"Set Square" wrote in message
...
In an earlier contribution to this discussion,
dennis@home wrote:

"Set Square" wrote in message
...
In an earlier contribution to this discussion,
dennis@home wrote:


Your solution is a recipe for heating *everything* whenever
*anything* needs heating!

No it will only heat if one of the stats calls for heat just like most
systems with TRVs.

The problem is that it will heat *both* zones when *either* zone is
calling
for heat rather than just heating the desired zone. You might effect some
damage limitation by having TRVs set higher that the room stats - but
that's
pretty hit and miss, and still an *almighty* bodge!

Like I said that's how TRV based systems work.
The room stat has to be in the warmest room and switch the system on even if
only that room wants heat.
That's why I think they are cr@p.
But if the system already works like that then its reasonable to extend it
in a similar way.

The only real problem is if the room stat is set higher than the TRV.
Then the pump will run continuously.
Even that may not be too bad if the pipes are insulated.