Boiler Installation & Replacement Across West & North West London
New and replacement gas boilers, from heat loss survey through to Building Regulations notification, for homes in Harrow, Uxbridge, Twickenham, Watford, Ealing and North West London.
- Registered Gas Safe business 974833
- Insured and certified
- Guaranteed workmanship
- Same-day slots subject to availability
Covering the HA, UB, TW, WD, NW and W postcode areas. Gas Safe registered 974833, fully insured, workmanship guarantee on every repair and installation.
Get a quote
Leave your details and a short description of the fault. We will confirm availability and quote the work before an engineer sets off.
- Gas Safe 974833
- TrustATrader TT32961
- Fully insured
- No hidden costs
Choosing the right boiler starts with the house, not the brochure. A three-bedroom 1930s semi off Pinner Road behaves very differently from a converted flat near Kilburn High Road, and the mains flow rate at the kitchen tap decides whether a combi can actually deliver a decent shower. We survey the property, measure incoming flow and pressure, and size the appliance against the heat loss of the rooms it has to warm.
Every boiler installation replacement we carry out is notified to Building Control through Gas Safe, and you receive the compliance certificate alongside your manufacturer warranty registration. Because Home Utility covers heating, plumbing and electrical work, the smaller jobs that surround a swap, such as a new fused spur, a moved gas run or a condensate tie-in, get handled by the same team.
This page sits under our heating services. If the fault turns out to be something else, the same engineer can usually deal with it, because Home Utility covers heating, plumbing, electrical and appliance work under one roof.
When replacing beats repairing
- Parts for your model are obsolete or sitting on long lead times.
- The same component has failed twice within one heating season.
- Heat exchanger corrosion, internal leaks or persistent combustion faults on an ageing unit.
- A back boiler or floor-standing unit still serving the whole house.
- Hot water flow too weak for a second bathroom you have added.
- Gas bills climbing while the boiler runs constantly to hold temperature.
What a boiler installation replacement with Home Utility involves
- Room-by-room heat loss survey and measurement of mains flow rate.
- Gas supply pipe checked and upsized where the new appliance demands it.
- System cleaned and dosed with inhibitor, plus a magnetic filter fitted.
- Flue routed and terminated to the manufacturer’s stated clearance requirements.
- Controls commissioned, including timer, room thermostat and compensation where specified.
- Gas Safe registration, Building Control notification and warranty paperwork completed.
The order the work happens in
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Survey and specification
An engineer measures the property, checks the gas supply and incoming water, then looks at where the flue and condensate can legally run. You get options to weigh up rather than a single take-it-or-leave-it figure.
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Written quote and a date
The quote sets out the appliance, the controls, any pipework changes and the time needed on site. Once you are happy with it, we book a date and confirm what needs clearing beforehand.
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Installation day
Old appliance removed, system flushed, new unit hung and connected, flue sealed and tested. Floors and furniture are covered, and water and gas stay off for the shortest window we can manage.
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Commissioning and handover
We run combustion checks, set the flow temperature so the boiler actually condenses, balance the radiators and walk you through the controls. Certificates and warranty registration follow, with our workmanship guarantee on the labour.
Sizing, Boiler Plus and what a compliant swap really requires
The most common mistake in a replacement is simply matching the old boiler’s output. Insulation, glazing and room use all change over decades, and an oversized combi short-cycles, which wastes gas and wears out ignition components. Space heating output should follow a heat loss calculation, while hot water performance is limited by the flow rate available at the incoming main. If the main delivers only ten litres per minute, a 35kW combi cannot produce more than ten litres per minute, and a system boiler with a cylinder is usually the better answer for a busy family bathroom. Since Boiler Plus came into force in England in 2018, a new gas boiler must meet a minimum seasonal efficiency and be fitted with time and temperature control. A combi needs one further measure on top: flue gas heat recovery, weather compensation, load compensation, or smart controls offering automation and optimisation. Separately, BS 7593 covers cleaning the system and dosing it with inhibitor, which protects a new heat exchanger from magnetite already circulating. Gas work must be carried out by a Gas Safe registered business, and the installation is notified to Building Control on your behalf. Replacing rather than repairing generally makes sense once an appliance sits beyond parts support or has suffered heat exchanger failure.
Where the line sits between you and an engineer
Removing or re-siting a gas appliance is never a homeowner job. It must be done by a Gas Safe registered engineer, and ours is registration 974833. You can help by clearing access to the boiler, the meter and the loft hatch before the date. Any electrical alterations that come with the install are carried out to BS 7671 and notified under Part P where required.
Why book this work with Home Utility
- Gas work carried out only by Gas Safe registered engineers
- Fully insured, with certification available on request
- Written quote first, work second, no costs added afterwards
- Urgent faults covered around the clock on the emergency line
- We stand behind the work with a workmanship guarantee
- One family-run company for heating, plumbing, electrics and appliances
Where our engineers attend
Engineers work across the HA, UB, TW, WD, NW and W postcode areas. These are some of the districts we attend most often, and the full list is on our areas we cover page.
Boiler Installation & Replacement booked around you
Ring 0203 8315999 to arrange a boiler installation replacement survey, and we will size the appliance to your home before anything is quoted.
Common questions
How long does a new boiler take to fit?
A like-for-like swap in the same position is usually a one-day job. Moving the appliance, converting from a regular system to a combi, or upgrading the gas run all add time, and a cylinder conversion can run into a second day. The survey establishes which of those applies, so the date in the diary reflects the actual work rather than an optimistic guess.
What affects the price of a new boiler?
Four things mainly: the appliance and its output, whether the flue or boiler position changes, the condition of existing pipework and gas supply, and the controls specified. A straightforward boiler installation replacement in the same cupboard sits well below one that moves upstairs and needs a fresh gas run. You receive an itemised quote after the survey, with nothing added afterwards.
Can I move the boiler into the loft or a cupboard?
Usually, provided there is a compliant flue route, a fall on the condensate to a suitable drain, safe access, boarding and lighting in a loft, and protection against freezing. Manufacturers set minimum clearances for servicing, and those come before convenience. A survey checks all of it, including whether the existing gas pipe can carry the appliance demand over a longer run.
Do I really need a flush and a magnetic filter?
In almost every case, yes. An existing system holds magnetite that will migrate straight into the new heat exchanger and block its narrowest waterways within a season. BS 7593 sets out cleaning and inhibitor dosing for domestic heating systems, and most manufacturers make their warranty conditional on it. The filter then catches whatever keeps circulating, and gets emptied each time the boiler is serviced.
Is Home Utility fully insured and qualified?
Yes. Home Utility Ltd employs qualified, certified engineers who are fully insured and background checked, and the company is a Gas Safe registered business under registration 974833. Insurance is also independently recorded on the company TrustATrader profile, membership number TT32961. Certification can be shown before work starts if you would like to see it.
How does Home Utility handle pricing?
You receive a clear quote before any work begins, so you can decide whether to go ahead before an engineer starts. Nothing is added afterwards. Where a diagnosis is needed first, the engineer explains what has been found and what putting it right involves, and you approve that work before it is carried out.
Home Utility Ltd is registered in England, company number 16892846, at 5th Floor, 167-169 Great Portland Street, London W1W 5PF. VAT 518 1609 94. Gas Safe registered business 974833. Work falling under gas or electrical regulation is carried out solely by qualified, registered engineers.