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Install central heating.
Full system install — boiler, radiators, pipework and controls — to current Building Regs and Part L.
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Costs, timelines, pitfalls and the right questions to ask before any central heating starts on central Heating Installation.
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Top tips
Hiring a central heating, without the regret.
Four moves that separate a smooth job from a nightmare.
Boiler too big or small
Wrong sizing leads to inefficient short-cycling or inadequate hot water. Heat-loss calc essential.
Skipped magnetic filter
Without a filter, sludge accumulates in radiators and damages the boiler. Adey MagnaClean is the industry standard.
No power flush
Existing dirty pipework contaminates a new boiler. Always power flush or chemically clean.
Hidden lead pipework
Pre-1970s houses may have lead pipework. Investigate and replace at install.
Costs & timeline
Know what it costs. Know when it ends.
Indicative UK ranges and what affects price.
Cost range
By job type
Inc. VAT · 2026
Source: NMT quotes
Source: NMT quotes
Combi boiler installation (small house)Worcester Bosch, Vaillant
£2.2k–£3.8k
System boiler + cylinder (medium)For larger families
£3.5k–£5.5k
Heat-loss calculation & designOften included in quote
£1–£300
Per radiator supplied and fittedIncluding TRV
£180–£450
Pipework (per radiator drop)15mm copper or plastic
£80–£200
Smart thermostat upgradeNest, Hive, Tado
£150–£350
!
Quote spread is typically ± 18% — always get 3 quotes.
At a glance
InfographicThe Central Heating briefing.
Infographic
Central Heating quick-view
A new central heating system is one of the biggest single home upgrades. Expect to pay £3,500–£8,500 for a full UK central heating installation in 2026, depending on house size, boiler type and radiator count.
What Does the Work Involve?
Gas Safe registered installer designs the system around heat-loss calculations for each room. Boiler positioned (kitchen, utility, garage), gas connection routed, condensate drain plumbed. Flow and return pipework (15mm or 22mm copper or plastic push-fit) runs to each radiator. Radiator sizes calculated by room volume. Thermostatic radiator valves (TRVs) on each radiator. Smart programmable thermostat (Nest, Hive, Tado) in living area. System filled, vented, pressure-tested, commissioned.
Typical Costs
| Item | Low (£) | High (£) | Notes |
|---|---|---|---|
| Combi boiler installation (small house) | 2,200 | 3,800 | Worcester Bosch, Vaillant |
| System boiler + cylinder (medium) | 3,500 | 5,500 | For larger families |
| Heat-loss calculation & design | 0 | 300 | Often included in quote |
| Per radiator supplied and fitted | 180 | 450 | Including TRV |
| Pipework (per radiator drop) | 80 | 200 | 15mm copper or plastic |
| Smart thermostat upgrade | 150 | 350 | Nest, Hive, Tado |
| Magnetic system filter | 120 | 300 | Adey MagnaClean, Fernox |
| Full 3-bed semi installation | 3,800 | 7,500 | Boiler + 8–10 radiators |
How Long Does It Take?
Boiler-only swap: 1–2 days. Full new central heating system (no existing pipework): 4–7 days. With chasing pipes into walls: 1–2 weeks. System commissioning: half a day extra.
DIY or Professional?
Gas Safe registered installer only. Any gas work without registration is illegal and voids home insurance. Radiator and pipework can be DIY in some cases, but boiler connection is regulated.
Choosing the Right Tradesperson
Gas Safe registered with verifiable ID number. Look for manufacturer-accredited installers (Worcester Bosch, Vaillant, Baxi Approved). Get 10-year warranty on the boiler in writing. Check the installer's recent work — boiler installation forums (Heatlist, Big Home Jobs) have honest reviews.
UK Regulations
Gas Safety (Installation and Use) Regulations 1998: all gas work must be by a Gas Safe registered engineer. Building Regs Part L: efficiency requirements for new boilers (92% ErP minimum). Part P: electrical work. Boiler Plus regulations require a system efficiency add-on (smart thermostat, weather compensation, etc).
Common Problems
- Boiler too big or small: Wrong sizing leads to inefficient short-cycling or inadequate hot water. Heat-loss calc essential.
- Skipped magnetic filter: Without a filter, sludge accumulates in radiators and damages the boiler. Adey MagnaClean is the industry standard.
- No power flush: Existing dirty pipework contaminates a new boiler. Always power flush or chemically clean.
- Hidden lead pipework: Pre-1970s houses may have lead pipework. Investigate and replace at install.
Frequently Asked Questions
Combi or system boiler?
Combi: best for 1–2 bathroom homes, no hot water cylinder needed, instant hot water. System: better for 3+ bathroom homes, stores hot water in unvented cylinder, handles multiple simultaneous demands.
What's the boiler warranty?
Worcester Bosch Greenstar: up to 10 years if installer-accredited. Vaillant ecoTEC: 7–10 years. Baxi Platinum: 10 years. Standard 1–5 years from non-accredited installers.
Do I need a power flush?
If replacing boiler on existing system: yes — sludge in old pipes kills new boilers. Chemical clean is acceptable for newer systems (under 8 years).
Smart thermostat — worth it?
Yes — Boiler Plus regulations require an efficiency upgrade with new boiler installs. Smart thermostats (Hive, Nest) save 10–25% on heating bills.
How long should central heating last?
Boiler: 12–18 years (15 typical). Pipework: 50+ years. Radiators: 20–30 years. System filter: 10+ years.
Will I need new radiators?
Often yes — undersized old radiators won't deliver enough heat. Heat-loss calculation determines proper sizing per room.
This guide was written with AI assistance and is intended for general information only. Prices are estimates based on UK averages and may vary by region. Always get at least three quotes and consult a qualified professional before starting any work.
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