I have a data logger on mine, we loose about 4-5 C out of the tank, and
surrounding pipes overnight (so in 7 hours).

We also loose about 2 C at 06:30, when we are still all asleep, I have
yet to track down what this is.

Its a bit weird, but it depends where you measure the tank, I have
sensors top & bottom, we can have the bottom of the tank hotter than the
top for long periods of time.

Mine is in a cupboard, I intend to insulate the cupboard. As somebody
else pointed out, there is quite a bit of circulation of water in the
pipes when there is no water use.

Rick

On Tue, 2009-07-07 at 14:30 +0100, Andrew McLeod wrote:
>
>
> Lee wrote:
> > Anyone know if CH pump bodies should be left exposed, or whether
> they can
> > be lagged too ?
>
> I'm pretty sure that the CH circulation pumps at work have a
> purpose-made
> moulded EPS insulation "shell" round them, but IIRC it's only round
> the pump
> itself, not the motor. I'll check when I go in this afternoon.
>
> I'm following this thread with interest, because I too have come to
> the
> conclusion that there must be significant heat losses from the heat
> bank in
> spite of it's built-in insulation layer and the lagging I've put round
> the
> "easy" bits of pipe.
>
> Andrew
>
>
>
>
>