Grundfos Alpha 1 pump

[Garyf123]

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.

[marshian]

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

[Garyf123]

Thank you!

[John Carroll]

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

 

[Garyf123]

Brilliant, thank you!