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Do-It-Yourself (DIY) Question & Answer Forum
Instant Water Heater Behind Partition (Tool), Isolator Location?
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<blockquote data-quote="jason1958" data-source="post: 348919" data-attributes="member: 12890"><p>Pull cord might suit a shower, but this is a 24/7 instant heater...</p><p></p><p>- basin for hand washing</p><p></p><p>- shower for body washing</p><p></p><p>Functional switching is via flow sensing...</p><p></p><p>- shower stop valve (on/off) with fixed shower head</p><p></p><p>- hot tap valve (on/off)</p><p></p><p>Emergency switching can be said to be handled by a) local functional valve &amp; b) digital output temperature regulation which operates irrespective of pressure/flow changes, and other safety cutouts. It got picked by the NHS for high risk areas.</p><p></p><p>MI simply specify permanent connection (so no 13A plug!), contact separation of at least 3mm on all poles (so no wiring to meter tails!), circuit breaker of suitable rating (ditto! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" />. MI do not specify a local isolator. Regs do not mandate a local isolator.</p><p></p><p>If it were a remote immersion heater offering similar functionality...</p><p></p><p>- Digital TMV + Secondary cutouts</p><p></p><p>- Remote switch - for occupier convenience (eg, downstairs)</p><p></p><p>- Local isolator - for maintenance convenience (eg, trivial cost over a junction box to join FTE to HR flex)</p><p></p><p>Ok...</p><p></p><p>- All items in the enclosure (partition) have IPx4+ rating.</p><p></p><p>- Both pump &amp; TX have integral IPx4+ switch for maintenance.</p><p></p><p>So for convenience, if not regs, a local IPx4+ isolator does ease maintenance of the instant-heater.</p></blockquote><p></p>
[QUOTE="jason1958, post: 348919, member: 12890"] 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 a) local functional valve & b) digital output temperature regulation which operates irrespective of pressure/flow changes, and other safety cutouts. It got picked by the NHS for high risk areas. MI simply specify permanent connection (so no 13A plug!), contact separation of at least 3mm on all poles (so no wiring to meter tails!), circuit breaker of suitable rating (ditto! :-). MI do not specify a local isolator. Regs do not mandate a local isolator. If it were a remote immersion heater offering similar functionality... - Digital TMV + Secondary cutouts - Remote switch - for occupier convenience (eg, downstairs) - Local isolator - for maintenance convenience (eg, trivial cost over a junction box to join FTE to HR flex) Ok... - All items in the enclosure (partition) have IPx4+ rating. - Both pump & TX have integral IPx4+ switch for maintenance. So for convenience, if not regs, a local IPx4+ isolator does ease maintenance of the instant-heater. [/QUOTE]
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Instant Water Heater Behind Partition (Tool), Isolator Location?
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