That'll be fine - Just remember that someone will need to be able to get access to it and you will no longer be able to store stuff in the airing cupboard.
Unfortunately your description is not really suitable for diagnosis.
Have you got hot water all the time?
When you switch on the heating (With the taps closed) does the boiler do anything?
What revision PCB is in it?
Does the green light goto "static on" or "flashing on"?
Is there power on the switch live?
Is there power to the pump?
Is the pump running?
Is there power to the fan? And does that run?
Some very old or cheaply installed systems don't have a locksield or return valve.
Nothing to worry about; just prevents you from easily taking individual rads off the wall.... What is it you "actually" want to know?
I cannot recall or find any vrt378... I'm presuming this is just an obsolete stat.
However; any zero-volt switching room stat will work... So my question has to be do you want wired or wireless?
Keep number to yourself matey ;)
As for the fault - First thing first... How far away is the tap from the draw-off? Has the problem only just occured or is it an ongoing issue?
When you open the tap; if you look on the diverter valve; you'll see a sindle extend and hit a microswitch...
Couple of suggestions/statements:
a) What pipe is "leaking"?
b) Have you checked the tanks when the water is overflowing?
c) Why have you changed all them components? Each one is easy enough to test - If you want support diagnosing it - Be more specific - System/boiler type; actual fault, etc
How are they antiquated?
91% - A Rated efficiency
20 l/min @35 rise
Upto 15m of vertical and 13m of horizontal fluing
Class 5 NOX burner
Range from 7-30kW
I normally use a small adjustable spanner to undo them.... Otherwise a no.2 posie drive comes in handy :lol:
As for the boilers - Keep an eye out for leaking heat exchangers and low water pressure switches.
Just wire 1 of the boiler 0v wires to the clock "common"; then the clock "on" to the room stat "common" and then the room stat "on" to the other 0v on the boiler.
Page 17 of the installer manual; shows a 0v switching line on the main terminal block for a room stat; something like a Drayton LP111 or LP711 will do the job... Don't forget to leave the old clock on constant :wink: