I have mine set quite high, and because all my towel rails have no TRVs on them, it does allow me to extract the heat. If the boiler has heated the water, I might as well have it. But there is a balance to be struck between the cost of running that pump longer, vs trying to dump any left over heat back in the house.
Honeywell evohome and OpenTherm integration
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Opentherm control of our boiler tends to keep the internal pump (within the boiler) running all day this time of year. Appears to keep circulating at very low temps, approx. 30c and fires the flame up every 15-20 mins to top up the flow temp or as needed to reheat the water cylinder. As we have the heating on all day does this normal?
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Thanks for clarifying but should the boiler fan also keep running? I say this because when the boiler is just circulating water (setpoint below return temp), it is surprisingly loud, in fact louder than when the boiler is actually heating at its lowest modulation/temp. It's almost as is, the fan defaults to a higher setting than when on its lowest modulation (5kw). Although our boiler is in the garage, the noise is very obvious when within our master bedroom above. Very certain the system is fully bleed of air, and the pipework is all secure etc...
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Originally posted by bruce_miranda View PostThe boiler should be completely off during a pump overrun. Unless your boiler is designed in a way that the fan is trying to also cool the boiler in an over run situation.
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Originally posted by G4RHL View PostMine does not fire up during an overrun, but that would defeat the object of the overrun, as you say, it should be off. My pump though is frequently starting up of its own volition, often every few minutes. There is an audible whoosh as it does so. It runs for a very short time and then stops to do the same again a little while later. There is no set pattern to how often it does this. I assumed the system (OT + Evohome) was wanting heat and the boiler sensing there was sufficient to circulate without firing up but I checked on the Panel and no room or zone was calling for heat, all showing 0%. Having had a noisy old boiler making lots of kettling noises and now a nice new Intergas in a way this noise of the pump starting is more intrusive than the noise of the old boiler - and she was noisy (I am referring to the heating appliance and not a person!).
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Originally posted by [email protected] View PostOur pump is integral to the boiler, and the fan appears to be directly linked to the pump speed.
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Originally posted by G4RHL View PostTo me that seems odd. The fan is doing a different job and is not needed when the pump alone is on. Mine certainly isn’t. The fan is needed to extract fumes from a firing boiler.
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