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Serdiuk Plumbing Solutions

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Boiler Installation & Replacement · Cork

Boiler Installation & Replacement in Cork

If your boiler is on its last legs — or you just want lower bills and better hot water — we'll fit the right one properly. You deal directly with a local Cork plumber and heating engineer, get honest advice and a clear written quote, and we handle everything from removing the old boiler to commissioning the new one and showing you how it works.

Request free boiler quote Call 083 808 8656
Oil boilers Gas boilers Boiler replacements Heating upgrades Cork city & county
New boiler installation in Cork with a magnetic system filter and clean copper pipework
Local Cork business
Oil & gas specialists
Fully insured
Free written quotes
Warranty support
Sound familiar?

Signs your boiler is on the way out

A boiler rarely fails overnight — it usually warns you first. If a few of these sound like your home, it's often the point where a new boiler makes more sense than another repair bill.

  • Heating bills creeping up every winter
  • Lukewarm or slow hot water
  • Banging, gurgling or kettling noises
  • Leaks or damp around the boiler
  • Cold spots and rooms that never warm up
  • Pressure dropping and needing topped up
  • One repair after another
  • A boiler that's well past 12–15 years old

Here's the honest maths most people don't get told: once a boiler is into its later years, repairs tend to come in clusters — a part this winter, another the next — and each call-out chips away at what you'd have spent replacing it. An older boiler is also burning more fuel for the same heat, so you're paying twice: once for the repairs, and again on every bill. There's no hard sell here — sometimes a repair genuinely is the right call, and we'll tell you so. But if you're throwing good money after an ageing unit, a new, efficient boiler usually works out cheaper over the few years you'd have kept patching the old one.

Repair or replace? Send us a photo of your boiler and a rough idea of its age, and we'll give you a straight answer on whether it's worth fixing or replacing — before you spend a cent.

What you actually get

Why homeowners upgrade their boiler

It's not about the boiler — it's about a home that's warm when you want it and cheaper to run. Here's what a new system really gives you.

Lower running costs

A modern condensing boiler wastes far less fuel than an old one, so more of what you pay for turns into heat instead of going up the flue.

Reliable warmth

No more crossing your fingers in January. A new boiler is built to keep going through a Cork winter without the breakdowns.

Better hot water

Stronger, steadier hot water for showers and taps, without the wait or the lukewarm surprise mid-shower.

Quieter at home

Modern boilers run quietly in the background instead of banging and humming through the house.

More space

Switching to a combi can free up the hot press and lose the old tank in the attic for good.

Modern controls

Set schedules and zones — even from your phone — so you only heat the rooms you're actually using.

Better BER & greener

A high-efficiency boiler cuts your carbon and can lift your home's BER — a genuine plus if you ever sell or rent.

How it works

Your boiler installation, step by step

No mystery and no guesswork — here's exactly how we take you from a tired old boiler to a warm, properly set-up heating system, and roughly what to expect at each stage.

1

Home visit & assessment

We look at your current boiler, radiators and hot-water setup and ask how you actually use your heating. It's where we spot anything that affects the job — pipework, the flue route, where the condensate runs. Usually 30–45 minutes.

2

Sizing the system

We work out the right output from the home itself — its size, rooms and hot-water demand — not a guess. Too big and it short-cycles and wastes fuel; too small and it can't keep up. This step is what keeps your bills down for years.

3

Choosing the boiler

We talk you through combi, system or regular and recommend the genuine best fit for your home and budget, in plain terms. No pushing the dearest model.

4

Clear written quote

One fixed, written price covering everything — boiler, removal, controls, flush and clean-up — agreed before any work starts. No day-of surprises.

5

Removing the old boiler

On the day, we protect floors and work areas, drain the system down, safely disconnect the old unit and take it away for disposal. A straightforward swap is often done within a day.

6

Pipework & system changes

Any pipe alterations, a new flue and a magnetic filter go in neatly. If you're switching to a combi or moving the boiler, this is where that work happens.

7

Fitting the new boiler

The new boiler is mounted and connected to manufacturer spec — flue, condensate, gas or oil supply and controls all done properly and tidily.

8

Flush, inhibitor & balance

We clean or power-flush the system so old sludge can't wreck the new boiler, add inhibitor to protect it, then balance the radiators so every room heats evenly.

9

Commission, warranty & walkthrough

We pressure-test, commission the boiler to the correct settings, set up your thermostat and register the unit with the manufacturer so the warranty is in place. Before we leave, we show you how it all works.

Not sure which boiler you need?

