When a new boiler is installed it is essential that your central heating system, be chemically flushed out, to remove any build up of ‘sludge’, especially for older systems. The system should then be refilled and treated with a corrosion inhibitor / protector. Failure to carry out this procedure (as specified in the Benchmark Central Heating Log Book) during installation may cause the new boiler to be contaminated by debris from the existing system.

Because modern boilers hold less water and are much smaller than their predecessors, they are more liable to be affected by debris in the system: heat exchangers, pumps or diverter valves are most at risk.

The guarantee of the boiler can be deemed void if the debris from the old system damages your new boiler.