Underfloor heating pump

18 Jul 2009
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United Kingdom
I need some advice on the powering of an underfloor heating pump off of a Worcester 24cdi boiler. I have the mixervalve and the pump assembly attached to the heating circuit and the boiler. I just need to know the best way to power up the pump.

I can see the terminals on the boiler that drive the internal pump, and I am sure they will carry enough load to drive the second pump. The problem is that the internal pump will run when the boiler is in hot water mode as well as heating mode. Would it be ok to run this U/F pump at the same time?


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buy an external clock or programmer and wire it into that for seperate underfloor control
what system have you got at the moment,? if you have an S plan its simple enough to add an other zone to control the ufh.
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24cdi combi by sounds of it.like gaspro has said get seperate controls for underfloor heating. ring honywell they will give you a schematic of what you want doing if you tell em what it is you want.
A simpler and cheaper solution would be to power the UFH pump via a pipe thermostat so that it only runs when the pipe from the boiler is hot.

Thanks People.... I'll look at the seperate control device, as its a secondary and not hydraulicaly seperated I need to be sure that it does not operate with the primary pump, so the thermostat on the pipe sounds the simplist... and to be quite honest... bloody obvious... Hers one I wished I'd thought of earlier...lol


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