https://community.viessmann.de/t5/Gas/Low-Loss-Header-second-pump-control/m-p/220338#M68315 <P>We have a large house and are planning to install a 200-W 32kw system boiler, with ‘low loss header’ and an external pump.</P><P>i would like to know what control (if any) the boiler has, over this external pump? &nbsp; How is this achieved, what parts are required?</P><P>finally - is there a recommended pump type/make - like Grundfos Alpha3?, or Magna1? Etc&nbsp;</P><P>many thanks&nbsp;</P><P>&nbsp;</P> Fri, 18 Feb 2022 06:14:55 GMT Papawads 2022-02-18T06:14:55Z https://community.viessmann.de/t5/Gas/Low-Loss-Header-second-pump-control/m-p/220338#M68315 <P>We have a large house and are planning to install a 200-W 32kw system boiler, with ‘low loss header’ and an external pump.</P><P>i would like to know what control (if any) the boiler has, over this external pump? &nbsp; How is this achieved, what parts are required?</P><P>finally - is there a recommended pump type/make - like Grundfos Alpha3?, or Magna1? Etc&nbsp;</P><P>many thanks&nbsp;</P><P>&nbsp;</P> Fri, 18 Feb 2022 06:14:55 GMT https://community.viessmann.de/t5/Gas/Low-Loss-Header-second-pump-control/m-p/220338#M68315 Papawads 2022-02-18T06:14:55Z