DIY Doctor

noisy radiators

Postby johna » Mon Jan 28, 2008 10:17 pm

I have recently moved in to a new house with a radiator heating system on the first floor and underfloor heating on ground floor.

My problem is that when the heating for the first floor comes on, the noise of the radiators is intense. It is a sound of high pressure water being forced through the radiators. I have tried turning down the pump on the boiler to the minimum 1, but this still does not make a difference. I have a Grundfos pump UPS 25-80 180 and i have been told this is far too large a pump for the house and especially just the first floor. Can anyone help?? Really desperate for some quietness! :?
Rank: Labourer
Progress to next rank:
Posts: 2
Joined: Mon Jan 28, 2008 10:08 pm


Simply Build It

Postby htg engineer » Tue Jan 29, 2008 9:26 pm

The Grundfos 25-80 is designed for small commercial heating systems - so yes it probably is too powerful for your system. A 15-50/ 15-60 should be adequate for a normal domestic heating system.

Also noises when the heating is on, is probably the pump - but can also be air in the system. When you fit the new pump - vent the pump and all radiators.
htg engineer
Rank: Project Manager
Posts: 3256
Joined: Tue May 22, 2007 5:22 pm

Display posts from previous
Sort by
Order by

  • DIY How to Project Guides
  • DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!

  • Related Topics