On 23/10/2019 14:24, T i m wrote:
On Wed, 23 Oct 2019 03:39:58 -0700 (PDT), wrote:

On Wednesday, 23 October 2019 00:22:17 UTC+1, T i m wrote:
On Tue, 22 Oct 2019 10:31:14 -0700 (PDT), tabbypurr wrote:

snip

It's a Y plan system but with no room stat, relying on thermostatic
rad valves and the boiler stat for CH. Simple and seems to work fairly
well, all be it not very 'adjustable' (but she rarely has the need to
adjust it it seems).

One way to stop the Mrs fiddling with the room stat is to not have
one. ;-)

We don't have one either, but then we don't have CH ...



Mad setup to have no room stat.

There are effectively stats in every room?

no, TRVs are not equivalent to room stats. We must have been over and over that on here.

You might have been but I haven't.

Ignoring the binary / analogue action, what is the (functional /
thermal control) differences between a thermostatic rad valve and a
room stat / room? And we are only talking about the ability to manage
the temperature in the room, nothing else / irreverent thanks.

This should be funny ...

TRVs and single room stat only run the system while that one room is too
cold. Once it heats up, the whole system stops, even if other rooms are
too cold. The whole system only runs or stops at the same times of day.

Timer/stat per room allows each room to have different times as well as
temperatures, runs while any room is too cold and shuts down boiler and
pump when there is no demand.

SteveW