When it comes to repairing and replacing gas boilers it's vital that you use a Registered Gas Installer. In fact, it is a legally mandatory that all work performed on domestic gas installations is performed by a Registered Gas Installer.
Kieron Murphy Plumbing & Heating is listed as a Registered Gas Installer in Ireland.
http://www.rgii.ie/home/kieran-murphy-plumbing-heating.4582.html