Insinkerator UK's service agent has this morning confirmed that Insinkerator is not providing service kits for its HC1100 boiling water taps, so owners like us have to buy a whole new tap assembly each time that the small rubber O rings in the tap valves age or fail due to limescale build-up.
This happens every 3-4 years for us.
This is really poor from a sustainability and a customer care perspective.