Old boiler finally given up? Repair bills piling up? Energy bills through the roof? We install new energy-efficient boilers across London, usually within 1–2 days of your survey.
Heatbox installs all major brands including Worcester Bosch, Vaillant, Baxi, Ideal and Viessmann. Our Gas Safe engineers cover Bexley, Greenwich, Lewisham, Bromley and all London areas. Every installation comes with 5–12 year manufacturer warranties (depending on brand) plus our workmanship guarantee.
Over 15 years installing boilers across London. We’ll help you choose the right boiler, size it properly for your property and install it to the highest standards. Installations from £1,800 including VAT.
Here’s when replacement makes more sense than repair:
Boilers typically last 12–15 years. After this, efficiency drops and breakdowns become more frequent.
Got quoted £800–£1,000 for a repair? That money is often better spent on a new boiler with a long warranty.
One breakdown? Fix it. Three breakdowns? It’s time to replace.
Old boilers run at 65–75% efficiency. Modern condensing boilers hit 92–94%. That’s a 20–25% reduction in gas consumption, saving hundreds per year on London’s energy prices.
Adding rooms? The old boiler might not cope with extra radiators. Extension work is the perfect time to upgrade to a properly sized system.
Just bought a house with an ancient boiler? Don’t wait for it to die in January. Get it done on your terms, not in a winter emergency.
Got a regular boiler with a massive cylinder taking up space? Switching to a combi boiler frees up that cupboard. A popular choice in London properties where space is premium.
We’re officially approved installers for Worcester Bosch and Vaillant, the UK’s top two boiler manufacturers. This matters because:
Not locked into one brand. We install:
UK’s number one. Greenstar range offers 12-year warranties. Excellent reliability, parts always available.
German engineering. ecoTEC range with 10-year warranties. Slightly quieter than Worcester, excellent build quality.
British brand, competitive pricing. Duo-tec range offers good efficiency at mid-range prices. 7–10 year warranties available.
Popular across London. Logic range is affordable and reliable. 7–10 year warranties depending on model.
Premium German brand. Vitodens range for those wanting top-level warranties and build quality.
We’ll recommend what suits your property, usage and budget — not what earns us most commission.
We’re officially approved installers for Worcester Bosch and Vaillant, the UK’s top two boiler manufacturers. This matters because:
We calculate your actual heat requirements: property size, insulation levels, number of radiators, hot water demand. Too small and you’re cold. Too big and you’re wasting money. We get it right.
Most straightforward installations (like-for-like combi to combi) take one day. More complex jobs (system to combi, relocating boiler) take two days. You’ll know the timeline after the survey.
Plus our workmanship guarantee covering installation quality.
Every installation meets Building Regulations Part L (energy efficiency). We handle Building Control notification through Competent Person Schemes — no extra hassle for you.
Not just swapping the boiler. We’ll assess your pipework, radiators, controls. Upgrade what needs upgrading, keep what doesn’t. Complete heating system, not just a box on the wall.
Worcester Bosch Greenstar range dominates London installations for good reason. Excellent reliability, parts available everywhere, strong customer service.
Why choose this brand: If something goes wrong in 10 years, parts will still be available. Can’t say that for every brand.
Vaillant ecoTEC range offers slightly quieter operation than Worcester. Build quality is exceptional. Slightly higher purchase price but long-term reliability.
Why choose this brand: Quieter operation matters in flats and smaller properties. Premium feel.
Baxi Duo-Tec range offers good efficiency at mid-range pricing. Reliability improved significantly in recent years. Good choice for budget-conscious buyers wanting quality.
Why choose this brand: Lower upfront cost without sacrificing too much quality. Decent warranties.
Ideal Logic range is everywhere in London rental properties and owner-occupied homes. Straightforward, reliable, affordable. Not fancy, just works.
Why choose this brand: Affordable reliability. Perfect if you don’t need premium features.
Viessmann Vitodens range for those wanting the best. Premium pricing but exceptional build quality and efficiency. 10-year warranties standard.
