"Tim" wrote in message
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On Thu, 04 Nov 2004 13:41:26 +0000, Christian McArdle wrote:

Would you say my instincts are correct or would this type of regulation
actually work?

It didn't give me a warm fuzzy feeling reading the specs. The "solid
floor only" restriction is probably about the inability to limit
temperatures to sensible values. There's probably an item in the
instruction manual saying to run the boiler at 50C or something.

Hi Christian,

The only fuzzy feeling I got was "ooh, that's simple to install and small
and neat".

They do claim the boiler can run at a standard 81/70C.

You really need to go the pump/TMV route.

I'm completely sure your instinct is well founded - I'm just being cheap
and was wondering whether it is too good to be true or not. I notice that
Baz found his Danfoss works in practise, so I'm still weighing it up...

Having 80C water through UFH pipes is ridiculous. It makes the floor far
too, hot. Then there is expansion contraction, etc. The Danfoss system is
assuming that the supply water is less than 55C.

'twoud be neat and simple though for one single little circuit - it seemed
a lot of effort to install a 4port mixer and an extra pump for one room.

No need for a 4 port mixer. A normal cheap 3-port will do.