Immersion repair and replacement · Ireland
Immersion Heater Ireland: Replacement, Repair and Cost
A worn element, a failed thermostat or a full new immersion, with county-by-county guidance on what it costs, how off-peak timers cut running costs, and how to find a plumber for the job.
How they work
Immersion Heaters in Ireland: How They Work and When to Replace
An immersion heater is an electric element inside your hot water cylinder that heats the water directly, used as the main water heater or as backup when the boiler is off. The plumbing side, draining the cylinder, fitting the new element or thermostat and refilling, is done by a plumber, while the final electrical connection to a new unit should be made by a registered electrician on the Safe Electric (RECI) register.
How Long Does an Immersion Replacement Take?
An element or thermostat swap takes an hour or two once the cylinder is drained. A new immersion or a dual and timer upgrade is a half-day job.
Cut Running Costs With Off-Peak Heating
Pairing an immersion with a timer lets it heat on cheaper night-rate electricity, filling the tank overnight for use the next day.
Local coverage
Immersion Heater Services by County Throughout Ireland
Immersion work is never one-size-fits-all. What you pay, whether your home runs the immersion as backup or as the main water heater, and how fast a plumber can reach you all come down to where in Ireland you live. Choose your county for 2026 pricing that reflects real local costs, the off-peak and dual immersion options that actually apply to your area, and plumbers working on your doorstep.
Leinster
12 countiesMost Leinster homes keep a hot water cylinder with an immersion heater, from Dublin’s older terraces to the newer estates across Meath, Kildare and Wicklow. Element and thermostat replacements are the jobs plumbers see most, along with timer and dual immersion upgrades that shift water heating onto cheaper night-rate electricity.
Munster
6 countiesCork and Limerick homes lean on the immersion for hot water whenever the boiler is off, and rural Munster homes on oil use it as the summer water heater. Element replacements and off-peak timer setups make up much of the work, with dual immersion upgrades popular in larger houses.
Connacht
5 countiesAcross Galway, Mayo and the west, the immersion heater is the everyday hot water source in many one-off rural homes. Hard-working elements and hard water mean regular replacements, and pairing an immersion with a timer to run on night-rate electricity is a common money-saving upgrade.
Ulster
3 countiesCavan, Monaghan and Donegal homes lean on the immersion through long northern winters, both as backup to an oil boiler and as the main summer water heater. Element and thermostat replacements are steady work, with timer and off-peak setups cutting running costs.
Browse plumbers in any county in the full plumber directory.
The options
Immersion Heater Options: Which Job Does Your Cylinder Need?
Immersion Element Replacement
The most common immersion job. A worn or scaled element is drained down, swapped out and the cylinder refilled, restoring fast, reliable hot water. Supply and fit.
New Immersion Installation
Fitting an immersion to a cylinder that has none, or replacing an old unit and its thermostat in full. Ideal as backup water heating or a summer standalone. Supply and fit.
Dual Immersion & Timer
A top element for a quick boost and a bottom element for a full tank, wired to a timer so the cylinder fills on cheaper night-rate electricity. The best setup for running costs.
2026 prices
Immersion Heater Cost Ireland 2026: Typical Prices by Job Type
Typical ranges for immersion work. All figures include labour and VAT at 9%.
Immersion element replacement
€120–€250
Supply and fit, cylinder drained and refilled
New immersion installation
€200–€450
Supply and fit, new element and thermostat
Thermostat replacement
€80–€160
Swap only, restores accurate temperature control
Timer / off-peak wiring
€120–€250
Sets the immersion to heat on night-rate electricity
Dual immersion upgrade
€300–€550
Top and bottom elements for boost and full tank
For a full breakdown see our Ireland plumbing costs guide.
Running costs
Cut Hot Water Costs With an Off-Peak Timer
Night-rate and smart tariffs price overnight electricity well below the day rate. Wire the immersion to a timer and the cylinder fills while units are cheapest, giving you a full tank for the morning. Pairing a dual immersion with a timer, the bottom element on overnight and the top for a quick daytime boost, is the most cost-effective hot water setup for most Irish homes.
Find a plumber near you →Hiring
How to Find a Plumber for Immersion Work in Ireland
The plumbing side of immersion work is done by a plumber, with the final electrical connection to a new unit made by a registered electrician. Here is how to hire correctly.
Browse Plumbers in Your County
Browse plumbers by county in our full plumber directory. Find plumbers near you who handle immersion elements, thermostats and timer setups, and contact them directly. No fees and no sign-up to get in touch.
Get a Clear Quote for the Work
A good quote names the element and thermostat rating, the labour to drain and refill the cylinder, and whether a timer or fresh wiring is included. Ask whether the plumber arranges the electrical connection or whether you need to book an electrician separately.
Confirm the Final Electrical Connection
The plumbing is done by a plumber, but the final electrical connection to a new immersion should be made by a registered electrician on the Safe Electric (RECI) register. For a like-for-like element swap on existing wiring, most plumbers complete the job in one visit.
Check the Element and Thermostat Rating
In hard-water areas an Incoloy element resists scale far better than a standard copper one and lasts longer. Confirm the thermostat is set to 60 to 65 degrees, hot enough to kill bacteria without wasting electricity or scalding.
Immersion Heater Questions From Irish Homeowners
How much does it cost to replace an immersion element in Ireland in 2026?
An immersion element replacement costs €120 to €250 in 2026, including labour and VAT at 9%. The cylinder has to be drained and refilled, which is where most of the time goes. A thermostat swap on its own is €80 to €160.
Why does my immersion keep tripping or stop heating the water?
The usual causes are a burnt-out element, a failed thermostat, or a build-up of limescale that makes the element overheat and trip the switch. A plumber tests the element and thermostat, and if the element is scaled or open-circuit it is replaced rather than repaired.
What is the difference between a single and a dual immersion heater?
A single immersion has one element that heats the whole cylinder. A dual immersion has two: a top element for a quick boost of hot water and a bottom element for a full tank. Dual immersions suit larger homes and pair well with a night-rate timer.
Can I fit a timer so the immersion runs on night-rate electricity?
Yes. A timer set to a night-rate or smart tariff heats the cylinder overnight on cheaper units, giving you a full tank for the morning. Timer and off-peak wiring costs €120 to €250, and it is one of the quickest ways to cut hot water running costs.
Do I need an electrician as well as a plumber for immersion work?
For a like-for-like element or thermostat swap on existing wiring, a plumber usually completes the job. For a brand-new immersion, new circuit or timer wiring, the final electrical connection should be made by a registered electrician on the Safe Electric (RECI) register.
How long does an immersion heater replacement take?
An element or thermostat swap takes an hour or two once the cylinder is drained. A full new immersion, or a dual immersion and timer upgrade, is a half-day job. Draining and refilling the cylinder is the slowest part on any immersion job.
Find a Plumber for Immersion Work Near You
Immersion element, thermostat, dual immersion and timer work from plumbers in every county. Contact them directly, no fees, no sign-up.