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Thanks everyone for jumping in. If it isn't clear already, my knowledge of plumbing is pretty poor. Following some comments above I did some tests and the buzzing is indeed caused by a toilet being flushed. In the roof is a system boiler, a hot water tank, two expansion tanks, a grundfos pump...

Pretty sure it's when something's drawing water. Usually happens when someone flushes a toilet but can't be 100% sure.

I've been on constant speed for a while and the intermittent buzzing is still happening, so maybe it's got nothing to do with the Grundfos. Is there something else that would cause the noise? Here’s a lousy video of me trying to catch it before it stops. It’s louder than the video suggests.

Ha! The house used to be two flats. It’s how the house came, aside from the instant hot water pump which I got installed a couple of years ago.

Aaargh! There’s a buzzing sound coming from somewhere in my plumbing and I can’t identify it. It happens for between 5 seconds and 30 seconds and is noticeable most in our en suite. I have three Grundfos pumps for upstairs heating, downstairs heating and underfloor heating. I also have a...

I recently had central heating installed. A Megaflo tank and a Vaillant Ecoplus 630 boiler. The house is warm and I have hot water, so there is no emergency. I have nagging feeling it's not working 100%. 1. The pressure seems low. It's at 1.7 bar. I had to bleed the towel rail (for the second...

That was too easy. I should have pixellated some of that out. Nevertheless... RESPECT! Leonardo, exclusively at CP Hart seem to be them.

I stayed in a nice hotel yesterday (Soho Hotel). The Attack the Block movie after-party seemed to be happening there. I wasn't invited. Anyway, I digress... I liked the fixtures and fittings. The electric sockets etc seemed to be Wandsworth. Loo was Duravit. Flush was perhaps Grohe? Wasn't...