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Thanks, trying out a clipsal aquaseal isolator. Never used that particular model, but more compact in height than a rotary. 40A. IP66. 2 pole, lockable, M25 (backbox does rotate), will be interesting to see what wiring space is like. Pratley #2 flat gland on FTE, roll of SIHF 6mm left over so...

Apologies, forgot to thank you for your replies & discussion - much appreciated.

Pull cord might suit a shower, but this is a 24/7 instant heater... - basin for hand washing - shower for body washing Functional switching is via flow sensing... - shower stop valve (on/off) with fixed shower head - hot tap valve (on/off) Emergency switching can be said to be handled by...

An isolator outside the enclosure (partition containing water heater) provides little value - it just seems traditional as with conventional electric showers :-) Skilled: - Isolation can be handled by a main switch or CPD (w/lockoff). - Mechanical maintenance could use the CPD (w/lockoff)...

An isolator facilitates isolation of a fixed appliance during maintenance.   However, isolation may be provided via the main switch (eg, as kitchen appliances), unless the MI say otherwise.   To counter that, instant water heaters present a particular failure mode: unrelated plumbing works may...

Consider a service partition for a shower/basin ensuite, accessible via use of a tool. Services such as digital instant water heater (digital remote control), whale pump, yadda. Seems obvious to stick the 45A isolator outside the service partition, on the wall outside Zone 2 - but walls soon...