"Andy Champ" wrote in message
...
Tony Bryer wrote:

http://www.zenexenergy.co.uk/Zenex1/...w=article&id=9


Vague memory of this being mentioned before. And the price-performance
was called into question. It's a preheater for the incoming cold water
supply though, rather than the incoming cold air.

It will heat incoming air. This box is used for combis, so not applicable
for CH. It can also be used to assist in heating a heat bank/thermal store
while the boiler operates, using a pump, and increasing efficiency.

They are one of the few eco devices that have a short payback time, along
with rainwater recovery.

To warm incoming air you need long flue lengths in concentric flue pipes.