Why choose this brand: High-end properties, customers wanting absolute best quality and longevity.
Some installers only fit one brand because they get better margins. We fit what’s right for you.
Honest advice based on your situation, not our profit margin.
We’ll visit your property (no charge) to assess:
Survey takes 30–45 minutes. You’ll get a detailed quote within 24 hours covering everything — boiler, installation, controls, any extras needed.
We’ll explain options based on your survey:
No pressure. Take time to decide. Quote valid for 30 days.
Once you approve, we’ll book installation. Most jobs happen within 1–2 weeks (sooner if urgent). You’ll know exact dates before we start.
Day one, we’ll:
Your property protected throughout — dust sheets, careful handling.
We’ll:
Everything to manufacturer specifications and Building Regulations.
Before commissioning:
This step is crucial — skipping it voids warranties and causes premature failures.
We’ll:
You’ll get:
We’ll show you how to top up pressure, reset if needed, basic troubleshooting.
We clean up properly:
Your property left tidy.
Boiler installations in London typically range £1,800–£3,500 depending on complexity.
Like-for-like combi replacement:
Takes 1 day. Lower end if you choose mid-range brand (Ideal, Baxi). Higher end for premium (Worcester, Vaillant).
Combi replacement with upgrades:
Takes 1 day, occasionally 2 if extensive flushing needed.
System changes or difficult installs:
Takes 1–2 days depending on scope.
Budget brands (Baxi, Ideal): £800–£1,200
Mid-range (Worcester Bosch, Vaillant): £1,200–£1,800
Premium (Viessmann): £1,800–£2,200+
Ground floor flat: Standard pricing
High-rise (lift access): Possible additional charge for equipment transport
House with loft installation: More labour time
Clean system needing basic flush: Included in standard price
Heavily sludged system: Full powerflush adds £400–£600
Corroded pipework needing replacement: Priced separately
Magnetic filter: £100–£150 (highly recommended)
Smart controls: £150–£250
New radiators: £80–£150 each
Thermostatic radiator valves (TRVs): £30–£50 each
Standard installation: Normal pricing
Emergency replacement (old boiler dead, winter): Possible premium for urgent scheduling
All quotes include VAT, installation labour, Building Control notification, commissioning and warranty registration.
Space is usually tight in London flats. Combination boilers work best — no cylinder eating up cupboard space. Wall-hung installation keeps floor space clear.
Considerations:
Flue termination rules in apartment blocks (some require scaffolding for high-level terminations)
Building management approval sometimes needed
Noise transmission to neighbours (Vaillant slightly quieter)
Gas meter location and pipe runs
Water pressure (some high-rises have poor pressure affecting combi performance)
We’ve installed hundreds in London flats. We know the complications and work around them.
Period properties often have system boilers with hot water cylinders. You can switch to combi and gain space, or stick with system boiler and keep excellent hot water pressure.
Original pipework might be undersized (we’ll advise on upgrades)
Cast iron radiators compatible but need checking
Flue routes respecting property character (conservation areas have restrictions)
Boiler location options (many lack utility rooms, so kitchen installation common)
Solid walls affecting pipework routing
Listed buildings require sensitive approaches. We’ve done plenty and know what’s allowed.
Usually have combi boilers with sealed systems. Straightforward replacements. If extending, we’ll calculate whether existing boiler has capacity or needs upgrading.
Landlords want reliable, affordable boilers. Ideal and Baxi make sense — good warranties, lower upfront cost, widely serviceable.
We do lots of landlord installs. Bulk discounts available for portfolio work.
Most popular in London. Heats water on demand — no storage tank needed.
Separate hot water cylinder, but no cold water tank (uses mains pressure).
Hot water cylinder plus cold water tank in loft. Old-fashioned but still relevant for some properties.
Only Gas Safe registered engineers can legally install gas boilers in the UK. We’re registered. Always check credentials unregistered installation voids insurance and is dangerous.