Tell us about your home and we'll recommend the right system and send a clear, written quote — no pressure, no jargon.

Get honest advice on WhatsApp Call 083 808 8656
Which one suits your home?

Types of boiler we install

There's no single "best" boiler — only the right one for your house, your hot-water demand and your fuel. Here's the plain-English version of each.

Combi boilers

Heat and hot water on demand from one compact unit — no tank or cylinder, and instant hot water.

Best for: smaller homes & apartments with one bathroom.

Worth knowing: flow can dip if two showers run at once.

System boilers

Work with a hot water cylinder to deliver strong hot water to several taps at the same time.

Best for: busier family homes with two or more bathrooms.

Worth knowing: needs space for a cylinder.

Regular boilers

The traditional tank-and-cylinder setup, and often the simplest swap for homes already plumbed that way.

Best for: older Cork homes or low mains pressure.

Worth knowing: takes the most space — tank and cylinder.

Oil boilers

The norm across Cork county where there's no gas line. We replace and upgrade oil boilers, indoor and external.

Best for: rural homes off the gas network.

Worth knowing: needs an oil tank and annual servicing.

Gas boilers

Efficient, compact and quiet — for homes on the natural gas network in the city and larger towns.

Best for: homes with a mains gas connection.

Worth knowing: only an option where gas is available.

Not sure? We'll advise

Tell us your home and how you use hot water, and we'll point you to the option that genuinely fits — not the dearest one.

Best for: anyone who wants honest, no-pressure advice first.

No surprises

What's included in your installation

Everything is set out in your written quote, so you know exactly what you're paying for. A typical boiler installation includes:

  • Old boiler removal & disposal — we take the old unit away, so there's nothing for you to arrange.
  • New boiler supply & fit — installed to manufacturer specification, gas or oil.
  • Flue & pipework alterations — adjusted neatly to suit the new unit.
  • Magnetic system filter — catches sludge and debris so it can't damage the new boiler.
  • System flush or power flush — clears the muck out of an older system before the new boiler goes on.
  • System inhibitor — added to protect against rust and fresh sludge building up.
  • Heating controls / thermostat — set up so you can schedule and zone your heating.
  • System balancing — radiators adjusted so every room heats evenly.
  • Pressure-testing & commissioning — everything checked and set to run safely and efficiently.
  • Manufacturer warranty registration — we register the boiler so your warranty is valid from day one.
  • Clean-up & waste removal — we leave your home as we found it.
Done once, done right

Why a proper installation matters

Two boilers of the same make can perform completely differently depending on how they're fitted. This is the part that decides whether yours runs efficiently for years — or causes grief.

Sizing. An oversized boiler short-cycles — firing up and shutting off constantly — which burns more fuel and wears parts faster; an undersized one can't keep up on a cold morning. We size the boiler to the home rather than just swapping like-for-like out of habit, so it runs in its efficient range.

Water quality & flushing. In a lot of Cork homes we open up an old system and find it full of sludge — that black, gritty water is the number-one killer of new boilers. We flush or power-flush the system, add inhibitor and fit a magnetic filter, so your new boiler isn't pumping old debris through its heat exchanger from day one.

Pressure-testing & commissioning. Once it's in, we pressure-test the system and commission the boiler to the correct settings — getting the gas or oil rate right is what makes it run cleanly and efficiently rather than guzzling fuel. Skipping this is how you end up with a brand-new boiler that still costs a fortune to run.

Warranty. Manufacturer warranties depend on the boiler being installed and commissioned correctly, and serviced each year afterwards. A proper installation isn't just about today's heat — it's what keeps you covered for years. If a fault ever does crop up, you've the same local team for boiler servicing and emergency call-outs, plus ongoing plumbing maintenance if you need it.

Worth knowing: most early boiler failures come from a dirty system, not the boiler itself. A flush, an inhibitor and a magnetic filter at installation is one of the cheapest ways to protect an expensive new unit.

Clean copper pipework and a pump fitted during a heating installation in Cork

Clean pipework

Tidy copper work and a filter to keep the system healthy.

New hot water cylinder installed in a Cork home for stronger hot water

Hot water cylinders

Cylinder upgrades for stronger, steadier hot water.

Thermal imaging check of a heating system in Cork to find cold spots

System checks

Balancing and checks so every room heats evenly.

While we're at it

Heating improvements worth considering

A boiler swap is the ideal time to sort the rest of the system — only where it genuinely helps. Common upgrades Cork homeowners ask us about:

Radiators, TRVs & controls

New radiators where old ones are cold at the bottom, thermostatic valves (TRVs) on each so you can set room-by-room temperatures, and proper programmable controls.

