Cable for 12kw electric boiler

[Taylortwocities]

How on earth could one achieve that - if it really is a 'simple' 12kW boiler, then it will inevitably take double that current, no matter what the time of day/night.

As everyone has asked, what exactly is this '12kW boiler', and is there any facility (e.g. multiple switched elements) to run it at less than 12kW ??

The plot thickens, and a bit more daylight (for me anyways).

Yesterday I went to a rural cottage (electric only) and guess what they have as the heating/hot water supply? A 12KW electric only system!.

It's one of these . View media item 87867 View media item 87868 View media item 87869It's basically a combi boiler, so any discussion about E7/E10 off peak tariffs do not apply!
This one is 12KW (like the OP's) and is fed from a 63A breaker in the CU through quite a long length of 16mm² T&E (underground ) to the boiler outhouse.

The demand on this one is selectable through internal switches.

The client said that it was horrendously expensive last winter but they have added a wood burner with back boiler to hopefully help out with the bills.

Hope this helps put it into perspective.

Cheers

 

[Taylortwocities]

I reckon it's one of these;

http://www.heatandplumb.com/acatalog/Trianco_Aztec_Classic_Electric_Boiler_-_12kW.html

Manual (including electrical ratings, which do state 51A); http://www.gotogasdocs.co.uk/f/m/Trianco Oil Boilers/Electric Boiler/Aztec Classic UISM.pdf[/QUOTE]

Add-on

Having also looked at skotl's post, the Trianco is another approach. This seems to be a 12KW "instant" water heater. This works on demand in association with a Megaflo-type pressurised tank.

To do this, my guess would be you would need a double immersion set up on the Megaflo (one immersion on E7) and the 12KW requirement for the Trianco tank.

This may be a more efficient way of providing electric water&heating than the electric combi system.

 

[ban-all-sheds]

I want to get rid of ours and replace it with a normal oven/hob and boiler... the missus does not agree! They're not worth a great deal second hand, that is for sure.

Buyer collect.

 

[ban-all-sheds]

It's one of these .

Errr....

An electric boiler can replace any other small to medium size boiler in the home, and are known to be light, small and compact, often completely silent and, of course, boasting the main benefit of a low running cost due to the price of electricity in comparison to oil or gas.

 

[JohnW2]

Having also looked at skotl's post, the Trianco is another approach. This seems to be a 12KW "instant" water heater. This works on demand in association with a Megaflo-type pressurised tank. ... To do this, my guess would be you would need a double immersion set up on the Megaflo (one immersion on E7) and the 12KW requirement for the Trianco tank. ... This may be a more efficient way of providing electric water&heating than the electric combi system.

That's not really what I'm seeing in the Trianco Aztec documentation. They seem to be describing its use in exactly the same way as one would use any other boiler (involving 'real-time heating' of CH water), in a pressured or vented system, with no thermal/hot water storage other than the DHW cylinder, no immersions and no 'Trianco tank'. ... i.e. as far as CH is concerned, essentially just an 'electric combi system', but with an indirectly-heated DHW cylinder for some reason thrown in. Are we looking at different things?

Kind Regards, John

 

[Taylortwocities]

No, looking at the same thing, but I was looking at the "Combi Packs" on the Heat&Plumb site which include a cylinder that has an immersion as well.

I just threw in the suggestion of the immersion on an E7 tariff as a (probably) poorly worded suggestion to save some energy costs.

Although BAS has noticed from the TLC site that its a money-spinner to switch from gas to electric heating

 

[JohnW2]

No, looking at the same thing, but I was looking at the "Combi Packs" on the Heat&Plumb site which include a cylinder that has an immersion as well. ... I just threw in the suggestion of the immersion on an E7 tariff as a (probably) poorly worded suggestion to save some energy costs.

Well, anything which allows at least some of the electricity to be used at cheap night rates on a suitable tariff would obviously be desirable - but that applies equally to the 'boiler' itself or an immersion. In either case, the system will only provide a useful amount of daytime CH (using cheap rate electricity) if there is a large and efficient thermal store of some sort. I find it hard to believe that such a system is, in practice, likely to be sensibly viable for most people.

Kind Regards, John