A plunger and and bit of arm action! Main exclusions of the vaillant repair & protect plan include: scale, sludge and hidden pipework, repairs related to the installation of the boiler, cosmetic or malicious damage, and indirect costs e.g gas supply. Make sure to repay in full before the end of the % period, or you'll likely get stung by the high apr that typically kicks in with these cards. What is the eco-mode setting on a boiler? is it cheaper than the normal function? These new-breed.