electrical isolation of undersink water heater

[nedwards9820]

I have taken delivery of an undersink water heater. It is fitted with an RCD on the electrical supply cable which terminates with a euro-plug. I am planning to cut the plug off and hardwire it to a switched fused spur. There is a curious electrical isolation connection that is supposed to be fitted to the hot water outlet. The installation video shows metal-braided water hoses being fitted to the cold and hot water connections. What is the isolator supposed to be doing?

Do you think it is preventing electro-galvanaic processes within the heater? Maybe for properties that have copper water pipes?

As the heater contains a stainless steel heating tank with metallic pipe connections, I can't see that the electrical isolation device on just one side will actually actually achieve any electrical isolation.

Is this a misplaced attempt at double isolation? Maybe the water connections are supposed to be made with non-metalic hoses? Stills from the installation video ( assembly vedio.mp4 - https://we.tl/t-MTnshSodkE ) are attached.

The manual says to ensure you have a professional electrician wire the heater to a 110V supply.

 

[davesparks]

The UKCA mark has replaced the CE mark in the UK since brexit.

 

[nicebutdim]

The UKCA mark has replaced the CE mark in the UK since brexit.

And probably stuck on sub-standard goods in much the same way as they CE mark has long been.

 

[Avo Mk8]

Thanks to everyone for their views on this. I'm sending the heater back with this note: "The heater itstelf has no CE rating plate on it so it shoud not be sold in the UK. The information plate that is on it has not been completed to identify basic essential electrical safety information such as the voltage. I will be returning the unit. Please send me a postage-paid label."

Probably too late for your message to the supplier, but it is illegal to sell appliances/equipment in the UK (with a flex intended to plug in) without a UK plug being factory fitted (usually the moulded on type). It is not acceptable to supply with unterminated flex, or any other plug type. The supplier can be prosecuted, and Trading Standards would (in theory!) be interested.

The Plugs and Sockets etc. (Safety) Regulations 1994

These Regulations re–enact with modifications the provisions of the Plugs and Sockets etc. (Safety) Regulations 1987 (S.I. 1987/603) and make provision for the first time for certain requirements to be satisfied in relation to appliances.

www.legislation.gov.uk

 

[davesparks]

The RCD is CE rated and 230V. Is there any way to check it really is CE rated?

Is there any other marking on that RCD unit?

It should have the BS/EN standard number that it complies with marked on it. Along with a UKCA mark if it is intended for the UK market

 

[Rockingit]

There's some stunning Chinglish on that data plate