat customers and word-of-mouth referrals — the whole model depends on you calling me again next year, and recommending me to a neighbour. If I recommend an unnecessary replacement, or overcharge on parts, that’s not a quiet write-off buried in a call centre’s numbers. It’s my name, my van, and my reputation, and I don’t get a second chance at it. Being closer to the people I work for isn’t just a nicer way of doing business — it’s the reason the incentive runs the opposite way to a big brand. Looking after a customer properly is what keeps the phone ringing, not what a national company’s pricing model happens to allow.
The Price Difference: £130 vs £250
You can see the difference in plain numbers, not just in tone. A combined annual boiler service and gas safety check with me is £130 — one visit, one engineer, everything checked and certified. The same combined job through one of the larger national franchises can run to around £250, for essentially the same work. That gap isn’t really about better parts or better qualifications; it’s the cost of running call centres, franchise fees, marketing budgets and commission structures, all of which get quietly folded into your invoice before the engineer even knocks on your door.
A Real Example: Repair Over Replace
It also shows up in how the job actually gets done, not just what it costs. One of my customers, Susan, put it better than I could: “He went to great lengths to repair our boiler rather than taking the easy option of fitting a new one.” That’s the whole difference in one sentence. Fitting a new boiler is usually the easier, more profitable option for whoever’s doing the work. Taking the harder route to fix what’s actually there is what a local engineer does when their business depends on you trusting them again next year — and it’s exactly the kind of decision a commission-driven visit is quietly discouraged from making.
Which Should You Choose?
None of this means every big company gives bad advice, or that every small local engineer is automatically the better choice — there are good and bad on both sides. But it’s worth asking a simple question before you book: does this company want to see me again, or is this a one-off transaction? A local heating engineer’s whole livelihood depends on the answer being “again.” For a national call centre, it often doesn’t need to be.
If you want an honest, no-pressure diagnosis on a boiler or heating problem in Streatham or South West London, get in touch — and if you’d like to see what past customers have said about how we work, our reviews are here.