>The rental we are in at the moment is unbelievable, there is no room stat
>anywhere. The whole thing depends on thermostatic valves that mostly don't
>work so we just turn in on and off. The boiler is a Potterton Netaheat with
>a fanned flue, it sounds like a jet engine running up.
How does the boiler know when there is no longer any demand for heat? Just the boiler temp?
All the installations I've seen have a thermostat in the busiest room with no TRVs on the rads to ensure that there is always some flow whenever the pump is running. Otherwise the pump cannot rotate. Other rooms can have TRVs set to whatever temp is wanted of course.
My boiler is an ancient Potterton Netaheat. Damn good boilers and worth keeping until spares get scarce according to the last guy who serviced it.
They are known for releasing Carbon monoxide tho' if the ceramic rope seal between burners and flue is damaged. CO should be tested whenever it is serviced and make sure that you have a CO detector in a suitable location.
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