Smart thermostats & zones

Heat only the rooms you use, when you use them, with heating zones and weather compensation that trims the boiler back on milder days — all controllable from your phone.

Power flushing, filters & cylinders

A power flush and magnetic filter to clear and protect a sludged system, or a new hot water cylinder for stronger, steadier hot water.

Planning an extension or a new home? We also handle full first and second-fix heating and plumbing for new builds, and we fit heating and pipework as part of complete bathroom renovations. We'll only ever suggest an upgrade where it'll make a real difference to your comfort or your bills.

Recent work

Recent heating & boiler work in Cork

A few examples of recent boiler and heating jobs around Cork. See more of our recent work here.

New boiler installation with magnetic filter in Cork
New Boiler Installation — CorkWall-hung boiler fitted with a magnetic filter and tidy copper pipework.
Hot water cylinder installation in a Cork home
Hot Water Cylinder Installation — CorkNew cylinder for stronger, more reliable hot water.
Copper pipework and shower pump installation in Cork
Pipework & Pressure — CorkNeat copper pipework and a pump to boost weak pressure.
Underfloor heating installation in a Cork home
Underfloor Heating Installation — CorkUnderfloor loops laid and pressure-tested before flooring.
Heating system balancing and thermal check in Cork
Heating System Balancing — CorkThermal checks to find cold spots and balance the system.

More boiler and heating photos are added as jobs are completed.

Where we work

Boiler installation across Cork

Based in Carrigaline, we install and replace boilers right across Cork City and County — gas in the city and larger towns, oil out in the county where there's no gas line. Being local means a quick response and someone who knows the area, not a national outfit sending whoever's nearest. If your town isn't listed below, you're still very welcome to get in touch — we likely cover you.

Cork CityDouglasBallincollig CarrigalineMidletonCobh BlarneyGlanmireMallow Little IslandBishopstownRochestown BlackrockPassage WestCrosshaven Kinsale
Good to know

