New Boiler Installation & Replacement in Brentwood — Specified Properly, Not Just Swapped
Brentwood homes are, on average, bigger and more expensive than almost anywhere else we work — and a bigger house makes a boiler installation a specification job, not a swap. Two or three bathrooms, an extension or loft conversion added since the boiler went in, and hot water demand that a like-for-like replacement simply won't meet: getting these right on paper before anything is ordered is the difference between a boiler that performs for fifteen years and one you're apologising for every school morning.
- Heat loss calculation on every installation — sized for the house, not the badge
- Flow-rate advice for homes with two or more bathrooms
- Scale protection fitted as standard — Brentwood has the hardest water we cover
- Flue planning for conservation-area frontages done properly
- Gas Safe registered — registration verifiable online
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Continue on WhatsAppThat's how we quote in Brentwood. Every installation starts with a heat loss calculation on the house as it stands today — not the house it was when the old boiler was fitted — carried out by a Gas Safe registered engineer, with the specification and a fixed price confirmed in writing. For a straightforward swap we aim to have the new boiler installed and running within 72 hours of the survey, and we handle the Gas Safe notification and building regulations paperwork for you.
Survey to Switched On — Specified First, Then Fast
Speed matters, but in Brentwood the specification matters more — so we do the thinking up front. For a straightforward swap we still aim for a working new boiler within 72 hours of the survey; bigger jobs get an honest timescale in writing, not a vague one.
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Day 1 — WhatsApp us, survey booked around your day
Send us a photo of your current boiler and a few details on WhatsApp. If you're commuting from Shenfield or Brentwood into London, we can start from photos and book the survey for an early slot — you don't need to take a day off to get a written quote.
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Day 1–2 — Heat loss calculation, fixed quote in writing
At the survey we measure the house as it is now — bathrooms, extensions, real hot water demand — and you get a fixed written quote with the specification and warranty confirmed. Say yes and we order the boiler and book your installation date immediately.
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Day 2–3 — Installation day
A straightforward swap is typically done in a day: old boiler out, system flushed, new boiler in, filter and scale protection fitted, system commissioned and demonstrated. Larger or more complex systems get the time they need — agreed with you at the survey, not sprung on you on the day.
Two or Three Bathrooms? The Conversation Is Flow Rate, Not Boiler Size
The detached and executive homes around Shenfield, Hutton and Ingatestone are exactly where a combi disappoints — not because combis are bad, but because a combi's hot water is capped by what it can heat on demand. Run the en-suite and the family bathroom at once and the flow rate halves, whatever the number on the badge. For a household genuinely using two or more bathrooms, a system boiler with a properly sized unvented cylinder is usually the right answer: mains-pressure stored hot water, both showers at full flow, sized from a heat loss calculation and your household's real usage. We install and commission unvented cylinders ourselves — our engineers hold the G3 qualification that work legally requires on top of Gas Safe registration — so the whole system is specified, fitted and signed off by one firm.
We'll tell you which side of that line your house falls at the survey, in writing, with the reasoning — and because we install both types, we've no incentive to steer you either way. The cheapest quote in Brentwood is very often a like-for-like combi swap that leaves the actual problem — hot water performance — exactly where it was. We'd rather lose the job than fit the wrong boiler.
Extended or Loft-Converted? Your Boiler Was Sized for a Smaller House
Extensions and loft conversions are everywhere in Brentwood — and almost every one of them adds radiators, often a bathroom, and always heat load, while the boiler stays the same. The result is a system that never quite gets the house warm, or hot water that runs out mid-shower, and the owner blaming the boiler when the real issue is that it's now heating a house it was never sized for.
So when we survey an extended Brentwood property, the heat loss calculation is done on the house as it stands today — extension, loft rooms, extra bathroom and all. Sometimes the existing boiler size is genuinely still right and we'll say so; more often the replacement needs to be specified up, or the system type reconsidered altogether. Either way you get the answer with numbers behind it, not a guess based on what was there before.
Thirteen Conservation Areas — Flue Placement Done Properly
Brentwood borough has thirteen conservation areas — Blackmore, Brentwood Town Centre, Fryerning, Great Warley, Herongate, Highwood Hospital, Hutton Village, Ingatestone Village Centre, Ingatestone Station Area, South Weald, Thorndon Park, Warley Place and Weald Park — and the council also applies design guidance to extensions in Shenfield, Warley, Ingrave and South Weald. For a domestic boiler installation, the ones most likely to matter are Hutton Village, South Weald, Great Warley and Ingatestone Village Centre, where a new flue terminal on a period or prominent frontage is exactly the kind of detail that draws attention.
Replacing a boiler doesn't normally need planning permission, even in a conservation area — but where the boiler moves, or a new flue penetration would land on a visible frontage, we plan the termination so it exits discreetly, normally to the rear or side, and deal with the planning question properly rather than drilling first and hoping. We handle the building regulations notification either way, so the paperwork is done and traceable when you come to sell.
The Hardest Water We Cover — and It Hits Bigger Systems Hardest
Brentwood's water measures around 388–390 ppm across CM13, CM14 and CM15 — the hardest of any town we cover, harder than Chelmsford or Witham, and roughly 180 ppm above the UK average of 207. At that level scale isn't a risk, it's a schedule: an unprotected heat exchanger starts furring up from the first week.
It matters more in Brentwood than elsewhere because of the housing. In a larger home running an unvented cylinder, scale doesn't just attack the boiler — it builds on the cylinder coil too, and a scaled-up cylinder loses hot water performance progressively rather than failing outright. Showers get slowly worse over years, and most owners never connect it to the water. So on every Brentwood installation we fit scale protection and a magnetic filter as standard, after a full chemical flush and inhibitor dose — not as an upsell, but because at 390 ppm connecting a new system unprotected is setting it up to fail. It's a warranty issue too: manufacturers expect appropriate protection in very hard water areas, and we make sure your installation meets it.
Boiler Installation FAQs — Brentwood
Ready for a New Boiler in Brentwood?
Send us a photo of your current boiler on WhatsApp and we'll take it from there — fixed written quote without taking a day off work, a specification with numbers behind it, and most straightforward installations completed within 72 hours of survey.
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