Grundfos hot water pump running continuously

[chrisj14uk]

Hi all,

Hoping you can help... I've recently moved into a new flat and am a bit concerned about the plumbing. There's a continual hum from the airing cupboard, which contains two water pumps (judging from power lead labels, one for heating, one for hot water). The hot water pump is on 24/7... when thermostat and boiler are both powered down.

Is there any reasonable reason why the pump might always be on? I briefly found online hot water circulation systems etc.

Thanks
Chris

 

[gasmarc]

the pump should never run 24/7 unless it is wired wrong or there is a fault

 

[oldplumber]

Big flat, secondary return pump for HW?

 

[RoryD]

Do u have a thermal store?

 

[gasmarc]

would that be running 24/7 oldplumber

 

[ecowarm]

some of the old secondary circulation pumps ran 24/7 just fit a timer

Eco

 

[chrisj14uk]

There's a hot water tank, if that's the same thing...

There are two pumps coming off the hot water tank, only the one labelled 'hot water' is running continuously... so the water in the tank seems to be continually moving too, I'll see if I can upload a photo later this evening

Thanks

 

[RoryD]

thermal store

 

[philthecylinder]

Rory sounds right to me. Think you have a Gledhill boilermate Thermal store. This will run 24-7. Got to keep store at 75 degrees to work

 

[RoryD]

actually thermalc stores should be about 80 degrees...this is your central heating water, the dhw picks it's heat up from here