Home Heating Systems Ireland 2026: Which Option Suits Your House?

Replacing an old oil boiler? Renovating a bungalow? Wondering whether an air-to-air heat pump would heat your home—or whether air-to-water would work with your existing rads?

Choosing a heating system is about more than the appliance. It is about the house around it.

Your insulation, room layout, hot-water demand and existing heating system all matter. An older house is not automatically unsuitable for a heat pump, but it needs an assessment rather than a recommendation based on its age alone. SEAI advises homeowners to address heat loss and investigate their options before a boiler breakdown forces a rushed decision.

This guide explains the main home heating systems available in the Republic of Ireland, what makes them different and the types of properties where they may be worth considering.

Air-to-Air vs Air-to-Water: The Main Difference

Both systems extract heat from outside air using electricity. The difference is how they deliver that heat indoors.

Air-to-air heats the air in your rooms. Air-to-water heats water for your central heating.

An air-to-water system can also heat a suitable hot-water cylinder. A conventional air-to-air system does not heat the water for your taps, bath or shower, so a separate hot-water arrangement is needed.

1. Air-to-Water Heat Pumps: Radiators, Underfloor Heating and Hot Water

An air-to-water heat pump transfers heat into a water-based heating circuit. It can supply radiators, underfloor heating and a compatible hot-water cylinder.

It can work in both new and older homes. However, the building’s heat loss and the heating system must be assessed together to achieve good performance.

What type of home can it suit?

Air-to-water is worth investigating for a well-insulated semi-detached house, bungalow, detached home or a property undergoing a substantial retrofit—particularly where you want one system to provide central heating and hot water.

You do not automatically need underfloor heating or a completely new set of radiators. The installer should check whether each radiator can provide enough heat at the proposed operating temperature. Some existing rads may be suitable; others may need upgrading.

Ask for a room-by-room heat-loss calculation, correctly sized equipment and a clear explanation of the proposed cylinder, controls and heat distribution. Selecting a heat pump simply because it matches the old boiler’s output is not a proper design method.

Read our heat pumps Ireland guide for more information about the benefits and preparation involved.

2. Air-to-Air Heat Pumps: Heating Without Water-Filled Radiators

An air-to-air heat pump normally has an outdoor unit connected to one or more indoor units. These deliver warm air directly into the rooms. Depending on the system, indoor units can be wall-mounted, floor-standing, ceiling-mounted or connected to ductwork. Reversible models can also provide cooling.

What type of home can it suit?

Air-to-air is worth comparing for a compact home, a property currently using direct electric heating or a garden office where water-based central heating would be unnecessary.

It may also be an option for an apartment where a suitable outdoor-unit location and the necessary permissions are available. That is a site-specific question—not something to assume from the property size.

The main design issue is coverage. One unit in the sitting room should not be assumed to heat closed bedrooms, bathrooms and the rest of the home adequately. The heating design should account for each room’s demand and the way warm air reaches it.

Do not forget the hot water. A standard air-to-air system does not heat your domestic hot water, so include the cost and running requirements of a separate solution when comparing quotations.

3. Back Boilers and Boiler Stoves: Heating From a Fire

In this section, back boiler means the solid-fuel type associated with a fireplace, rather than an older gas back-boiler appliance.

A solid-fuel back boiler uses heat from the fire to heat water. A boiler stove also provides heat to a water-based heating system while giving off heat into the room. The split between room output and water-heating output is important when assessing suitability.

A room stove is not the same as a boiler stove

A room-heating stove heats the room where it is installed.

A boiler stove is designed to supply a connected central-heating system and hot water as well as heating the room. Buying a stove does not automatically mean it can heat your radiators.

What type of home can it suit?

A boiler stove may be worth assessing in an existing home with a suitable heating circuit, chimney or flue, and occupants who are prepared for the practical requirements of solid-fuel heating.

It should not be chosen simply because the house is old or rural. Check the appliance’s output to the room separately from its output to the boiler. Too much room heat can be a poor match for a small, well-insulated sitting room, even where the house needs central heating elsewhere. Manufacturers publish these outputs separately.

Fuel-burning appliances need proper maintenance, ventilation and clear flues. A working carbon-monoxide alarm provides additional protection, but does not replace servicing or chimney maintenance.

For an old or unused installation, arrange an assessment before bringing it back into service or altering the heating connections.

4. Oil, Natural Gas and LPG Boilers: Understand the Existing Setup

Oil and gas boilers provide heat for water-based central heating. Depending on the system, domestic hot water may be stored in a cylinder or produced on demand by a combination boiler.

Natural gas requires an available network connection. Oil and LPG are alternatives used where mains gas is unavailable, but their storage and installation requirements must be considered. LPG installations can involve a tank and associated supply pipework.

What type of home can they suit?

For a home already using oil or gas, the decision may involve keeping a safe, serviceable system while improving insulation, or comparing replacement options as part of a wider upgrade.

An older bungalow does not automatically need another oil boiler. Equally, fitting a heat pump alone will not fix excessive heat loss.

SEAI recommends preparing older homes through appropriate insulation improvements and investigating the changeover before the existing boiler fails.

All domestic natural-gas and LPG work must be carried out by a Registered Gas Installer, with the appropriate Completion Certificate supplied. RGI registration is a requirement for gas work—not a blanket qualification covering every heating technology.

Read our gas boiler servicing and heating-system maintenance guide.

5. Direct Electric Heating and Storage Heaters

Direct electric heaters include panel heaters, convectors and plug-in oil-filled radiators. They convert approximately one unit of electricity into one unit of heat at the point of use.

That is different from a heat pump, which moves heat and can deliver several units of heat for each unit of electricity consumed under suitable conditions. “100% efficient” does not automatically mean the cheapest system to run.

