It is advised that electric combi boiler is not chosen for large houses with more than 2 bathrooms as it may not meet the high hot water demands. Each installation comes with a two to five year parts and labour guarantee, and all of the work we carry out is fully vetted by a number of relevant associations, including gas safe, the institute of plumbing and heating engineers (iphe) and the contractors health and safety assessment, ensuring the best possible workmanship every time.