This was a boiler I looked at this week for a good little customer who lives in Herringthorpe, Rotherham, S65. He called me to say his Vaillant ecotec plus 418 heat-only boiler was leaking and appeared to still be leaking even after the boiler had been turned off.
Vaillant Boiler Repair Service
Expert Gas Safe Registered Vaillant Boiler Service and Repair Specialist