Heating from a seperate building

[maccarooni]

eveng all,

Would appreciate your input on the following.

Been asked to quote for a rewire. At the moment they have Nightstore heating but will be upgrading to boiler, S/plan possibly. They want the heating to be set up in a shed, about 2ft from the house. and just programmer/stat in the house. All wiring in the shed. Now as it is detached from the house, what would the suggested earthing arrangement be. House has pme, so would a 10mm T&E submain to a shed board, along with a 10mm bond, TT'd be the answer? Incoming water is in existing kitchen, and the heating will be oil, so presume oil staight to shed.

Macca.

Guinness

 

[Dane]

1 question, why would they have dirty oil central heating that costs a bomb?

 

[musicspark]

1 question, why would they have dirty oil central heating that costs a bomb?

In rural areas what other options could you recommend Dane?

 

[Bez]

I'm open to get shot down on this one, but can't you use existing earthing arrangements?

Hang on while I duck!

 

[Dane]

In rural areas what other options could you recommend Dane?

Air/Ground source and/or electric boiler.

I run a 12kw Inline boiler as im "rural ish" no gas.

and my electric bill averages out at 1400 for the year. (not exactly small house either)

 

[batty]

Air/Ground source and/or electric boiler. I run a 12kw Inline boiler as im "rural ish" no gas.

and my electric bill averages out at 1400 for the year. (not exactly small house either)

Those electric boilers seem to work well did one last year to replace a broken one. Ground source is good on new jobs not had any dealings with air source.

Batty

 

[maccarooni]

1 question, why would they have dirty oil central heating that costs a bomb?

the property is in a very remote location....

This is a common fuel in the remote corners in Cornwall.

Macca

 

[Dane]

the property is in a very remote location....This is a common fuel in the remote corners in Cornwall.

Macca

There are a few options though that are much better than oil, and much cheaper to run.

Just a suggestion

As above, Electric boilers are actually getting very efficient.

Air source and ground source can give e a 60 degrees C water temperature and are pretty much free heating

 

[maccarooni]

I'm open to get shot down on this one, but can't you use existing earthing arrangements?Hang on while I duck!

hsd considered this bez, but as both oil and water will the introduce

a potential difference, I think TT'ing the shed will be the answer, however am still looking forward to more replies.

Macca

 

[musicspark]

There are a few options though that are much better than oil, and much cheaper to run. Just a suggestion

As above, Electric boilers are actually getting very efficient.

Air source and ground source can give e a 60 degrees C water temperature and are pretty much free heating

where can I find out about air and ground source?

 

[NozSpark]

I saw an article (ad) in PE the other day about electric heating..

It was from http://www.electric-heatingcompany.co.uk/ and they recon that it's cheaper than oil and E7..

The only thing is that you need to switch to the E10 tariff

 

[Tooold]

Had a very similar situation a while back, put a tt in outbuilding, then they added a copper cold water feed for washing machine, had to bond it so Ze was 80 and Zs .2.

I asked NIC inspector last week about TT and exporting he likes TT when plastic services are present in outbuilding and could see the problem with metal services but could offer no better solution than both TT and exporting. Like me he doesn

 

[Dane]

where can I find out about air and ground source?

My signature

and

http://www.energysavingtrust.org.uk/Generate-your-own-energy/Air-source-heat-pumps

http://www.energysavingtrust.org.uk/Generate-your-own-energy/Ground-source-heat-pumps

 

[kme]

To stick with O/P - having thought about this, I`d TT the shed; bond the oil to the TT, and get plumbit to use plastic / hep2O between house & shed (which is probably a better thermal solution, anyway)

That way, the shed & all copper with is earthed via TT, happy daze????

KME

 

[maccarooni]

Had a very similar situation a while back, put a tt in outbuilding, then they added a copper cold water feed for washing machine, had to bond it so Ze was 80 and Zs .2.I asked NIC inspector last week about TT and exporting he likes TT when plastic services are present in outbuilding and could see the problem with metal services but could offer no better solution than both TT and exporting. Like me he doesn

 

[maccarooni]

thanks KME

I think this is way to go.

macca.

 

[Tooold]

So was the Nic bloke saying to export and tt to a submain in the outbuilding?

Yes he was, it was to do with being stood on the ground outside of either building and the voltage to earth being different to the metal bonded pipework.

I may not have explained it well but I think you'll get my drift. As kme says plastic services are best but not always available.

 

[maccarooni]

Thanks toold.

Obviously i shall wait to see what plumber does will tt though.

many thanks for all replies

macca

 

[musicspark]

OK, I do admit that i didn't have the luxury of an apprenticeship, so I still sometimes get confused with terminology - exporting?

 

[binky]

With the shed so close to the house I think I would stick with the exported earth option, and some good size bonds, especially if pipes are copper back into property. Also you have 240v boiler controls back into property so keeping installation as one system seems more sensible to me. TT ing when this close seems unnecessary, and via boiler controls possible introduces differing earth potential to house.