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Bathroom water heaters

Installation has 40a mcb radial to electric shower. The bathroom has bad hot water supply. Could another instantaneous (or storage type I if not possible) water heater be installed on some circuit provided the switch is outside room and changeover type so both appliances can’t run at same time? Thanks 

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  • If the LSR1 (in that garo link) is a bit big, then it is possible to buy an MCB sized lump that is just the key part the actual load sensor and assemble it into any suitable enclosure.

    https://www.eibmarkt.com/gb/products/Doepke-Load-shedding-relay-6-7-39A-RLR-1.html

    Two terminals are wired  in series with the current to be detected, and the contacts that close can either be used to interrupt a small load directly, or of course more usefully  an arbitrarily  large load can be switched by  a suitable contactor.

    Mike

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  • If the LSR1 (in that garo link) is a bit big, then it is possible to buy an MCB sized lump that is just the key part the actual load sensor and assemble it into any suitable enclosure.

    https://www.eibmarkt.com/gb/products/Doepke-Load-shedding-relay-6-7-39A-RLR-1.html

    Two terminals are wired  in series with the current to be detected, and the contacts that close can either be used to interrupt a small load directly, or of course more usefully  an arbitrarily  large load can be switched by  a suitable contactor.

    Mike

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