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I have been using Grundfos pumps for 30 years with good results. When I installed this pump on my outdoor water stove, it sounded like there was a bad bushing in it. Had a terrible squalling noise. After running for 10 min. the noise stopped. It is pumping ok but occasionally makes this noise. Hope the noise stops because the pump is a tough one to change and don't want to change it until I have to.
Verified purchase: Yes | Condition: New
Quiet operation , built well and proven I do HVAC and have used these pumps for years
Verified purchase: Yes | Condition: Pre-owned
Highly recommended! Easy to install for a non-professional. Once installed, make sure to blead the line to purge any air that was introduced into the system.
Verified purchase: Yes | Condition: New
the pump made noises at medium and high speed dos not do it at low speed,maybe is refurish not new
Verified purchase: Yes | Condition: New
helped to add another zone to boiler
Verified purchase: Yes | Condition: New
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