Water tank in attic or outside house?

[Nickfromwales]

18 minutes ago, JSHarris said:

 

It depends.  A pressurised cold water system, like we have, doesn't require a Part G3 sign off, and can be done as a DIY job.  The same goes for a thermal store hot water system, if the thermal store itself isn't pressurised, and for a Sunamp PV; none need a Part G3 sign off or annual inspection.  You only need a Part G3 qualified installer, plus annual inspections, if you fit an pressurised, unvented hot water cylinder.

@PeterW, I think my crossed wire just got uncrossed.......cue another call to telford tomorrow. 

[Jeremy Harris]

3 minutes ago, Nickfromwales said:

@PeterW, I think my crossed wire just got uncrossed.......cue another call to telford tomorrow. 

 

It's the pressurised volume rule - the heat exchanger coil is the only pressurised part and will be under the volume limit to require a G3 sign off, as I understand it.  The bulk of the water in the thermal store will be unpressurised and vented via the header.

[PeterW]

20 minutes ago, JSHarris said:

 

It's the pressurised volume rule - the heat exchanger coil is the only pressurised part and will be under the volume limit to require a G3 sign off, as I understand it.  The bulk of the water in the thermal store will be unpressurised and vented via the header.

 

And this is where @Nickfromwales and me got into a discussion about having a sealed thermal store needing G3 sign off ... I think Telford haven’t understood the question the Welsh Wizard asked ... 

[Nickfromwales]

Nobody understands me.......

Actually the whole conversation revolved around a sealed and pressurised TS being used as a buffer, so by the sounds of it, the guy on the other end of the phone may have been half awake. 

Bugger. 

[mike2016]

Hi Nick,

Just on this: "If you NEED an accumulator then it would be best off outside so it stays cold, rather than attain house ( ambient ) temp, and fitted in an outhouse or other frost protected location"

Why do you need to keep it cold? Thanks.

[Nickfromwales]

If you have the accumulator in the house then it'll sit at the ambient temperature, so for eg 18^oC + which means that if you dont plumb the house with a separate dedicated cold mains to the kitchen sink / other drinking outlet then you'll never get a cold glass of water from the tap as it'll always be tepid at best. 

For me, when I open the cold tap to make squash etc I want to run it and for it to go cold, ok if youve got a chiller in the fridge or a boiling / chilled tap, but not ideal if you dont plan on either. 

All installs are case-specific so each to their own, but I always recommend putting the accumulator in a garage or at least outside the heated envelope to keep the cold mains 'cold'. 

You can do a separate feed from the main to the kitchen sink, but it causes all sorts of conflicts with un-blanacing the supplies at mixer taps, and is also not really a practical option if you need a softener.