Garyf123 Posted Monday at 19:16 Share Posted Monday at 19:16 Hi, Elderly neighbors heating/hot water went off yesterday with HD fault on boiler and E1 fault on Grundfos Alpha pump. I removed pump and impeller was totally seized (only 2 years old). I managed to free it off and replaced it and all was well for about 4 hours when temperature started dropping and E1 appeared on pump again. I called local merchant for a replacement but they do not stock the Alphas as all the tradesmen who buy from them will not use them and go for the older mechanical models! Can anybody confirm which pump (old style) will be a straight swap as i believe the distance between the flanges is 130mm? Many thanks in advance, Gary. Link to comment Share on other sites More sharing options...
marshian Posted Monday at 21:10 Share Posted Monday at 21:10 1 hour ago, Garyf123 said: Hi, Elderly neighbors heating/hot water went off yesterday with HD fault on boiler and E1 fault on Grundfos Alpha pump. I removed pump and impeller was totally seized (only 2 years old). I managed to free it off and replaced it and all was well for about 4 hours when temperature started dropping and E1 appeared on pump again. I called local merchant for a replacement but they do not stock the Alphas as all the tradesmen who buy from them will not use them and go for the older mechanical models! Can anybody confirm which pump (old style) will be a straight swap as i believe the distance between the flanges is 130mm? Many thanks in advance, Gary. Several manufacturers do 130mm copies of the old style grundfos pumps Willo, Trident, Onyx - you can even get a BNIB Grundfos one it you search hard enough. I went for a DAB which has a little more functionality - recommended by my gas engineer because he won't fit the Alphas any more Link to comment Share on other sites More sharing options...
Garyf123 Posted Monday at 22:03 Author Share Posted Monday at 22:03 Thank you! Link to comment Share on other sites More sharing options...
John Carroll Posted Monday at 23:21 Share Posted Monday at 23:21 I have a 6M Wilo Yonos Pico, which, apart from the traditional 3 speed settings, also has CP (constant pressure and PP (proportional pressure) modes, both of which can be incrementally changed in 0.1M steps to give any required head, this pump also displays (like the DAB Evosta 3), the pump flowrate in m3/hr and the power in watts Link to comment Share on other sites More sharing options...
Garyf123 Posted 21 hours ago Author Share Posted 21 hours ago Brilliant, thank you! Link to comment Share on other sites More sharing options...
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