Christian McArdle wrote:

TRV'ing everything and ruinning the whole sytem on a time clock is far
more energy efficient than having a master thermostat and no TRV's


Both of these systems would not be not permitted. You may have a master room
thermostat and TRVs, or all TRVs and a flow switch to detect the TRVs are
all closed. You may not use all TRVs and then pump hot water through the
bypass all afternoon.



Tough, cos my fan blown heat exchangers have their own stats, which work
the fans, not the flow.

Its on right now. The boiler hasn't fired up (tho the pump is running)
for about 1/2 hour.

If you have enough hysteresis in the boiler thermostat, it stays hot a
long time (with properly lagged pipes) before it cuts in again for a
five or ten minute burn..



Christian.