Vaillant's ecotec plus is an a-rated option. Wondering about how energy efficient your new boiler will really be? We are a general building company with fifteen years work experience and full certification we cover plumbing, gas, electrical and all other aspects of building work. We are proud to install high-quality products from some of the top manufacturers, including. Your water company has a right to enter your property if it needs to do this in order to inspect or maintain.