Boiler Repair in Thornaby

“We’ve been working in Thornaby for years. Most areas, a boiler’s a boiler. Here, it’s microbore pipework and back boilers. The 60s estates taught us things most plumbers never see.”

Covering all of Thornaby — Mandale, Stainsby, Bassleton, Teesdale, Thornaby Village, and the riverside apartments. Gas Safe registered (972035), same-day service when we can swing it. We know the area’s heating history, from Victorian terraces with original cast iron to 1960s-70s estates with temperamental microbore systems, through to the modern riverside combis that still break when you least expect it.

Common Boiler Problems in Thornaby

Most calls we get in Thornaby are straightforward — boiler not firing, cutting out randomly, kettling noises, no hot water, pressure drops, and radiators not heating evenly. But the 1960s-70s estates in Mandale and Stainsby throw up challenges that newer areas don’t see.

Microbore pipework is the big one. These narrow 8-10mm pipes were popular in the 60s and 70s because they were cheaper to install and easier to thread through solid walls. Problem is, they block easily. Sludge buildup that a standard 15mm pipe would shrug off can completely choke a microbore run. You get cold radiators, pressure problems, and pumps working overtime trying to push water through increasingly narrow passages.

Back boilers are the other Thornaby specialty. Hidden behind the gas fire in the living room, they heat water through a back burner that most modern engineers have never touched. They’re inefficient, awkward to service, and parts are getting harder to find. But plenty are still running in Mandale and Stainsby, and when they break, you need someone who knows how they work. We’ve fixed enough of them to diagnose problems quickly and stock the parts that fail most often.

The riverside apartments are a different world — modern combis, pressurised systems, digital displays. They still break. Diverter valves stick, pumps seize, PCBs fail. But at least the pipework’s standard and we can get parts next-day for most brands.

Boiler Repair Pricing

| Diagnostic and simple repair | From £75 | | Thermostat or sensor replacement | £75 - £150 | | Diverter valve replacement | £150 - £250 | | Fan replacement | £150 - £250 | | PCB (circuit board) replacement | £200 - £400 | | Gas valve replacement | £200 - £350 | | Pump replacement | £150 - £300 | | Heat exchanger replacement | £300 - £500 |

Prices include labour and VAT. Parts depend on the brand and model. If we diagnose a problem that’s uneconomical to fix, we’ll tell you straight — no point throwing £400 at a PCB when the boiler’s on its last legs anyway.

What’s Included

Every repair starts with diagnosis. We check the fault codes, test the obvious suspects, and trace the problem back to the actual cause. Once we know what’s broken, we’ll explain what needs doing and what it’ll cost before we touch anything.

Common parts — thermostats, sensors, diverter valves, fans — we carry in the van for Worcester Bosch, Vaillant, Baxi, Ideal, and most common brands. First-visit fix when we can. If we need to order something specialist, we’ll tell you the timeline upfront.

Everything’s covered by a 12-month guarantee on parts and labour. If the same fault comes back, we’ll fix it again at no extra charge.

Brands We Work With

Worcester Bosch, Vaillant, Baxi, Ideal, Glow-worm, Potterton, Vokera, Main, Alpha, Ariston, Ferroli, Viessmann. If it’s Gas Safe compliant, we can work on it. Obscure brands or obsolete models might need parts ordering, but we’ve got trade accounts with the major suppliers and can usually get what we need within a day or two.

Our Repair Process

Call us and we’ll book you in — same day if there’s a slot, next day if not. Emergency appointments for genuine no-heating situations when it’s freezing outside.

We turn up, diagnose the problem, and give you a fixed price before we start the repair. No hidden extras, no guesswork billing. If it’s a simple fix — resetting the system, adjusting the pressure, clearing an airlock — we’ll sort it and charge the minimum call-out. If it needs parts or labour, you’ll know exactly what you’re paying before we proceed.

Once it’s fixed, we test the system properly. Hot water running, radiators heating evenly, pressure stable, no fault codes. We’ll show you what we’ve done and explain how to avoid the same problem in future if it’s something preventable.

Repair or Replace?

Sometimes a repair makes sense, sometimes it doesn’t. If your boiler’s under 10 years old and the fault’s a worn part, fixing it is usually the smart move. If it’s over 15 years old and you’re looking at a big repair bill — heat exchanger, gas valve, multiple parts failing — replacement might be more economical in the long run.

We’ll give you honest advice. We do both repairs and installations, so there’s no incentive to push you one way or the other. If it’s fixable and worth fixing, we’ll fix it. If it’s not, we’ll tell you what a replacement would cost and let you decide.

Microbore and Back Boiler Systems

Thornaby’s 1960s-70s estates are some of the only places we still see microbore systems regularly. The narrow pipework — 8mm to 10mm instead of the standard 15mm — seemed like a good idea at the time. Easier to install, cheaper, less disruption to solid walls. But decades of use mean sludge buildup, corrosion, and blockages.

When microbore pipes block, you get all sorts of symptoms. Cold radiators at the end of runs, pressure dropping constantly, boiler cycling on and off, strange noises from the pump. The boiler itself might be fine — it’s the pipework strangling the system.

We can diagnose microbore problems and recommend solutions. Sometimes a powerflush clears the sludge and buys you a few more years. Sometimes the pipework’s too far gone and you’re looking at partial or full re-piping. We’ll check flow rates, inspect the visible pipework, and give you realistic options.

Back boilers are another Thornaby quirk. Tucked behind gas fires in 1960s-70s living rooms, they’re inefficient and parts are getting scarce. But if yours is still running and you just need a repair, we’ve done enough of them to know the common failure points. Thermocouples, gas valves, pilot assemblies — we carry spares for the back boilers still in service around Mandale and Stainsby.

If you’re thinking about replacing a back boiler, we can handle the full job — remove the old back boiler and gas fire, fit a modern combi on the wall, re-pipe the system if needed. But if you just need it fixed and running for another winter, we can usually sort that too.

How quickly can you get to Thornaby?

Same-day when we can. If you call early morning and there’s a slot, we’ll aim for that afternoon. Emergencies — no heating in winter, gas smell, dangerous faults — we’ll prioritise. Non-urgent repairs might be next day, depending on the diary. Thornaby’s local to us, so we’re not travelling across the region to get to you.

Do you charge a call-out fee?

No separate call-out. Minimum charge is £75, which covers diagnosis and simple repairs. If it’s a bigger job, that £75 is included in the final price. You’re not paying a call-out and then labour on top — it’s all rolled into one fixed price for the work.

Can you fix back boilers and microbore systems?

Yes. Thornaby’s one of the few areas where we still see these systems regularly. We carry parts for common back boiler repairs and we know how to diagnose microbore blockages and pressure problems. If the system’s too far gone, we’ll tell you — but if it’s fixable, we’ll fix it.

What if the repair costs more than expected?

It won’t. We diagnose first, give you a fixed price, and only proceed when you’ve agreed to it. If we find additional problems once we’ve started, we’ll stop and discuss options before continuing. No surprise bills, no guesswork.

Do you service all boiler brands?

Most of them. Worcester Bosch, Vaillant, Baxi, Ideal, Glow-worm, Potterton, and the other common brands — we work on them regularly. Obsolete or very obscure brands might need parts ordering, which adds a day or two. If we can’t get parts or don’t think a repair is viable, we’ll tell you upfront.

Need a repair? Book online or see our full boiler repair service. More on Thornaby coverage.