Oil fuelled boiler and immersion heater

Some alterations would have to be made, the water heater would be removed capped and if it’s conventional, using a f/e tank and and cold storage these would be capped. Your heating pipes to radiators may be ok to use if they are in good condition with no leaks, would recommend a power flush if existing heating pipes are used

It depends on whether the pipe was for both heating and hot water initially. But if not done together initially then you have to run the pipe for heat and then connect everything accordingly when you install the combi boiler

When transitioning to a new combi boiler, there are several aspects to consider. The current setup, consisting of an oil-fueled boiler for heating and an immersion heater for water, necessitates certain modifications for a smooth transition. Firstly, the existing water heater will need to be removed and properly capped, as it will no longer be required in the presence of a combi boiler. If your current configuration involves a conventional system with a feed and expansion tank, these components will also be rendered redundant and capped. Regarding the heating pipes that are currently in place for radiators, their usability depends on their condition. If these pipes are in good shape with no leaks or corrosion, they could potentially be integrated into the new combi boiler system. However, it's highly recommended to conduct a thorough assessment to ensure they meet the required standards for the new setup. To enhance the overall performance and efficiency of the new heating system, it's advisable to consider a power flush for the existing heating pipes. Over time, sediment, debris, and rust can accumulate within the pipes, affecting the efficiency of the heating process. A power flush involves using specialized equipment to thoroughly clean and clear out any obstructions within the pipes, thereby optimizing heat transfer and ensuring the radiators function effectively. In summary, transitioning to a new combi boiler entails the removal and capping of existing components like the water heater and, if applicable, the feed and expansion tank. The usability of the current heating pipes depends on their condition, and a power flush is recommended to improve the overall performance of the heating system. Engaging a professional heating engineer for this transition can ensure that the necessary adjustments are carried out effectively and efficiently.