[Stoves] Heat transfer and in-line water heater

[Steve Taylor]

Thomas Reed wrote:
> Dear Steve, Andrew and All:
>
> Radiation goes as
>
>     W = seA (T2^4 -T1^4 )
>
> .... and T2 is the emitter and T1 the receiver.
>   
Which indicates it IS driven by temperature difference, albeit with a 
4th power term. Thanks Tom.

Steve