Despite a last minute change to the installation date (due to unforseen circumstances), our old tank system was removed & the new combi boiler fitted all in one day. At one point we had 4 workers on site all at once (1 engineer removing old, 1 engineer installing new, the builder to patch up walls & brickwork and the electrician wiring the system & fitting our nest controller system). All the guys were super friendly & efficient in their roles & had us back up & running again with minimal fuss. Our home was respected by all, despite it being temporarily turned into a building site, with our carpets & floors being covered to protect them from the work in progress. The 10 year warranty will give us peace of mind for the years ahead & I simply can't recommend simply warmer enough. A+++++