Re:12Kw Electric Flow Boiler

[Steve Flex]

Hi All,

Anybody have any experience regarding a Heatrae Amptec 12Kw electric flow boiler with control timer. I have been asked to install the above along with a plumber friend. I have checked the demand on the installation,which is ok, as it will be pulling a good 50A when going. It will be a 10m run from the consumer unit to the airing cupboard. I have done the calculations and it will need to be run in 10mm. The thing is the installation guide dosen't mention a contactor, which I think is necessary. I am thinking a 6A mcb to run the timer via contactor, at least a 50A mcb to run the boiler via contactor. I haven't had much experience with contactors, any ideas? Oh, yeah and there is only one space left in the consumer unit!

Cheers

 

[electro]

Re: 12Kw Electric Flow Boiler

Hi
you dont as a rule need a contactor as the elements are stepping elements, so you dont pull 50amps straight off. good systems if you don't have a gas suppy. have you sorted out E10, you dont want to run these on a regular supply.

Regards

 

[Guest123]

Re: 12Kw Electric Flow Boiler

Hey.

With the large boilers and ground source heat pumps that I've installed, most of them have the contactors for various elements already installed within them.

The only thing I will say is to make sure that a 10mm is large enough for the job as a lot of the ones I've done I've had to use 16mm.

Indeed 12KW equates to 52A at 230V but with your short run it should be fine.

Hope this helps.

 

[electro]

Re: 12Kw Electric Flow Boiler

Hi

I think steve installing a electric wet system not the ground source heat pumps? Which one is it steve as they are totally different systems..

Regards

 

[Guest123]

Re: 12Kw Electric Flow Boiler

Hey mate.

I agree they are totally different systems, I was just trying to make a point about the contactor issue and that the larger heating appliances have internal contactors so no need for an external one to be installed.

 

[electro]

Re: 12Kw Electric Flow Boiler

Hi lenny

Sorry if I came across blunt, didn't want to confuse the issue, these electric heating systems are very new to the electric trade. You would be supprised how many of these systems are being installed wrong.
regards

 

[Guest123]

Re: 12Kw Electric Flow Boiler

No worries.

This new technology seems to be catching a lot of people out. I was on a job the other day with the commissioning engineer from Ice Energy who manufacture the ground source heat pumps.

It was his 4th job of the day and he hadn't been able to complete any so far as all the installation work by other contractors (plumbers mainly) wasn't correct so he couldn't commission.

Ice Energy even offer a free course to contractors on how to install all the pipework for these systems but from what he was saying they aren't interested in doing it.

It seems to me that these are becoming more and more common and will be another technology we all have to learn.

Sorry to have gone off thread a bit.

Regards

 

[mrloy99]

Re: 12Kw Electric Flow Boiler

Hi All,

Anybody have any experience regarding a Heatrae Amptec 12Kw electric flow boiler with control timer. I have been asked to install the above along with a plumber friend. I have checked the demand on the installation,which is ok, as it will be pulling a good 50A when going. It will be a 10m run from the consumer unit to the airing cupboard. I have done the calculations and it will need to be run in 10mm. The thing is the installation guide dosen't mention a contactor, which I think is necessary. I am thinking a 6A mcb to run the timer via contactor, at least a 50A mcb to run the boiler via contactor. I haven't had much experience with contactors, any ideas? Oh, yeah and there is only one space left in the consumer unit!

Cheers

If you wanted to use your one way left in the board and use contactors you could simply fit a fcu next to contactor and come off the live side fusing down and then to your timer. BUT it is more likely that your boiler will just need a permenant supply and your controls will come from it for your timer,roomstat,cylinderstat,motorised valves,via a wiring centre. With such a high load I would be tempted to fit a new one way board with own tails,63amp mcb,16mm cable and as previous poster suggests definatly go for E10 supply. I would also be a little concerned if you also have an instant shower,you might need to take other precautions.

 

[Steve Flex]

Re: 12Kw Electric Flow Boiler

Many thanks for the replies lads. I will definitely consider the e10 opton for the system. It will be used for hot water only in the summer as the couple have an oil fired arga running the hot water and heating through the winter. I have managed to get hold of the technical spec if anybody has time to look at it. Looks as though it is a straight run from the cu to a double pole isolation switch and a fused spur to run the programmer, doesn't seem to mention a pump feed? Fairly straight forward i hope.
Any thoughts? Cheers

http://http://www.plumbnation.co.uk/site/amptec-c1200-12kw-electric-flow-boiler/Heatrae%20Amptec%20Installation%20Guide.pdf

 

[Guest123]

Re: 12Kw Electric Flow Boiler

Hey.

Cant seem to open the link.

 

[Steve Flex]

Re: 12Kw Electric Flow Boiler

Hi Lenny,

Will post the link again. You are right it dosen't seem to be working!

http://www.specifinder.com/pdfs/2051_pdf2.pdf

Try this, Cheers

 

[mrloy99]

Re: 12Kw Electric Flow Boiler

Many thanks for the replies lads. I will definitely consider the e10 opton for the system. It will be used for hot water only in the summer as the couple have an oil fired arga running the hot water and heating through the winter. I have managed to get hold of the technical spec if anybody has time to look at it. Looks as though it is a straight run from the cu to a double pole isolation switch and a fused spur to run the programmer, doesn't seem to mention a pump feed? Fairly straight forward i hope.
Any thoughts? Cheers

http://http://www.plumbnation.co.uk...-boiler/Heatrae Amptec Installation Guide.pdf

A bit over the top at 700 quid a pop plus installation costs for to only be used as a water heater!!I thought they're for heating rads.

 

[markspark]

Re: 12Kw Electric Flow Boiler

have installed this system quite a few times, and if its done right, its brilliant! but as mentioned before , you cant have an instant shower as well as the c/heating due to loading issues.
as regard installation, its just the same as a gas c/heating system .
with thermostat and timeclock would definately go with the 16mm twin & earth supply fed from a new 3 way c/u . as you need a extra way for the central heating controls.

i agree that its expensive to use it as hot water boiler only!!!

 

[Scott F]

Re: 12Kw Electric Flow Boiler

Sorry to jump on this thread but as we are discussing boilers.Has anyone wired up any Nu Heat specifically "energy master thermal store cylinder with ground source heat pump ". I am just trying to get my head round it got the plans and relevant info .Has 12kw and recommends a 50 amp mcb but where is this fed to the heat pump itself and there are also fused spurs for the elements and pumps .(with me so far)and manifolds .would these be run separately on radials or all off the 50amp s will ring tech support in the week i am just trying to envisage the finished article so as not to miss anything out .Any help appreciated Scott

 

[mrloy99]

Re: 12Kw Electric Flow Boiler

have installed this system quite a few times, and if its done right, its brilliant! but as mentioned before , you cant have an instant shower as well as the c/heating due to loading issues.
as regard installation, its just the same as a gas c/heating system .
with thermostat and timeclock would definately go with the 16mm twin & earth supply fed from a new 3 way c/u . as you need a extra way for the central heating controls.

i agree that its expensive to use it as hot water boiler only!!!

I had a look at that link there and it appears to me that all controls come from the boiler,so you shouldn't need another way.I'd go for 16mm split conc. as I don't like useing T&E over 6mm.I also see that the link talks about optional extra relays for use in conjunction with electric shower,not sure how that would be wired(probably done back at the board?)