Boiler Installation in South London
Gas Safe registered engineers supplying and installing new boilers, replacing old systems and handling all boiler-related work across South London.
• Gas Safe registered
• Fully insured
• 12-month workmanship guarantee
• Local South London company
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or email info@topfixplumbing.co.uk
Or complete the form below and we’ll contact you shortly.
Boiler Installation & Replacement in South London
From supplying and fitting a new boiler to replacing an old inefficient system — our Gas Safe engineers handle the full job, including all pipework, controls and commissioning.
Emergency
Rapid response for leaks, burst pipes and urgent plumbing emergencies
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or email info@topfixplumbing.co.uk
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Heating
Expert repair of heating systems, radiators and hot water issues and others
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or email info@topfixplumbing.co.uk
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Bathroom
Complete bathroom plumbing, repairs and professional installations.
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or email info@topfixplumbing.co.uk
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Plumbing
General plumbing services for kitchens, bathrooms and household systems.
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or email info@topfixplumbing.co.uk
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Boiler
Professional installation of energy-efficient gas boilers.
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or email info@topfixplumbing.co.uk
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Electrical
Safe and certified electrical installation and repair services.
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or email info@topfixplumbing.co.uk
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Why choose TopFix for your new boiler?
A new boiler is one of the bigger investments you'll make in your home. Getting the wrong size, the wrong brand or a poor installation can cost you for years. We don't just fit whatever's cheapest — we'll look at your property, your hot water demand and your existing pipework and recommend what actually makes sense.
Most of the homes we work in across South London are older properties — Victorian terraces, Edwardian semis, period conversions. These come with their own complications. Low pressure, narrow flue routes, pipework that wasn't installed with modern boilers in mind. We've dealt with all of it.
Every installation comes with full commissioning, a benchmark certificate and manufacturer registration. The paperwork matters — it's what keeps your warranty valid.
All major brands supplied
Worcester Bosch, Vaillant, Ideal, Baxi, Viessmann — we work with all leading manufacturers.
Gas Safe registered
All gas and heating work is carried out by fully certified Gas Safe registered engineers.
Transparent pricing
Clear quotes before work starts — no hidden fees, no surprises.
Emergency availability
No heat or hot water? We're available day and night for emergency heating call-outs.
Full installation service
We handle everything — supply, installation, commissioning, old boiler removal and certificate.
Trusted by South London customers
Highly rated heating service with real reviews from local homeowners and landlords.
Boiler Replacement in South London
Not sure if your boiler needs replacing? Here's what usually brings people to us:
Signs you may need a new boiler:
Which Boiler Brand is Right for Your Home?
Honestly, there's no straight answer on which boiler to go with — it depends on the property, how many people are using hot water, what the pressure's like, what the existing pipework can handle. What we can do is tell you what we actually see in South London homes day to day.
Worcester Bosch is what we fit most often. Parts are easy to get hold of, the warranty support is solid, and they just tend to keep going. Not flashy, but reliable — which is usually what you want from a boiler.
Vaillant is a step up in build quality. German-made, very well engineered, and they tend to suit older properties well. You'll pay a bit more upfront, but they're efficient and they last.
Ideal is the one we recommend when someone wants something decent without spending more than they need to. Good track record, easy to service, nothing complicated about them.
Baxi works well in flats and smaller houses. Reasonably priced, parts are everywhere, and any engineer worth their salt can work on one.
Viessmann is the premium end. If you're planning to stay in the property for the long haul and want to fit something once and forget about it, it's worth the extra money.
If you're not sure what makes sense for your place, just ask us. We'll tell you what we'd actually put in our own homes — not what gives us the best margin.
Boiler Installations Across South London
Our Gas Safe engineers install and replace boilers across South London — fast response, no long waiting lists
Sutton
Kingston upon Thames
Battersea
Putney
Clapham
Wimbledon
Our finished works
A selection of recently completed plumbing and heating jobs across South London homes and properties.
How We Handle a New Boiler Installation
We keep it straightforward — no surprises, no delays.
Tell us what’s wrong
Give us a quick call or send a request — describe the problem in a few words and we’ll take it from there.
We assess & confirm
We review the issue, explain what needs to be done and confirm the price before any work begins.
We send the right engineer
Our Gas Safe engineer arrives with the new boiler, removes the old one and completes the full installation including all connections, controls and pipework.
Problem solved
The job is completed efficiently, tested properly, and your space is left clean and safe.
What South London Homeowners Say About Our Boiler Installations
Real reviews from customers across South London.
Had a 15-year-old Vaillant that finally gave up. TopFix came out the next day, surveyed the job, gave us a quote on the spot and had a new Worcester Bosch fitted three days later. The engineer was tidy, talked us through everything and sorted out a smart thermostat while he was at it. Couldn't fault it.
We're in a Victorian conversion with some awkward pipework and not much room for a flue. A couple of other companies said it would be complicated and quoted accordingly. TopFix looked at it properly and came back with a sensible solution at a fair price. Installed without any issues. Very happy.
Straightforward job — old combi out, new one in. What stood out was how easy the whole thing was to arrange. Quote came through same day, they were on-site within the week, and everything was explained clearly throughout. Boiler's running perfectly.
Frequently asked questions
The cost depends on the boiler model, the complexity of the installation and whether any additional pipework or modifications are needed. Most straightforward combi-for-combi swaps in South London come in at a fixed price we'll confirm before we start. We don't do vague ranges — you'll get a proper quote after we've seen the job.
A standard replacement — like-for-like, same location — usually takes one full day. More complex jobs involving a change of boiler type, new pipework or flue alterations may take longer. We'll tell you upfront what to expect.
It depends on the property. Worcester Bosch and Vaillant are consistently reliable and we install them most often. For smaller properties or where budget matters, Ideal and Baxi are solid choices. We'll always recommend what suits your home specifically — not whatever has the best margin for us
Almost certainly, if your current boiler is more than 10 years old. Modern condensing boilers run at over 90% efficiency. Older models often operate at 70–80% or lower. Over a full year, the savings can be significant — especially with rising energy costs.
Yes — old boiler removal and disposal is included as standard. We'll take the unit away and ensure it's disposed of correctly.
Manufacturer warranties vary by brand and model — typically between 5 and 10 years on parts and heat exchanger. We register all boilers directly with the manufacturer on the day of installation, so your warranty is activated straight away.
This is something we deal with regularly in South London's older housing stock. Tight airing cupboards, unusual flue routes, restricted access — we'll survey the job first and tell you exactly what's involved before you commit to anything.
Boiler Installation & Replacement Across South London
South London's got a lot of older housing stock — and if you've been putting off replacing an ageing boiler because you're not sure what's involved or what it'll cost, we get it. It's one of those jobs that feels bigger than it needs to be. In most cases, a straightforward replacement takes a day. We turn up, take the old unit out, put the new one in, commission it properly and leave everything tidy. That's usually it.
We do a lot of boiler work across the borough — Sutton, Wimbledon, Clapham, Putney, Battersea, Kingston upon Thames. A lot of it is in Victorian and Edwardian properties where the setup isn't always straightforward: narrow flue routes, tight plant rooms, pipework that wasn't designed with modern boilers in mind. We've dealt with all of it. If something's going to be complicated, we'll tell you upfront — not halfway through the job.
All our engineers are Gas Safe registered. Every installation is fully commissioned, benchmarked and registered with the manufacturer on the day — so your warranty is valid from the moment we leave. And the price we quote before we start is the price on the invoice. That shouldn't need saying, but apparently it does.