Boiler installation FAQs

How much does a new boiler cost in Cork?
It depends on the type of boiler, your home and whether any pipework or fuel changes are needed — so we price each job after seeing it. You'll get a clear written quote with no hidden extras, and the quote itself is free.
Should I repair or replace my boiler?
If your boiler is relatively young and it's a one-off fault, a repair usually makes sense. But once a boiler is older and needing repairs regularly, those bills mount up — and a new, efficient boiler often works out cheaper over time. We'll give you the honest answer either way.
How long does a boiler installation take?
A straightforward like-for-like swap is often done in a day. Jobs that involve moving the boiler, changing fuel type or upgrading the system can take longer — we'll tell you exactly what to expect with your quote.
Will I be left without heating or hot water?
Usually only for the part of the day we're actually swapping the boiler. We plan the work to keep any downtime short and let you know in advance what to expect.
Can I stay in the house during the installation?
Yes, you're grand to stay — there's no need to move out. Heating and hot water are just off for the part of the day we're doing the changeover, and we keep the work area clean and contained.
What size boiler do I need?
The right size comes from the home itself — its size, number of rooms, insulation and hot-water demand — not a rule of thumb. We work it out at the assessment so the boiler isn't oversized (wasting fuel) or undersized (struggling on cold days).
Do I need new pipework?
Not always. A like-for-like replacement can often reuse much of the existing pipework. You'll need some changes if you're moving the boiler, switching to a combi, or upgrading an older system.
Can I move my boiler to a different spot?
Usually yes — though it adds pipework, flue and condensate runs to the job, so it costs a bit more. We'll set it all out clearly in the quote before anything starts.
Can you replace an oil boiler, or switch fuel type?
Yes. Oil boilers are very common across Cork county and we replace and upgrade them regularly. Switching between fuel types is possible too, depending on what's available at your home — we'll talk you through the options.
Can I install a combi boiler?
In most homes, yes — a combi frees up the tank and cylinder space and gives instant hot water. We'll check your mains water pressure and how much hot water you use first, since a very busy household with several bathrooms may be better on a system boiler.
Can I keep my existing radiators?
In most cases, yes. We check they're sound, balance the system and give it a clean so the radiators heat properly. We'll flag it honestly if any are past their best.
Which boiler is best for my home?
It comes down to your home's size, how many bathrooms you have and your hot-water demand. A combi suits smaller homes, a system boiler suits busier family homes, and a regular boiler often suits older homes already set up that way. We'll recommend the right fit, not the dearest.
How efficient are new boilers?
Modern condensing boilers are far more efficient than units from 10–15 years ago, so more of your fuel turns into heat instead of going up the flue. Paired with a clean system and good controls, that can noticeably reduce waste.
Will a new boiler lower my heating bills?
A more efficient boiler and a properly balanced system reduce wasted energy, which usually shows up on your bills. The exact saving depends on your home, your old boiler and how you heat the house.
Do I need a power flush?
If your system is older or full of sludge, usually yes — a power flush clears the debris so the new boiler runs efficiently and lasts. If the system's clean, a standard flush may be enough. We'll tell you honestly which yours needs.
Should I fit a magnetic filter?
Yes — it's one of the cheapest ways to protect a new boiler, catching sludge and metal debris before they reach the heat exchanger. We fit one as standard on every installation.
Do you flush the system when fitting a new boiler?
Yes. We clean or flush the system and add inhibitor and a filter so old sludge can't damage the new boiler. It's one of the most important steps for protecting your investment.
Do you remove and dispose of the old boiler?
Yes — taking the old boiler away and disposing of it is included, so you've nothing to arrange yourself.
How long do boilers last?
With regular servicing, most boilers last in the region of 10–15 years. Water quality, system cleanliness and how hard it works all play a part.
How often should a boiler be serviced?
Once a year. An annual boiler service keeps it running efficiently and safely, and it's usually what keeps the manufacturer's warranty valid.
Do you register the warranty?
Yes — we register your new boiler with the manufacturer so the warranty is in place. Keeping up with annual servicing is what keeps that warranty active.
Can you fit a smart thermostat or heating controls?
Yes. Good controls and zoning are one of the easiest ways to cut waste and improve comfort, letting you heat only the rooms you're using, when you're using them. We'll show you how to use them before we leave.
Will a new boiler add value to my home?
A modern, efficient boiler and a better BER are a genuine plus for buyers and renters — it's one less big-ticket job for them to worry about, and lower running costs are an easy selling point.
Are there SEAI grants for a new boiler?
SEAI grants are aimed mainly at heat pumps and insulation rather than a like-for-like boiler swap, so a straight replacement usually won't qualify. It's worth checking the SEAI site for your own situation, and we're happy to talk through what might apply.
Can I finance a new boiler?
We don't offer finance directly, but a clear written quote makes it straightforward to arrange your own funding if you'd like to spread the cost.
What happens if my boiler breaks down before I replace it?
We can help — we cover emergency plumbing and heating call-outs across Cork, and we'll give you a straight answer on whether it's worth repairing or replacing.
Do you service the boiler after installation?
Yes. We offer annual boiler servicing to keep it running efficiently, safely and within warranty — and we're a phone call away if anything ever needs looking at.
Do you do other plumbing work too?
We do — from bathroom renovations to general plumbing maintenance and new build plumbing. Handy if you want one trusted local tradesperson for the lot.
What areas of Cork do you cover?
We're based in Carrigaline and cover Cork city and county, including Douglas, Ballincollig, Midleton, Cobh, Glanmire, Blackrock and the surrounding towns. If you're nearby and not listed, just ask.
How do I get a quote?
Give us a call or send a message on WhatsApp — a photo of your current boiler helps. We'll arrange a visit if needed and put together a free, written quote with no obligation.
Peace of mind

Why homeowners choose Serdiuk Plumbing

Fitting a boiler is a big spend and you're letting someone into your home. Here's what you get when that someone is us.

Local Cork engineer

You deal directly with the person doing the work — not a call centre or a subcontractor you've never met.

Clear written quotations

A fixed price in writing before we start, so you know exactly what you're paying and what's included.

Clean, tidy workmanship

Floors protected, mess cleared and waste taken away — your home left as we found it.

Direct communication

Straight answers by phone or WhatsApp, and we turn up when we say we will.

Respect for your home

We treat your house like our own and work around your day where we can.

Honest recommendations

If a repair makes more sense than a replacement, we'll tell you — even if it means a smaller job.

Aftercare & servicing

We're here after the job for servicing and anything that needs looking at down the line.

Fully insured

Properly covered for the work we carry out, for your peace of mind.

No hard selling

Advice first. We give you the facts and the decision is always yours, in your own time.

Honest advice from a local Cork heating engineer

A warmer home and lower bills — sorted properly.

Whether your boiler has finally given up or you just want better hot water and cheaper running costs, you'll get straight advice, the right boiler for your home, and a clear written quote. No pressure, no jargon, no surprises — just a job done right by someone local.

Request a free boiler quote Call 083 808 8656

Free quotes · No obligation · Cork city & county · Oil & gas boilers