Central Heating in Thornaby

New central heating from £2,500. Microbore upgrade specialists. Gas Safe registered (972035).

We cover all of Thornaby — Mandale, Stainsby, Bassleton, Teesdale, Thornaby Village, and the riverside apartments. Gas Safe registered (972035). Thornaby’s got a particular quirk that we deal with regularly: the 1960s-70s estates are full of microbore pipework. These narrow 8mm and 10mm pipes restrict water flow, cause cold spots, and make modern boilers underperform. If you live on one of these estates and your heating has never worked brilliantly, microbore is probably the reason.

Common Central Heating Problems in Thornaby

Cold radiators despite the boiler running — The most common complaint we get from Mandale and Stainsby properties. Microbore pipework restricts flow so much that radiators furthest from the boiler barely get warm. The boiler’s working hard, burning gas, but the heat isn’t reaching where it needs to go. Upgrading to standard 15mm and 22mm copper solves this completely.

Radiators cold at the bottom, warm at the top — Sludge and magnetite settling in the bottom of radiators. Microbore systems are particularly prone to this because the narrow pipes trap debris more easily and the lower flow rate lets sludge settle rather than circulate to the filter. A powerflush helps, but if the microbore is the underlying problem, flushing only buys you time.

Boiler short-cycling — The boiler fires up, runs for a few minutes, then shuts off again. Repeats constantly. With microbore, the restricted flow causes the boiler to overheat quickly because the water can’t circulate fast enough. The boiler’s safety cut-out kicks in, it cools down, fires again, and the cycle continues. It’s inefficient and wears the boiler out faster.

Noisy system — banging and ticking — Microbore pipes expand and contract as hot water flows through them. Because they’re narrow and often run through floor joists without proper clips, they tick, click, and sometimes bang as they heat up and cool down. It’s annoying and can be loud enough to hear through the floor.

Central Heating Costs

Job	Guide Price
New central heating system (small property)	From £2,500
New central heating system (3-4 bed)	£3,500 - £5,500
Microbore to standard pipework upgrade	£1,500 - £3,000
Additional radiator (supply and fit)	£250 - £400
Smart thermostat installation	£150 - £300
System upgrade (conventional to combi)	£2,000 - £3,500
Powerflush	£300 - £500

Prices vary by property size and what’s involved. Microbore replacements cost more because of the pipework labour. We survey and give you a fixed quote.

What’s Included

• Room-by-room heat loss calculation
• Full system design — boiler, radiators, pipework, controls
• Supply of all materials and components
• Installation by Gas Safe registered engineers
• Removal of old microbore pipework (if upgrading)
• System flush and chemical inhibitor treatment
• Magnetic filter installation
• Full commissioning and testing
• Gas Safe certificate and warranty registration
• 12-month workmanship guarantee

Our Process

Call us or book online and we’ll arrange a survey. We’ll check your existing system, identify what type of pipework you’ve got, measure every room, and discuss your options. You’ll get a detailed, itemised quote within a couple of days. Once you’re happy, we agree a start date. Standard installations take 2-5 days. Microbore upgrades take longer — typically 3-5 days because we’re stripping out old pipe and running new copper throughout the property. After fitting, we commission everything, test every radiator, and hand over your paperwork.

The Microbore Problem: Mandale, Stainsby, and Bassleton

The 1960s-70s estates across Thornaby were built with microbore central heating. At the time, it made sense — 8mm and 10mm copper pipe was cheaper, quicker to install, and worked fine with the small boilers of the era. But modern condensing boilers need decent flow rates to operate efficiently, and microbore can’t deliver that.

Here’s what typically happens: the boiler fires at 24kW or more, but the narrow pipes can only carry a fraction of that heat to the radiators. The return water temperature stays high because the flow is so slow, which stops the boiler from condensing properly. You’re burning more gas than you should for less heat output.

We upgrade microbore systems by stripping out the old narrow pipework and replacing it with standard 15mm radiator feeds and 22mm flow and return mains. It’s more disruptive than a straight boiler swap — we need to lift floorboards and route new pipe — but the improvement is dramatic. Radiators that never got properly warm suddenly heat up fast. The boiler runs more efficiently. And the system is quieter because the pipes aren’t straining to push water through narrow tubes.

