36kW single-phase water heater

ban-all-sheds · 5 Apr 2015

Been looking into alternatives to the usual Mira/Redring/Triton/etc electric showers, and came across these peeps:

http://www.stiebel-eltron.co.uk/

who have all sorts of instant electric water heating products, including this range, with an interesting spec for supply requirements...

And no, they do not mean 3-phase - the same catalogue has several products where they do say they need that.

Where's that form to ask SSE if it will be OK to have a 150A appliance....

bernardgreen · 5 Apr 2015

My money is on a misprint that the proof readers did not spot

1/N/P/E 208~240V

but the current rating is listed as 3x50

I am sure it should be 3/N/P/E

ericmark · 5 Apr 2015

I question where would it be used? I have seen farms and caravan sites with a single phase supply but the drop down transformer is normally split phase and of course all domestic consumer units are rated 100 amp.

It would be rare to have a supply over 100A which is not either split phase or three phase.

I have worked with water heaters which were in essence a load of immersion heaters and the installer has the option on how to wire. Many although not all shower units are small water tanks with a device with restricts the flow to ensure the temperature is maintained.

The electric central heating boilers have very little contained water in them are are near enough the same as a shower unit except they have more controls. At that output the using would have more controls than a simple shower and really it's just an electric boiler like any other except it does not have an auto device to monitor inlet temperature.

JohnW2 · 5 Apr 2015

bernardgreen said:
My money is on a misprint that the proof readers did not spot ... 1/N/P/E 208~240V ... but the current rating is listed as 3x50 ... I am sure it should be 3/N/P/E

Indeed - my money would also be on that ... and three of them have currents listed as 2xX, which is a bit more odd.

However, if it really was meant to be single-phase, why on earth would they give the current requirement as, say, 3x50A, rather than just 150A?

Whatever, the largest of the these clearly are not intended for domestic use!

Kind Regards, John

PrenticeBoyofDerry · 5 Apr 2015

I think they can be installed either single or three phase.

29/29 Plus & 36/36 Plus may be wired for balanced 3-phase 208V. 15/15 Plus, 20/20 Plus, 24/24 Plus may be wired for unbalanced 3-phase 208V.

care of http://www.stiebel-eltron-usa.com/pdf/brochure_tempra.pdf

bernardgreen · 5 Apr 2015

Tempra® 36/36 Plus 240V single 36 3 x 50 3 x 60 6 AWG 92 92 82 55
208V single or balanced 3-phase 27 3 x 44 3 x 60 6 AWG 92 82 61 41

Edit Prentice beat me to it......

Adam_151 · 5 Apr 2015

ban-all-sheds said:
Been looking into alternatives to the usual Mira/Redring/Triton/etc electric showers, and came across these peeps:

The only worthwhile thing to replace an electric shower with is a system working at pressure and supplied from the DHW system

whether that is:

A combi with a decent output
An unvented cylinder set up
or a pump off a normal gravity vented dhw system

westie101 · 5 Apr 2015

Tell you what though, the quoted voltage range does not meet UK standards!

bernardgreen · 5 Apr 2015

Adam_151 said:
A combi with a decent output
An unvented cylinder set up
or a pump off a normal gravity vented dhw system

or mains pressure via a heat exchange coil in the top of an unvented hot water cylinder

EDIT that should read a vented hot water cylinder This works well in my cottage.

JohnW2 · 5 Apr 2015

westie101 said:
Tell you what though, the quoted voltage range does not meet UK standards!

Sure, but nor do all those things with a quoted 'voltage range' of 100V-240V or suchlike! There's nothing wrong in their making products which can be used in counties with different supply voltage standards.

Kind Regards, John

westie101 · 5 Apr 2015

There's nothing wrong in their making products which can be used in counties with different supply voltage standards.

True, but the number of voltage issues and reports of equipment damage when voltage is in the 240 - 253 (UK upper limit) is getting beyond a joke at times.

wundaboy · 6 Apr 2015

Going by the quoted voltage range I'm guessing these are pitched primarily at the American market - 208Y/120 3 phase and 240/120 split single phase are standard supply configurations there.

Plus, they have higher capacity domestic supplies there - 200A @ 208/240V is the modern standard. So whilst it's beyond the pale to have a 36kw heater on a standard UK supply, it might be doable on an American one.

ColJack · 7 Apr 2015

can't be american, weight is in kg..

wundaboy · 7 Apr 2015

ColJack said:
can't be american, weight is in kg..

http://www.stiebel-eltron-usa.com/techdata_tempra_tempraplus.html

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36kW single-phase water heater

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