New Boiler Installation London

New Boiler Installation Help Centre

What to consider, what to expect, and how to choose the right boiler.

When Should You Replace Your Boiler?

A new boiler is a significant investment. However, if your current boiler is struggling, replacement often makes more financial sense than repeated repairs.

Consider replacement if:

• Your boiler is 12 to 15 years old or more: Efficiency drops with age and parts become harder to source.
• You are facing repeated repairs: If costs are mounting, you may be throwing good money after bad.
• Energy bills keep rising: Older boilers can be 60 to 70 percent efficient compared to 90 percent or more for modern condensing boilers.
• Parts are obsolete: Some manufacturers have discontinued spares, making repairs impossible.
• You need a major component: Heat exchanger or PCB replacement on an old boiler is often not cost effective.

Still unsure? Read our honest guide: Repair or replace? An engineer’s guide.

Types of Boiler

Type	Best For	Pros	Cons
Combi	Flats, small to medium homes, one bathroom	No tank needed, instant hot water, space saving	Can struggle with multiple outlets at once
System	Larger homes, two or more bathrooms	Good pressure to multiple outlets, works with cylinder	Needs hot water cylinder (takes space)
Regular	Older properties with existing tank systems	Works with existing setup, good for high demand	Needs tank and cylinder, less efficient

Most London homes suit a combi boiler because they are compact, efficient, and provide hot water on demand. If you have a larger home or multiple bathrooms, a system boiler with a cylinder may be better.

Choosing the right size: Boiler size depends on hot water demand, number of bathrooms, insulation, and radiator capacity. We confirm the correct specification during the survey.

More detail: Combi boiler vs hot water tank: which is right for your home?

What Affects the Quote for a New Boiler?

Factor	Impact
Boiler type and brand	Premium brands cost more but often last longer
Boiler size (kW output)	Larger homes need more powerful boilers
Location change	Moving the boiler adds pipework and labour
Flue routing	Longer or complex flue runs increase cost
System upgrades	New controls, valves, or pipework add cost but improve efficiency
Power flush	Recommended before fitting to protect your new boiler
Gas pipe upgrade	Some older properties need a larger gas supply

We provide a fixed quote after surveying your property. No hidden costs, no surprises.

In writing: You receive a clear scope of works, what is included, and what is not included, before you agree to anything.

Boiler Brands We Install

We install all major brands. These are the ones we most often recommend:

Brand	Why We Recommend It	Warranty
Worcester Bosch	Excellent reliability, widely available parts, strong UK support	Extended warranties available
Vaillant	High quality, efficient, popular with installers	Extended warranties available
Viessmann	Premium German engineering, very quiet operation	Extended warranties available
Ideal	Good value, reliable, UK made	Extended warranties available
Baxi	Solid mid range option, good parts availability	Extended warranties available

Warranty terms depend on the model and installer accreditation. We recommend the best option for your home, budget, and hot water demands.

Read our comparison: Vaillant vs Worcester Bosch.

Full guide: The ultimate buyer’s guide to choosing a new boiler.

Controls and Thermostats

We normally recommend a modern thermostat and proper system control setup because it improves comfort and can reduce gas usage. Options include programmable thermostats, smart controls, and zoned heating for larger properties.

What Happens During Installation?

1. Survey: We visit your property, assess your needs, and provide a fixed quote.
2. Scheduling: We book a date that works for you.
3. Removal: Old boiler disconnected and removed safely.
4. Pipework: Any necessary modifications to gas, water, or heating pipes.
5. Installation: New boiler mounted, connected, and commissioned.
6. Testing: Full system test, combustion analysis, and safety checks.
7. Registration: Warranty registered and compliance notification submitted.
8. Handover: We show you how to use your new boiler and controls.

How Long Does Installation Take?

Most straightforward boiler swaps (same position, same type) take one day. Complex installations involving relocation, system changes, or extensive pipework may take two days.

We confirm the expected duration when we provide your quote.

Before Installation Day

1. Clear the area around your existing boiler.
2. Ensure parking is available nearby for our van.
3. Let us know if access is restricted (flats, gated properties).
4. Make sure someone over 18 is home for the duration.
5. Move any valuables away from the work area.

Installing in Victorian or Period Properties

London has many older properties with unique challenges:

• Ageing pipework that may need upgrading
• Older radiators that may need replacing or balancing
• Limited space for modern boilers
• Flue routing through thick walls
• Listed building restrictions

If your property is listed or in a conservation area, flue positioning and external changes may be restricted. We advise during the survey.

We have extensive experience with London’s older housing stock. Read: The Victorian homeowner’s dilemma.

Renting? Landlords: Check This

Landlords: A reliable boiler is essential for tenant satisfaction and legal compliance. A new, efficient boiler can also improve your property’s EPC rating.

After installation, remember you will need an annual Gas Safety Certificate. Read our landlord checklist for full compliance requirements.

London Wide Coverage

We install boilers across all London boroughs and surrounding areas.

Warranty and Aftercare

All our installations include:

• Manufacturer warranty (term depends on model and installer accreditation)
• Building Regulations compliance notification (where applicable)
• Benchmark commissioning checklist completed
• User demonstration and documentation

We recommend annual boiler servicing to maintain your warranty and keep your boiler running efficiently.

New Boiler FAQs

How long will a new boiler last?
A quality boiler from a reputable brand, properly installed and serviced annually, should last 12 to 15 years or more. Some last over 20 years with good maintenance.

Do I need to upgrade my radiators?
Not always. If your radiators are in good condition and adequately sized, they can stay. We advise during the survey if any need replacing or if a power flush would help.

Can you move my boiler to a different location?
Yes. We regularly relocate boilers to cupboards, utility rooms, lofts, and garages. This adds to the cost but may be worthwhile for space or aesthetic reasons.

Will I lose heating during installation?
Yes, but only for the day of installation. We aim to have your new boiler up and running before we leave.

What happens to my old boiler?
We remove and dispose of it safely as part of the installation. This is included in your quote.

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