"Roger" wrote in message
k...
The message
from "Doctor Evil" contains these words:

2 * 2-port valves etc, but you'll also need a bypass (e.g. pressure
relief bypass) so when the last valve turns off and tells the boiler to
stop theres somewhere for water to go while the boiler keeps the pump
running as it cools down

That is only if there are rad valves on all rads. If the rads do not have
rad valves there is no need for it, unless the maker states one for heat
dissipation reasons.

Am I being particularly dim this morning or has DrivEl laid another
class 1 brick. ISTM that it doesn't matter a toss whether or not the
radiator circuits have TRVs as the 2 port vales would close each circuit
off entirely.


No Roger its not you g. Apart from your comment its usual to have "rad
valves on all rads" in this reality