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Boilers

How long does a boiler installation take?

A like-for-like combi boiler swap usually takes one working day (6–8 hours). A full system upgrade — new flue route, new controls, system flush — typically takes 1 to 2 days.

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RGII
Registered & Insured
IS 813
Gas Safety Certified
4.9★
150+ Google Reviews
20+
Years Experience
Cert 3
Registered & Insured
€2,900
Boilers Installed From

Typical timings

Job scopeTime on site
Like-for-like combi swap6–8 hours (1 day)
Combi to combi with controls upgrade1 day
System boiler + cylinder + flush1.5–2 days
Oil to gas conversion2 days
Full new build install2–3 days

What we do on the day

  • Arrive 8:00 – 8:30 am, lay dust sheets
  • Drain and remove the old boiler
  • Fit the new boiler, flue and any pipework upgrades
  • System flush and pressure test
  • Gas-tightness test and RGII certification
  • Controls programmed, walk-through with you before we leave

Related questions

Will I have heat the same evening?+

Yes — for single-day installs, you'll have heat and hot water by the time we leave.

Do I need to be home?+

An adult needs to be on-site at the start (to talk through the install) and at the end (for the handover). The hours in between are flexible.

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Honest pricing, RGII certified, same-week appointments across Kildare and Dublin.

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