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Feb 8 at 11:27 history edited Jonathan CC BY-SA 4.0
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Jan 23, 2022 at 8:55 comment added Chris H Keeping on top of the input filter is probably enough to prevent the heater overheating, which will give more limescale than running normally. You may still be getting a slow buildup, but you know how to keep it under control and what to do if you do start seeing limescale
Jan 23, 2022 at 8:52 comment added Jonathan The main input filter still blocks, and requires replacing every ~6 months. I just had this done, but there was no limescale buildup.
Jan 21, 2022 at 14:59 comment added Chris H It's possible that with insufficient incoming water (caused by the blocked input filter) limescale was building up on the heater faster than it normally would, and washing into the rest of the system. That's a lot of limescale, and it didn't form where you found it but somewhere upstream, from where it flaked off
S Jan 20, 2022 at 9:23 review First answers
Jan 20, 2022 at 12:50
S Jan 20, 2022 at 9:23 history answered Jonathan CC BY-SA 4.0