tony sayer wrote:

I think that the original poster wanted something that would monitor
voltages in his heating system which a simple UPS won't do all that
well..

If voltage is what he is interested in, then they actually keep detailed
logs... he may also find it cheaper than dedicated lan aware A to D kit.

Have a look at

http://www.moxa.com

they do devices similar like COM port to IP converters could have sworn
that I saw something like this around a while ago also look at

http://www.barix.com

they do some sort of remote data stuff....and

http://www.s-connect.ltd.uk/

almost certain one of those has what you want but don't expect it to be
cheap tho!....

At that sort of level you could even go as far as embedded PC solutions
with a PCI A to D card...!

As you say, it depends on how much you want to pay.

--
Cheers,

John.

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