Thornaby Village and Riverside Properties

Thornaby Village has some of the older properties in the area — Victorian terraces with solid walls and original layouts. These need careful pipework routing. Surface-mounted copper, neatly run and boxed in where needed. The properties are compact, so system design is straightforward, but the solid walls mean we can’t hide pipes in cavities.

Riverside apartments along the Tees are modern builds with standard layouts and combi boilers. Most were built in the 2000s and the original boilers are now reaching end of life. Replacing like-for-like is usually straightforward. Some apartments have restrictions on what work can be done, so we check with management companies before starting.

System Types We Work On

Combi boilers — Heating and hot water from one unit. Most common in Thornaby’s housing stock. We install Worcester Bosch, Vaillant, Ideal, Baxi, and other major brands.

System boilers — Paired with an unvented cylinder for mains-pressure hot water. Better for properties with multiple bathrooms or high hot water demand.

Conventional (gravity-fed) — Still found in some older Thornaby properties. We can maintain these or upgrade them to a modern pressurised system, which is usually the better option if you’re changing the boiler anyway.

Prevention Tips

• Bleed radiators at the start of every heating season — especially important with microbore systems where air gets trapped more easily
• Check boiler pressure monthly (1-1.5 bar when cold)
• If you’ve got microbore and your radiators are slow to heat, get a professional assessment — the pipework may be the bottleneck
• Book an annual boiler service to maintain efficiency and keep your warranty valid
• Have your magnetic filter cleaned during every service
• Don’t turn radiators off in unused rooms completely — leave TRVs on the frost setting to prevent damp

What exactly is microbore pipework and why is it a problem?

Microbore is narrow copper pipe — typically 8mm or 10mm diameter — used in many 1960s-70s heating installations. It connects radiators to a central manifold rather than running pipe directly from the boiler. The problem is flow restriction. Modern boilers need a decent flow rate to operate efficiently, and microbore can’t deliver enough water to heat all radiators properly at the same time. The result is cold spots, slow warm-up times, and a boiler that wastes gas because it can’t condense properly. Upgrading to standard 15mm and 22mm pipework fixes all of these issues.

How long does a microbore upgrade take?

Typically 3-5 days, depending on the size of the property and how accessible the pipework is. We need to strip out the old microbore from under floors and through joists, then run new standard copper in its place. It’s more involved than a boiler swap because we’re working throughout the property rather than just in the boiler location. We lift floorboards carefully and put them back properly. For a standard 3-bed semi on the Mandale or Stainsby estates, plan for about four days.

Can I just replace the boiler without upgrading from microbore?

You can, and we do it when that’s what the customer wants. A new boiler will be more efficient than the old one regardless of the pipework. But you won’t get the full benefit — the microbore will still restrict flow and cause the same circulation issues. If budget is a concern, a new boiler now with a pipework upgrade later is a reasonable approach. Just be aware that the new boiler won’t perform at its best until the pipework catches up.

Do you install smart heating controls?

Yes. We install Hive, Nest, tado, Honeywell EvoHome, and most other smart thermostats and controls. For a straightforward setup, Hive or Nest gives you smartphone control and scheduling. For more control, Honeywell EvoHome lets you set individual room temperatures using wireless TRVs. We’ll recommend what suits your property and budget. Smart controls are particularly worthwhile after a microbore upgrade because the system can actually respond properly to the commands.

Is it worth replacing the whole system or just the boiler?

It depends on the condition of your existing radiators and pipework. If your radiators are in good shape and the pipework is standard bore (not microbore), a boiler swap with new controls might be all you need. If you’ve got microbore pipework, old radiators, or a system that’s never heated the house properly, a full replacement makes more sense. We’ll assess everything during the survey and tell you honestly what needs replacing and what can stay. No point spending money on parts that are still doing their job.

Need a new system or a microbore upgrade? Get a quote or see our full central heating service. We also cover the wider Thornaby area for all heating and plumbing work.