New Electric Shower

kingstreet

Our bathroom is being renovated and we need an electric shower.

Vented heating & water system, so we want to feed from cold supply from header tank in loft. I'd shortisted this option;-

https://www.victorianplumbing.co.uk/mira-azora-dual-9-8-kw-electric-shower-frosted-glass-1-1634-156?searchText=mira elec

but I'm not sure about the water pressure. Part-P electrical work already done.

Can anyone tell me if this will be suitable?

Bendy_House

Minimum Dynamic Pressure: 70 kPa (0.7 bar)

As I understand it, that would require a 'head' of 7 metres. So, is the tank in the loft at least 7 metres above the shower position?

These instant electrics showers are really designed to be supplied directly from the cold mains, where the pressure is usually adequate.

FreeBear

Not suitable for systems with a header tank - For that, you need to select a model with a built in pump or connect it to the mains water pipe (if you have one with enough pressure/flow).

kingstreet

Thanks, both.

Needless to say the tank is about five feet higher than the tank.

FreeBear

Here is one example of a pumped electric shower suitable for use with a header tank - https://www.tritonshowers.co.uk/showers-taps/electric-showers/t80sr-pumped-electric-shower - No thermostatic control though...

kingstreet

Pumped electric shower it is then.

Ectophile

The alternative is to tap into the water supply to the header tank, not the one from it.  That should be at mains pressure, so an electric shower should work.

kingstreet

Ectophile said:

The alternative is to tap into the water supply to the header tank, not the one from it.  That should be at mains pressure, so an electric shower should work.

I've asked the plumber which he'd prefer. Thanks.