It is always important to understand the scope and conditions of any warranty and, as a manufacturer, we believe we should make this information very clear. In the case of our manufacturer warranty for your boiler it applies solely to the appliance supplied, and not to the hot water or central heating system (i.e. taps, showers, radiators, pipework, radiator valves, etc.).
This means that if a fault on your central heating system is having a detrimental effect on the performance of your boiler, it will invalidate the boiler warranty. For example, if your central heating system is full of sludge caused by deposits from rust in your system and it makes its way into the components of your new boiler, the warranty will be void.