AI Summary

In British homes, surplus rooftop PV has traditionally been managed by an immersion diverter that detects exported power with a current clamp and channels it into the hot‑water cylinder’s immersion element, a cheap solution compatible with most cylinders and previously used in gas‑heated homes. Under the Boiler Upgrade Scheme, many homes in England and Wales are replacing gas boilers with air‑to‑water heat pumps, often installing solar panels concurrently. In these heat‑pump installations, the immersion diverter’s control logic no longer functions as intended, rendering the usual approach ineffective.

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