What does a hot water cylinder replacement cost in Ireland?
Source reviewed with 3 external references. How we review guides
A leaking or undersized hot-water cylinder is not always a like-for-like replacement. Irish homes use vented copper cylinders, direct and indirect cylinders, mains-pressure unvented systems and cylinders designed for heat pumps. The correct choice depends on the existing plumbing, heat source, water pressure, household demand and available space.
A September 2026 Irish plumbing guide publishes €600–€1,200 including labour and VAT for a copper cylinder supplied and fitted. Its indicative figures rise to €1,000–€2,000 for an unvented pressurised cylinder and €1,500–€2,500 for a heat-pump cylinder. These are one guide's market estimates, not fixed national rates or quotes for every property.[1]
This guide helps you identify the job, compare complete fitted prices and avoid replacing the whole cylinder when an immersion element or thermostat may be the actual fault.
Published Irish hot-water cylinder estimates checked October 2026
| Job | Indicative fitted cost |
|---|---|
| Vented copper cylinderSupply and fit estimate including labour and VAT for a like-for-like vented replacement. | €600–€1,200[1] |
| Indirect cylinderGuide describes a boiler coil with immersion backup. | €650–€1,300[1] |
| Unvented pressurised cylinderExtra controls and a safe discharge arrangement affect the scope. | €1,000–€2,000[1] |
| Heat-pump cylinderGuide estimate for a 200–300 litre unvented heat-pump cylinder. | €1,500–€2,500[1] |
| Immersion element replacementRepair estimate rather than complete cylinder replacement. | €150–€300[1] |
Prices are typical 2026 estimates and vary by job, condition and location.
Identify the cylinder and the real fault first
A traditional vented cylinder is normally fed from a cold-water tank in the attic. An indirect cylinder is heated through a boiler coil, while a direct cylinder relies on immersion elements. An unvented cylinder takes its cold supply from the mains and needs pressure and temperature safety controls. Photograph the cylinder label, visible pipes and controls without removing covers, and tell the plumber how the home currently heats water.[1]
- Water leaking from the cylinder body can indicate that the vessel itself needs replacement.
- No hot water may be caused by an immersion element, thermostat, timer, electrical supply or boiler-side fault.
- Running out of hot water may mean the cylinder is undersized or not being heated correctly.
- Low pressure can be a feature of the existing vented system rather than a failed cylinder.
Ask for diagnosis and replacement as separate line items when the cause is uncertain. A published estimate of €150–€300 for an immersion element is materially different from replacing the full cylinder, but an electrician or plumber still needs to assess the actual fault and installation.[1]
Why heat-pump and unvented cylinders cost more
An unvented system is not simply a copper cylinder with stronger pressure. It needs suitable incoming flow, safety controls and a compliant discharge route. Ask who will commission it and what maintenance the manufacturer requires. Changing from a vented to an unvented arrangement can also affect other plumbing and should be surveyed before a final price is given.
SEAI says an air-source heat-pump design includes deciding where to locate the hot-water cylinder. Its technical specification says a heat-pump cylinder must meet the manufacturer's requirements, including heat-exchanger size and insulation. A heat-pump upgrade therefore needs coordinated system design; do not order a cylinder from its litre capacity alone.[2][3]
What a complete written quote should include
- Cylinder manufacturer, model, material, capacity and whether it is direct, indirect, vented or unvented.
- Supply, delivery, labour, draining, reconnection, testing and commissioning.
- Immersion element, thermostat, valves, safety controls, insulation and any new pipework.
- Removal and lawful disposal of the old cylinder and who retains any scrap value.
- Electrical work, boiler alterations, carpentry or hot-press changes priced separately.
- VAT, warranty, expected loss of hot water and any provisional charge for hidden defects.
If a gas boiler or gas pipework must be altered, clarify which work will be handled by a Registered Gas Installer. If fixed electrical work is required, clarify who is responsible for electrical testing and certification. The main plumbing quote should name any work that is excluded rather than leaving it to be discovered on installation day.
A cylinder replacement request you can adapt
'Please assess and quote for a hot-water cylinder at a [house/apartment] in [town/county]. The current cylinder is approximately [capacity if visible], heated by [boiler/immersion/heat pump], and the problem is [leak/no hot water/insufficient capacity]. Please state whether repair is possible and quote replacement separately. Name the proposed cylinder, capacity and system type, and include controls, pipework, draining, testing, removal, disposal, VAT, warranty and any electrical or boiler work excluded. Photos of the label, cylinder and hot press are attached.'
Frequently asked questions
What does a hot-water cylinder replacement cost in Ireland?+
A September 2026 Irish plumbing guide estimates €600–€1,200 including labour and VAT for a vented copper cylinder supplied and fitted. It gives €1,000–€2,000 for an unvented cylinder and €1,500–€2,500 for a heat-pump cylinder. Obtain a property-specific quote.[1]
Could I replace only the immersion element?+
Possibly, if the cylinder is sound and the element is the fault. The same guide estimates €150–€300 for element replacement, but the system needs diagnosis before parts are ordered.[1]
Can I use my existing cylinder with a new heat pump?+
Only if the heat-pump designer confirms it meets the manufacturer's requirements. SEAI highlights cylinder location, heat-exchanger size and insulation as system-design considerations.[2][3]
Does the quote normally include taking away the old copper cylinder?+
Do not assume it does. Ask the plumber to state removal, disposal and treatment of any scrap value in writing.
Sources and editorial notes
Numbered references link claims in this guide to the sources below. Sources were accessed during the article's research or latest material review.
- [1] Plumbers in Ireland - Choosing a hot-water cylinder and 2026 costs
- [2] SEAI - Installing a heat pump
- [3] SEAI - Domestic Technical Standards and Specifications
Official guidance and further reading
These links are further reading and do not substantiate every estimate above.