What's the cost of replacing your boiler? Any repair carried out under the terms of this warranty does not extend the warranty beyond its original period. Let us service your heating system, deliver your fuel and keep your water flowing! Replacing an existing combi boiler. Can drain out bathroom be used in a toilet? If you suspect the blockage is on the public wastewater side and you are not connected to a septic tank then please contact irish water. Thank you for the clear and.