What type of home can they suit?

Direct electric heating is worth comparing for an occasionally used room or a space with a low heating requirement. For daily whole-house use, ask for an annual running-cost estimate rather than judging the system only by its purchase price.

Storage heaters use electricity to store heat during charging periods and release it later. With an appropriate tariff and correctly configured controls, they can make use of lower-priced electricity. The household’s schedule and the heater’s controllability are important. Storage heaters do not heat the hot-water cylinder; that is a separate system.

For an apartment where a heat-pump outdoor unit is not feasible, improved storage heating may be one option to compare with other suitable arrangements.

6. Ground-Source Heat Pumps

A ground-source heat pump collects heat through buried pipework or boreholes, rather than an outdoor air-source unit.

It may be worth investigating for a suitable rural property, a larger site or a new build where groundworks can be planned from the outset. The ground collector can be horizontal or vertical, depending on the site and design. Installation is generally more involved than an air-source system.

Having a large garden is only a starting point. Ask a specialist to assess the site, collector requirements, installation cost and expected performance.

Trade Source IRE can help with enquiries for groundworks contractors alongside the heating specialists required for the project.

7. Pellet Stoves and Biomass Heating

Pellet appliances are available as room-heating units and central-heating models. A central-heating pellet appliance can supply a suitable heating circuit and hot water, whereas a room-only model cannot.

For a homeowner considering pellet heating, the useful question is not simply, “How many kilowatts is it?”

Ask whether the proposed appliance will heat one room or the whole home, how fuel will be stored and supplied, what maintenance is required, and who will service it locally. Compare those practical requirements with other heating options before committing.

Is Underfloor Heating a Separate Heat Source?

Wet underfloor heating distributes heat; it does not generate it. Warm water passes through pipes beneath the floor, supplied by a compatible heat pump or boiler.

It is worth considering during a new build or major renovation, when the floor construction can be planned around it. Suitable radiators remain another option, and a professionally designed system can use a combination of both.

When requesting a quotation, specify whether you mean water-based underfloor heating or electric heating mats. They are different systems and should not be treated as interchangeable.

Which Heating System Should You Investigate First?

These are starting points for a professional assessment, not guaranteed matches based on house type.

The underlying principle is to assess the property and heating demand before selecting equipment. SEAI’s heat-pump guidance and heating-design requirements support this building-specific approach.

Insulation and Ventilation Come Before Bigger Heating Bills

Whatever system you choose, reducing heat loss means less energy is needed to keep the house comfortable.

However, insulation and airtightness improvements must be considered alongside ventilation. Appropriate ventilation helps remove moisture, stale air and pollutants and reduces the risk of condensation and mould.

Read our home insulation and retrofitting guide and BER rating guide before planning a major heating change.

A bigger boiler is not a substitute for a better-insulated home.

Heating Costs and SEAI Grants in 2026

Compare the complete project, not just the appliance price.

Ask for a written quotation showing the heating equipment, hot-water cylinder, radiators or underfloor heating, controls, electrical work, removal of the old system, commissioning, certification and any making-good work.

Our Plumber Costs Ireland 2026 guide and Electrician Costs Ireland 2026 guide can help with initial budgeting. Obtain a current quotation for the actual property before deciding.

SEAI supports several heat-pump types, including air-to-air, subject to the relevant eligibility conditions. Grant amounts differ by system and dwelling type. Approval must be in place before grant-supported work begins, and the contractor must be registered for the relevant work.

Use our SEAI Grants Ireland guide alongside the current SEAI heat-pump grant information.

Find Heating Professionals with Trade Source IRE

You do not need to know which system to buy before sending an enquiry.

Trade Source IRE helps homeowners find potentially suitable plumbing, heating, electrical and insulation professionals. Tell us about the property, the existing heating system and what you want to improve.

It is free to enquire, with no obligation to proceed. We review the requirements and help route the enquiry to suitable professionals where available. You remain in control of comparing quotations and choosing who gets the job.

For your project, you can find:

• Plumbers and heating professionals
• Electricians
• Insulation contractors
• Builders for renovation and retrofit work
• Groundworks contractors

Include your county or town, property type, approximate floor area, current fuel, BER where available, number of bathrooms and preferred timeframe.

Before appointing anyone, check their insurance, relevant experience and registrations. Domestic gas work requires an RGI, while electrical work requiring registration and certification must be completed by a Safe Electric Registered Electrical Contractor.

Request a tradesman for your heating upgrade.

Choose the heating for the house—not the house around the heating.

Every Trade. One Trusted Source.

Republic of Ireland Information Sources

SEAI — Ireland’s national energy authority

Homeowner’s Guide to Heat Pump Systems · How Heat Pumps Work · Is Your Home Ready for a Heat Pump? · Current Heat Pump Grants · Ventilation Systems

SEAI — Technical explanations of heating systems

Electric Heaters · Boilers and Solid-Fuel Heating · Heat-Pump Design Requirements

Commission for Regulation of Utilities

Gas Works in Your Home · Electrical Works in Your Home

Gas Networks Ireland and Electric Ireland

Carbon-Monoxide Safety · Gas Connection and Heating Changeover · Storage Heaters Explained

Irish heating manufacturers and suppliers

Grant Ireland — Heating-System Design · Waterford Stanley — Room Heating Versus Central Heating · Waterford Stanley — Boiler Stove Outputs · Flogas Ireland — LPG Home Heating

This article provides general information for homeowners in the Republic of Ireland. System suitability, installation requirements, running costs and grant eligibility depend on the individual property and proposed work. Obtain a professional assessment before replacing or altering a heating system.