A conversion from a conventional heating system to a combi system is a service in high demand. Many of our clients upgrade their old gravity or pumped/ vented systems with inefficient boilers to a modern condensing Combi boiler. The advantages are that it creates more space as the hot water cylinder, feed/ expansion, and storage tanks can all be removed. It also means that you will have instant hot water, eliminating any previous waiting times required to meet indirect hot water cylinder needs.