Recent content by Glennington

Ok, I will look at replacing for a single NRV (thinking about what parts I could use so I could easily replace it back to double NRV if needed). The pump impeller looked clean however, I didn't scrutinise the vanes - perhaps I should check again.

Thanks for the help John, really appreciate the replies! I do not see any other NRVs to compare with unfortunately. Looks like there maybe two options for me here then: - Install a single NRV and fit a spool to make it fit in the 105mm gap from the DCV - Replace the Grundfos Pump head...

Also, you mention about the 15mm pipe downstream of the DCV - this is not connected (just looks like it on the photo!) It's the cold water inlet and separate.

Hi John, Cheers, thanks for this. Just to let you know the boiler is Warmflow Kabin-Pak 70 HE (Oil Fired). Is there such thing as a fake Grundfos? To me it looks genuine and yes, it does look newer than the other pump head (DHW pump). However It hasn't been replaced while I have been here (in...

Hi John, Good question if it really needs to be a double! I'm guessing a single is prone to failing? I've been living at this property for only 2 years and my guess it has always been but I have no idea! Do you know if it is possible to get a 22mm single non return valve with the same length...

Hi John, Thanks for the reply. It is a combi boiler. The non-return valve is positioned on the heating flow circuit just before it enters the house. I believe it is to prevent back flow due to gravity from the radiators into the central heating pump? Regarding the pump below the central...

Hi All, So, I am currently having an issue with my central heating provided by my combi-boiler. Every time the central heating is called and the central heating pump turns on, the flow can't get passed the 22mm double non-return valve (labelled by red arrow in attached photo - "Top of Boiler...