Recent content by ChrisHS

The Grundfoss Alpha 2's are not self venting unless you get the A version that needs to be mounted with vertical pipework, so vent is upwards. The non A type needs to just have the pump horizontal so bubbles can get back out the exhaust & not fill the pump. I had found the supplied...

The pump was mounted with the bleed screw up. The manuals I've looked at have this as a 'don't fit it that way'. There was a bit of air I removed once a month but the previous owners had probably never bothered. Not a sealed system so air slowly gets in through feed tank as water expands &...

>You should have water flushed the system first until clear and then added about 1/2 to 1/3 of a tub at a time reducing as it neared total cleanliness. Yep, followed the instructions on the pack. I added 1/4 at a time disolved in a bucket of CH water each time to feed tank. Probably added...

Hi, I'd like to run this past people with experience before I return a pump. My old pump was sticking so I've replaced it. It might be older than me as it some standard for 1971 on it Grundfoss 18-60 (yes eighteen). Gravity hot water, pumped CH, Feed tank in loft, pump on the cold CH...