Chriss Posted November 26 Share Posted November 26 (edited) Hi I didn’t run my circulation pump since last winter as it is only used with the ASHP and that is only used to heat the underfloor-heating. I didn’t realise it was at risk of rusting and seizing up which it has done. I had another circulation pump in the house so switched them over but it clearly isn’t strong enough and the floors aren’t heating up anywhere near as well and I’m unable to adjust flow rates properly. The original pump came as part of a kit, the problem is if I want to buy the exact same one it’s pretty expensive. I have attached pictures of the original Grundfos pump that has packed in, the pump currently on the manifold and a pump I was thinking of buying, my question is the pump I’m thinking about buying ok and would work better. Many thanks Chris Edited November 26 by Chriss Link to comment Share on other sites More sharing options...
JohnMo Posted November 26 Share Posted November 26 11 minutes ago, Chriss said: circulation pump since last winter as it is only used with the ASHP Couple of concerns pop up If your pump is rusted you have a big issue with circulation water. It should be corrosion free environment. So if your on glycol it likely it's started to breakdown, if fresh water with chemicals that needs attention... Plenty of pumps out there, just a matter of getting flow and head rates matched. Or look to delete the pump mixer altogether. Link to comment Share on other sites More sharing options...
Chriss Posted November 26 Author Share Posted November 26 Cheers I’ll look into that. Do you think the pump I’ve put on isn’t strong enough and the one I’m thinking of buying would be okay and better? Link to comment Share on other sites More sharing options...
JohnMo Posted November 26 Share Posted November 26 You don't need a 25-80-130, if the one you had failed is only a 25-70-130. UFH doesn't need much head but you may need plenty of flow depending on how many looks you have. Size is broken down something like 25 is the nominal size 50, 60 70 , 80 etc is metres of head developed at a closed discharge. 130 is distance between flange faces. You took out a 70m head pump installed a 60m head pump and are now proposing an 80m head pump. Just get a 70m pump. Link to comment Share on other sites More sharing options...
Chriss Posted November 26 Author Share Posted November 26 This is my problem, I don’t understand what the 25 nominal size means, If I look for a 25 70 130 it’s much more expensive than say a 25 80 130. I can find a 40 70 130 at a good price but is a 40 not good, does it need to be 25? Excuse my ignorance it’s just very hard to find the information on that. Even my plumber friend was unable to help me. Link to comment Share on other sites More sharing options...
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