Boiler installation falls under Part L (Conservation of Fuel and Power). New boilers must:
We handle Building Control notification through Competent Person Schemes. You’ll receive compliance certificate proving legal installation.
Most boiler installations don’t need planning permission. Exceptions:
We’ll advise if your situation needs additional approvals.
If you’re a landlord installing a boiler in rental property:
We provide all necessary certification for landlord compliance.
We install boilers throughout London with specialist focus on South and South East London.
Zone 1: SE1–SE28, DA1–DA18, BR1–BR7, CR0–CR9, SW2–SW20
Zone 2: W1–W14, SW1–SW20, NW1–NW11, selected Central London
Call to confirm your specific area.
You don’t need to do much. Clear access to current boiler and where new one’s going. Move valuables away from work area. That’s it.
You don’t need to do much. Clear access to current boiler and where new one’s going. Move valuables away from work area. That’s it.
We’ll test everything thoroughly before leaving. You’ll get full demonstration. Ask questions — we want you confident operating your new system. First few days, monitor it. Pressure should stay stable. Heating and hot water should work perfectly. Contact us immediately if anything seems off.
New boilers need annual servicing to maintain warranties. Book your first service 12 months after installation. We’ll remind you when it’s due.
After installing your new boiler, customers often book:
Keep your new boiler under warranty. Required annually for warranty validity.
Essential before new boiler installation if your old system is sludged. Protects your investment.
Upgrading radiators while installing new boiler? We’ll design your whole system.
Add Hive or Nest for smartphone control and better efficiency.
Landlords need annual certificates. We provide these for newly installed boilers.
Usually yes. We'll assess during survey. Cast iron radiators in Victorian properties work fine. Standard panel radiators always compatible. If radiators are heavily sludged, we'll recommend powerflush or replacement. Sometimes radiator valves need upgrading to TRVs for Building Regulations compliance.
Straightforward combi-to-combi replacements start around £1,800-£2,400. Standard installations with better boilers and upgrades run £2,400-£3,000. Complex jobs (system changes, relocations) reach £3,000-£3,500+. Price depends on boiler brand chosen, property type, system condition and any extras. We provide detailed quotes after free surveys—no hidden charges.
Most straightforward replacements (like-for-like combi) take one full day. More complex installations (switching boiler types, relocations, extensive pipework) take 1-2 days. You'll know the exact timeline after your survey. We work efficiently without cutting corners.
We install Worcester Bosch, Vaillant, Baxi, Ideal and Viessmann. Worcester Bosch offers excellent reliability and up to 12-year warranties—our most popular choice. Vaillant provides premium German engineering with 10-year warranties. Baxi and Ideal offer good quality at lower prices with 7-10 year warranties. Viessmann is top-end with 10-year standard warranties. We'll recommend based on your property, usage and budget.
Yes—manufacturer warranties of 5-12 years depending on brand and registration. Worcester Bosch offers up to 12 years through approved installers (that's us). Vaillant offers up to 10 years. Baxi and Ideal offer 7-10 years. Plus our workmanship guarantee covering installation quality. We handle all warranty registrations.
Absolutely. We've installed hundreds in London flats. Combis work best for space-saving. We handle building management approvals, flue termination requirements and noise considerations. High-rise access is fine—we've done installations up to 20+ floors.
We handle Building Control notification through Competent Person Schemes—you don't need to do anything. After installation, you'll receive a Building Regulations compliance certificate proving legal installation. Required if you ever sell your property.
Yes, we've done many listed building installations. These require sensitive approaches respecting property character. Sometimes planning consent needed for external changes (flues). We'll advise what's required and help with applications if necessary.
We remove it, dispose of it properly and clean up fully. Old boilers contain recyclable materials which we handle correctly. All packaging and waste removed from your property.
Don't wait for a breakdown to discover your boiler needs attention. Book your annual service now and keep your heating running efficiently all winter.
Serving Bexley, Greenwich, Lewisham, Bromley, Croydon & All South London
Gas Safe Registered | Worcester Bosch & Vaillant Approved | Fully Insured
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