Hot water cylinder

Hot water cylinder replacement across Ireland

Direct and indirect cylinders, heat pump cylinders, and pressurised unvented systems. Local plumbers across all 26 counties.

Find a plumber near you Cylinder types

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Signs your cylinder needs replacing

The hot water cylinder is the heart of your home's hot water system. In Ireland, most homes use an indirect vented copper cylinder heated by the boiler, but modern alternatives including unvented pressurised cylinders and heat pump cylinders offer better performance and energy efficiency. A replacement typically takes four to six hours and includes draining the old cylinder, fitting the new unit, reconnecting all pipework, and testing. Our directory connects you with local plumbers across all 26 counties.

The cylinder is leaking from the base or around the immersion boss
Hot water comes out discoloured or rusty
Water pressure has dropped noticeably over the past year
The cylinder is over 15 years old and repairs are becoming frequent
Visible corrosion or bulging on the outer casing
You are switching to a heat pump and need a compatible cylinder

Cylinder types our plumbers install

Vented copper cylinder

The standard Irish cylinder, fed from a cold water tank in the attic. Available in capacities from 90L to 300L. Suitable for most homes with a conventional boiler or oil system.

Unvented pressurised cylinder

Fed directly from the mains, delivering high-pressure hot water without a cold tank. Requires a qualified G3 engineer for installation. Ideal for modern bathrooms with power showers.

Heat pump cylinder

A larger-capacity cylinder with a large coil designed for the lower flow temperatures produced by heat pump systems. Typically 200L to 300L and includes additional immersion backup.

Thermal store

A thermal store holds a large volume of heated water that can supply multiple outlets simultaneously. Popular in homes with solid fuel stoves or solar panels feeding the system.

Typical hot water cylinder replacement costs in Ireland

Prices vary depending on cylinder type, capacity, and whether your system requires a full pipework reconfiguration. Unvented cylinders require a qualified G3 engineer and attract higher installation costs. The figures below cover supply and installation across the Republic of Ireland. Always get at least two quotes from local plumbers before committing.

Job	Typical cost
Vented copper cylinder 120L supply and fit	€600 to €900
Vented copper cylinder 180L supply and fit	€750 to €1,100
Unvented pressurised cylinder 180L supply and fit	€1,200 to €2,000
Heat pump cylinder 200L supply and fit	€1,500 to €2,500
Lagging jacket only (no replacement)	€80 to €150
Prices include supply and installation. G3 certification required for unvented cylinders.

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