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...
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...