Heat Pump Installation in Dublin: What to Expect From Survey to Switch-On?

Switching to a heat pump is a big change for any home, and knowing what happens at each stage makes the whole project easier to plan. Most Dublin homeowners ask the same questions before they commit: How long will the work take? How much disruption will there be? What happens during each visit? This guide answers those questions step by step, from the first home survey right through to the day your new system is switched on, based on how DeWAR Gas Service carries out heat pump installation in Dublin.

What Is a Heat Pump and How Does It Heat Your Home?

A heat pump works like a fridge running in reverse. It takes heat from the outside air or the ground, raises its temperature with a compressor, and sends it into your radiators or underfloor heating. Underfloor heating runs well at around 30°C. Radiators can need much higher flow temperatures. This is why the survey stage matters so much.

Step 1: The Home Survey

Everything starts with a site visit. A qualified installer looks at your home to check whether it is ready for a heat pump. The survey usually covers:

Insulation and airtightness: A heat pump works best in a home that holds its heat. Attic, wall and window performance all count.
Your current heating system: Pipe sizes, radiator sizes and the condition of the system water.
Outdoor space: Where the outdoor unit can go, with enough airflow and a sensible distance from neighbours.
Electrical supply: Whether your fuse board and supply can take the extra load.
Hot water needs: How many people live in the home and how much hot water you use each day.

The installer will also do a heat loss calculation. This works out how much heat each room needs, so the heat pump is sized correctly. A unit that is too small will struggle in a cold January. One that is too big will cycle on and off and waste energy.

Step 2: Your Written Quotation and System Design

After the survey, you receive a written quote that sets out the recommended heat pump model, cylinder size, any radiator upgrades and the work involved. DeWAR installs the Viessmann heat pump range, which suits both older homes being upgraded and new builds.

This is also the right time to talk about grants. SEAI supports heat pump installations in qualifying homes, and your installer can explain what applies to your property. You can read more on our home heating grants page.

Step 3: Paying for Your Heat Pump

A heat pump is a long-term investment, and not everyone wants to pay the full amount in one go. DeWAR offers Finance by humm, which lets you spread the cost into manageable repayments. Combined with any grant you qualify for, this makes the switch possible for many more households.

Step 4: Preparing for Installation Day

Before work begins, your installer will agree a start date and explain what needs to be cleared. Usually this means:

Clear access to the hot press, boiler and outdoor wall
Space around radiators that may be swapped out
A plan for hot water while the old system is removed

If your current system has sludge or blockages, a power flush may be advised first. Clean system water helps a heat pump run at its best and protects the new parts.

Step 5: The Installation

A typical installation in a Dublin home takes between two and five days, depending on the size of the house and how much pipework or radiator work is needed. The main jobs are:

Removing the old gas or oil boiler
Fitting the outdoor unit on a solid base or wall bracket
Installing a new hot water cylinder
Upgrading radiators or pipework where needed
Wiring the system and fitting smart controls

If you are not sure a heat pump suits your home yet, a gas boiler replacement or oil boiler replacement may be a sensible step for now. Your surveyor can talk you through both options honestly.

Step 6: Commissioning and Switch-On

Once everything is fitted, the system is filled, pressure tested and commissioned. The installer checks flow temperatures, sets the weather compensation curve and confirms every room heats properly.

You then get a handover. This covers how to use your controls, how to set schedules, and why a heat pump works best running low and steady instead of being switched on and off like a boiler.

Step 7: Aftercare and Servicing

A heat pump needs a yearly check to keep it running well and to protect your warranty. DeWAR offers a dedicated heat pump service, and if something goes wrong, you can book a heat pump repair with our directly employed, locally based team.

Conclusion

Installing a heat pump in Dublin follows a clear path: survey, design, finance, preparation, installation, switch-on and aftercare. A careful survey and correct sizing make the biggest difference to how warm and efficient your home feels. DeWAR Plumbers are accredited heat pump installers who have looked after over 39,000 customers across Dublin. To arrange a survey or get a free written quotation, contact our team.

Phone: 01 514 3344
Email: info@dewargasservice.ie
Address: 68 Rathgar Avenue, Rathgar, Dublin 6, D06 KN53

FAQs

1. How long does a heat pump installation take in Dublin?

Most installations take two to five days. Larger homes, or homes needing new radiators or pipework, can take longer.

2. Is my home suitable for a heat pump?

Many Dublin homes are suitable, but insulation, radiator size and outdoor space all play a part. A home survey is the only reliable way to know.

3. Do I need to replace all my radiators?

Not always. Some radiators may need upgrading so the system can heat rooms well at lower temperatures. The heat loss calculation shows which rooms need changes.