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Scarlet Heating & Plumbing

Heating & boilers

A new boiler, sized foryour house

Not for the catalogue, and not for whatever the last engineer happened to have on the van. We measure your water supply, count your outlets and specify from there — then fit it tidily and register the warranty for you.
Guide price
From £1,850 fitted
Typical job
One day for a swap
Warranty
Up to 10 years, registered
Book a free surveySize my boiler
Newly installed combi boiler with neat copper pipework and a magnetic system filter

Before you ring anyone

Work out roughly what you need

Four questions. It will tell you the likely boiler type, an output range and a realistic price band — including when the honest answer is that a combi is the wrong choice for your house.
1How many bedrooms?

A proxy for how many people are drawing hot water.

2How many bathrooms?

This is the single biggest factor in boiler sizing.

3What have you got now?

It sets how much pipework has to change.

4How is your cold mains pressure?

Run the kitchen cold tap full bore — that is your incoming supply.

Your indicative result

0 of 4 answered

Answer the four questions and we will suggest a boiler type, an output range and a realistic price band for your situation.

This is a guide, not a quote. Correct sizing needs a measured mains flow rate and a look at the flue route — which is exactly what the free survey is for.

What the price covers

Everything on the quote, nothing after it

The commonest complaint about boiler installers is the bill that arrives bigger than the quote. Here is exactly what our number includes.
  • The boiler, supplied and fitted, with the flue and terminal
  • Removal and disposal of the old boiler, cylinder or tanks
  • System cleanse and inhibitor dosing before the new boiler goes on
  • Magnetic system filter fitted as standard, not as an upsell
  • New controls — programmer, room thermostat or smart, your choice
  • All pipework alterations, isolation valves and condensate run
  • Commissioning with recorded combustion readings
  • Building Regulations notification and Gas Safe certificate
  • Manufacturer warranty registered in your name
  • Everything cleaned up and taken away

Why we always fit a filter

Central heating systems corrode from the inside. The magnetite that comes off collects in the boiler’s heat exchanger, which is the most expensive part in there and the one most warranties argue about. A magnetic filter catches it before it gets that far. Most manufacturers now insist on one for the extended warranty anyway — we would fit it regardless.

When we will tell you not to bother

If your boiler is under eight years old and the fault is a £180 part, we will say so. We would rather do a small job today and be the people you ring in five years than sell you something you did not need.

1 day

Typical combi swap

10 yr

Warranties available

How the job runs

From first phone call to registered warranty

Six stages. You will know which one you are at, every time.
  1. 01

    Free survey, properly done

    We measure the incoming mains flow rate, count the outlets, look at the flue route and check the gas run can carry the load. Twenty minutes that decides whether the boiler will actually perform.

  2. 02

    A fixed written quote

    One page, plain English: the boiler, the controls, the filter, the labour, the removal and the warranty. No day rates and no 'from' prices.

  3. 03

    Installation day

    Sheets down, water off, old unit out. Most swaps are done in a day. We power flush or chemically clean the system before the new boiler goes on it — always.

  4. 04

    Commissioning and handover

    Combustion tested and recorded, system balanced, controls set up on your phone if they are smart ones, and we show you how it all works before we pack up.

  5. 05

    Paperwork and registration

    Building Regulations notification, Gas Safe record and the manufacturer warranty registered in your name. You do not have to chase any of it.

  6. 06

    A year later

    We remind you when the first service is due, because missing it is the quickest way to void a ten-year warranty.

Boilers we fit

We are not tied to one manufacturer

Some installers only fit one brand because of the trade deal they are on. We fit and service all the major names, which means we can recommend on merit — your water supply, your property and how long you plan to stay.
  • Worcester Bosch
  • Vaillant
  • Ideal
  • Baxi
  • Glow-worm
  • Viessmann
  • Alpha

Brand names are the property of their respective owners and are listed to show what we work on, not to imply any endorsement or approved-installer status.

Budget, mid-range or premium

The cheapest boiler is rarely the cheapest over ten years. We will show you the difference in warranty length, parts availability and build quality, then leave the choice with you.

Warranty length depends on the install

Most long warranties are conditional on a system filter, a full cleanse and an annual service. We do all three as standard so the cover you paid for actually stands.

Parts you can still get in ten years

We steer away from models we know are a nuisance to source parts for. It matters more than the badge on the front.

Straight answers

New boiler questions

The things people actually want to know before spending a few thousand pounds.
All questions
How much does a new boiler cost in South Wales?
A like-for-like combi swap typically starts around £1,850 fitted, a conversion from a system or back boiler to a combi is usually £2,600 to £3,600, and a full system with new pipework and controls goes higher. The honest answer is that the price depends on the boiler, the flue route, the state of the existing pipework and whether you want a filter and controls — which is exactly why we survey before quoting rather than guessing.
How long does a boiler installation take?
A straight combi-for-combi swap is normally a single day. Converting from a conventional system with a tank and cylinder to a combi is usually one to two days, because there is more pipework to alter and the loft tanks to remove. We give you a realistic day count with the quote — not an optimistic one.
What size boiler do I need?
For most homes, boiler size is set by hot water demand rather than by the size of the house: roughly 24 to 27kW for a home with one bathroom, 28 to 32kW with two, and 35kW or more for larger properties with high simultaneous demand. Incoming mains flow rate matters just as much — a big combi on a weak supply performs badly. We measure the flow rate on site before recommending anything.
Which boiler brands do you fit?
We fit and service all the major brands including Worcester Bosch, Vaillant, Ideal, Baxi and Glow-worm. Rather than push one manufacturer, we match the boiler to your property, your water supply and how long you plan to stay — then register the warranty for you so it is active from day one.
Is the price you quote the price I pay?
Yes. Installation and bathroom quotes are fixed and written down, including the boiler, materials, labour, removal of the old unit and commissioning. The only thing that changes the price is you changing the scope, or something genuinely hidden turning up behind a wall — and if that happens we stop, explain it and agree the cost with you before carrying on.
Should I repair my boiler or replace it?
As a rule of thumb, if the boiler is under eight years old and the part is available, repair it. If it is over twelve, has needed more than one repair recently, or the part is obsolete, the money is usually better spent on a replacement. We will tell you plainly which side of that line you are on, including when the answer means a smaller job for us.

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Get a fixed price for your new boiler

Free survey, written quote, no pressure. Or ring 07490 623966 and talk it through with an engineer first.

Book a free survey07490 623966
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